diff --git a/Cargo.toml b/Cargo.toml
index 3e41385..22c8dac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,4 +1,5 @@
 [workspace]
+edition = "2021"
 
 members = [
     "pkmn_lib_interface",
@@ -9,4 +10,5 @@ members = [
 # Tell `rustc` to optimize for small code size.
 opt-level = "s"
 lto = false
-debug-assertions = true
\ No newline at end of file
+debug-assertions = true
+
diff --git a/gen_7_scripts/Cargo.toml b/gen_7_scripts/Cargo.toml
index 63902a8..b6544d6 100644
--- a/gen_7_scripts/Cargo.toml
+++ b/gen_7_scripts/Cargo.toml
@@ -2,10 +2,13 @@
 name = "gen7_scripts"
 version = "0.1.0"
 authors = ["Deukhoofd <Deukhoofd@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 [lib]
 crate-type = ["cdylib"]
 
 [dependencies]
-pkmn_lib_interface = { path = "../pkmn_lib_interface" }
\ No newline at end of file
+pkmn_lib_interface = { path = "../pkmn_lib_interface" }
+
+[dev-dependencies]
+pkmn_lib_interface = { path = "../pkmn_lib_interface", features = ["mock_data"] }
diff --git a/gen_7_scripts/src/lib.rs b/gen_7_scripts/src/lib.rs
index 9d17fdd..10d6dc3 100644
--- a/gen_7_scripts/src/lib.rs
+++ b/gen_7_scripts/src/lib.rs
@@ -1,7 +1,7 @@
 #![feature(inline_const)]
 #![feature(inline_const_pat)]
 #![feature(wasm_abi)]
-#![no_std]
+#![cfg_attr(not(test), no_std)]
 #![allow(incomplete_features)]
 
 extern crate alloc;
@@ -15,6 +15,7 @@ pub mod registered_scripts;
 pub mod test_script;
 
 #[no_mangle]
+#[cfg(not(test))]
 extern "wasm" fn _init() {
     set_load_script_fn(Box::new(registered_scripts::get_script));
 }
diff --git a/gen_7_scripts/src/registered_scripts.rs b/gen_7_scripts/src/registered_scripts.rs
index 9b01fa7..1f17759 100644
--- a/gen_7_scripts/src/registered_scripts.rs
+++ b/gen_7_scripts/src/registered_scripts.rs
@@ -1,6 +1,6 @@
 use crate::test_script::TestScript;
 use alloc::boxed::Box;
-use pkmn_lib_interface::app_interface::{get_hash, StringKey};
+use pkmn_lib_interface::app_interface::{get_hash_const, StringKey};
 use pkmn_lib_interface::handling::{Script, ScriptCategory};
 
 macro_rules! resolve_match {
@@ -12,7 +12,7 @@ macro_rules! resolve_match {
     ) => (
         match $mid {
             $(
-                const { get_hash($key) } => {
+                const { get_hash_const($key) } => {
                     return Some(Box::new($script {}))
                 }
             )*
diff --git a/gen_7_scripts/src/test_script.rs b/gen_7_scripts/src/test_script.rs
index 583e854..61e10f2 100644
--- a/gen_7_scripts/src/test_script.rs
+++ b/gen_7_scripts/src/test_script.rs
@@ -1,6 +1,6 @@
 use pkmn_lib_interface::app_interface::list::ImmutableList;
 use pkmn_lib_interface::app_interface::{
-    get_hash, DamageSource, DataLibrary, DynamicLibrary, EffectParameter, TurnChoice,
+    get_hash_const, DamageSource, DataLibrary, DynamicLibrary, EffectParameter, TurnChoice,
 };
 use pkmn_lib_interface::dbg;
 use pkmn_lib_interface::handling::{Script, ScriptCapabilities};
@@ -31,14 +31,13 @@ impl Script for TestScript {
     ) {
         let l = library.data_library();
         let ml = l.move_library();
-        let m = ml.get_by_hash(const { get_hash(b"tackle") }).unwrap();
+        let m = ml.get_by_hash(const { get_hash_const(b"tackle") }).unwrap();
         dbg!("found move!");
         dbg!("{:?} has {} base power", m.name().str(), m.base_power());
         dbg!(
             "Found a parameter with value: {}",
             parameters.unwrap().get(0).unwrap()
         );
-        if m.has_flag(b"foo") {}
     }
 
     fn on_before_turn(&self, choice: TurnChoice) {
@@ -46,7 +45,7 @@ impl Script for TestScript {
             "On before turn for user: {}",
             choice.user().species().name()
         );
-        choice.user().damage(50, DamageSource::Misc);
+        // choice.user().damage(50, DamageSource::Misc);
         if let TurnChoice::Move(d) = choice {
             dbg!(
                 "On before turn for move choice: {}",
@@ -55,3 +54,49 @@ impl Script for TestScript {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use pkmn_lib_interface::app_interface::move_library::MoveLibrary;
+    use pkmn_lib_interface::app_interface::species_library::SpeciesLibrary;
+    use pkmn_lib_interface::app_interface::type_library::TypeLibrary;
+    use pkmn_lib_interface::app_interface::{
+        Item, ItemLibrary, LibrarySettings, MoveCategory, MoveData, MoveTarget, StaticData,
+    };
+    use pkmn_lib_interface::handling::Script;
+
+    #[test]
+    fn test_foo() {
+        let item = Item::mock();
+        assert_eq!(item.name().str().to_str().unwrap(), "test");
+
+        let script = TestScript::new();
+        assert_eq!(script.get_name(), "TestScript");
+
+        let lib = DynamicLibrary::new(StaticData::mock(
+            MoveLibrary::mock(),
+            ItemLibrary::mock(),
+            SpeciesLibrary::mock(),
+            TypeLibrary::mock(),
+            LibrarySettings::mock(100),
+        ));
+        lib.data_library().move_library().insert(
+            const { get_hash_const(b"tackle") },
+            MoveData::mock(
+                "tackle",
+                0,
+                MoveCategory::Physical,
+                60,
+                100,
+                10,
+                MoveTarget::Adjacent,
+                0,
+            ),
+        );
+        script.on_initialize(
+            &lib,
+            Some(ImmutableList::mock((&[EffectParameter::Int(100)]).to_vec())),
+        );
+    }
+}
diff --git a/pkmn_lib_interface/Cargo.toml b/pkmn_lib_interface/Cargo.toml
index 70c62e2..d6e1cde 100644
--- a/pkmn_lib_interface/Cargo.toml
+++ b/pkmn_lib_interface/Cargo.toml
@@ -2,7 +2,10 @@
 name = "pkmn_lib_interface"
 version = "0.1.0"
 authors = ["Deukhoofd <Deukhoofd@gmail.com>"]
-edition = "2018"
+edition = "2021"
+
+[features]
+mock_data = []
 
 [dependencies]
 wee_alloc = "0.4.5"
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/battle.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/battle.rs
index 256daa3..08c4047 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/battle.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/battle.rs
@@ -21,6 +21,7 @@ pub struct Battle {
 }
 
 impl Battle {
+    #[cfg(not(feature = "mock_data"))]
     pub fn new(reference: ExternRef<Battle>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(BattleInner {
@@ -39,6 +40,7 @@ impl Battle {
         pub fn sides(&self) -> ImmutableList<BattleSide>;
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_pokemon(&self, side: u8, index: u8) -> Option<Pokemon> {
         unsafe { battle_get_pokemon(self.inner.reference, side, index).get_value() }
     }
@@ -57,12 +59,14 @@ wasm_value_getters! {
 
 crate::handling::cacheable::cacheable!(Battle);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for Battle {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn battle_get_library(r: ExternRef<Battle>) -> ExternRef<DynamicLibrary>;
     fn battle_get_parties(r: ExternRef<Battle>) -> VecExternRef<BattleParty>;
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/battle_party.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/battle_party.rs
index 57eec8d..7ef96e0 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/battle_party.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/battle_party.rs
@@ -15,6 +15,7 @@ pub struct BattleParty {
 }
 
 impl BattleParty {
+    #[cfg(not(feature = "mock_data"))]
     pub fn new(reference: ExternRef<BattleParty>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(BattlePartyInner {
@@ -31,12 +32,15 @@ impl BattleParty {
 
 crate::handling::cacheable::cacheable!(BattleParty);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for BattleParty {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn battle_party_get_party(r: ExternRef<BattleParty>) -> ExternRef<Party>;
 }
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/battle_random.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/battle_random.rs
index 5ad8636..9de7142 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/battle_random.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/battle_random.rs
@@ -6,12 +6,15 @@ pub struct BattleRandom {
 }
 
 impl BattleRandom {
+    #[cfg(not(feature = "mock_data"))]
     pub fn get(&self) -> i32 {
         unsafe { battle_random_get(self.reference) }
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_max(&self, max: i32) -> i32 {
         unsafe { battle_random_get_max(self.reference, max) }
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_between(&self, min: i32, max: i32) -> i32 {
         unsafe { battle_random_get_between(self.reference, min, max) }
     }
@@ -24,6 +27,7 @@ impl ExternalReferenceType for BattleRandom {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn battle_random_get(r: ExternRef<BattleRandom>) -> i32;
     fn battle_random_get_max(r: ExternRef<BattleRandom>, max: i32) -> i32;
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/battle_side.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/battle_side.rs
index 1176e57..f6175e1 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/battle_side.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/battle_side.rs
@@ -19,6 +19,7 @@ pub struct BattleSide {
 }
 
 impl BattleSide {
+    #[cfg(not(feature = "mock_data"))]
     pub fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(BattleSideInner {
@@ -36,6 +37,7 @@ impl BattleSide {
         pub fn battle(&self) -> Battle;
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_pokemon(&self, index: usize) -> Option<Pokemon> {
         unsafe { battleside_get_pokemon(self.inner.reference, index).get_value() }
     }
@@ -49,12 +51,14 @@ wasm_value_getters! {
 
 crate::handling::cacheable::cacheable!(BattleSide);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for BattleSide {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn battleside_get_side_index(r: ExternRef<BattleSide>) -> u8;
     fn battleside_get_pokemon_per_side(r: ExternRef<BattleSide>) -> u8;
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/dynamic_library.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/dynamic_library.rs
index 9a0ae01..1f1fbb5 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/dynamic_library.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/dynamic_library.rs
@@ -17,6 +17,7 @@ pub struct DynamicLibrary {
 crate::handling::cacheable::cacheable!(DynamicLibrary);
 
 impl DynamicLibrary {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
         Self::from_ref(ptr, &|ptr| Self {
             inner: Rc::new(DynamicLibraryInner {
@@ -28,17 +29,29 @@ impl DynamicLibrary {
         })
     }
 
+    #[cfg(feature = "mock_data")]
+    pub fn new(data: StaticData) -> Self {
+        Self {
+            inner: Rc::new(DynamicLibraryInner {
+                ptr: ExternRef::mock(),
+                static_data: data.into(),
+            }),
+        }
+    }
+
     pub fn data_library(&self) -> StaticData {
         self.inner.static_data.value()
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for DynamicLibrary {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         DynamicLibrary::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn dynamic_library_get_static_data(ptr: ExternRef<DynamicLibrary>) -> ExternRef<StaticData>;
 }
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/learned_move.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/learned_move.rs
index ad50597..5d32b49 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/learned_move.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/learned_move.rs
@@ -30,6 +30,7 @@ pub struct LearnedMove {
 
 crate::handling::cacheable::cacheable!(LearnedMove);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for LearnedMove {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
@@ -37,6 +38,7 @@ impl ExternalReferenceType for LearnedMove {
 }
 
 impl LearnedMove {
+    #[cfg(not(feature = "mock_data"))]
     pub fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(LearnedMoveInner {
@@ -54,12 +56,14 @@ impl LearnedMove {
         pub fn learn_method(&self) -> MoveLearnMethod;
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn restore_all_uses(&self) {
         unsafe {
             learned_move_restore_all_uses(self.inner.reference);
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn restore_uses(&self, uses: u8) {
         unsafe {
             learned_move_restore_uses(self.inner.reference, uses);
@@ -73,6 +77,7 @@ wasm_value_getters! {
     pub fn remaining_pp(&self) -> u8;
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn learned_move_get_move_data(r: ExternRef<LearnedMove>) -> ExternRef<MoveData>;
     fn learned_move_get_learn_method(r: ExternRef<LearnedMove>) -> MoveLearnMethod;
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/party.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/party.rs
index 5ac5b12..abd50ea 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/party.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/party.rs
@@ -11,6 +11,7 @@ impl Party {
         Self { reference }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_pokemon(&self, index: usize) -> Option<Pokemon> {
         unsafe { party_get_pokemon(self.reference, index).get_value() }
     }
@@ -22,6 +23,7 @@ impl ExternalReferenceType for Party {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn party_get_pokemon(r: ExternRef<Party>, index: usize) -> ExternRef<Pokemon>;
 }
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs
index 0b7b536..615c25e 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/pokemon.rs
@@ -34,6 +34,7 @@ pub struct Pokemon {
 }
 
 impl Pokemon {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(PokemonInner {
@@ -69,33 +70,41 @@ impl Pokemon {
         pub fn effort_values(&self) -> ClampedStatisticSet<u8>;
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_held_item(&self, name: &str) -> bool {
         let cstr = CString::new(name).unwrap();
         unsafe { pokemon_has_held_item(self.inner.reference, cstr.as_ptr()) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn set_held_item(&self, item: &Item) -> Option<Item> {
         unsafe { pokemon_set_held_item(self.inner.reference, item.reference()).get_value() }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn remove_held_item(&self) -> Option<Item> {
         unsafe { pokemon_remove_held_item(self.inner.reference).get_value() }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn consume_held_item(&self) -> bool {
         unsafe { pokemon_consume_held_item(self.inner.reference) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn max_health(&self) -> u32 {
         self.boosted_stats().hp()
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_type(&self, index: usize) -> u8 {
         unsafe { pokemon_get_type(self.inner.reference, index) }
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_type(&self, type_identifier: u8) -> bool {
         unsafe { pokemon_has_type(self.inner.reference, type_identifier) }
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_type_by_name(&self, type_name: &str) -> bool {
         let type_identifier = self
             .library()
@@ -107,9 +116,12 @@ impl Pokemon {
         }
         false
     }
+
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_learned_move(&self, index: usize) -> Option<LearnedMove> {
         unsafe { pokemon_get_learned_move(self.inner.reference, index).get_value() }
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn change_stat_boost(
         &self,
         stat: Statistic,
@@ -121,16 +133,19 @@ impl Pokemon {
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn ability_script(&self) -> Option<&Box<dyn Script>> {
         unsafe { pokemon_get_ability_script(self.inner.reference).as_ref() }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn change_species(&self, species: Species, form: Form) {
         unsafe {
             pokemon_change_species(self.inner.reference, species.reference(), form.reference());
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn change_form(&self, form: Form) {
         unsafe {
             pokemon_change_form(self.inner.reference, form.reference());
@@ -141,15 +156,18 @@ impl Pokemon {
         self.current_health() == 0
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn damage(&self, damage: u32, source: DamageSource) {
         unsafe { pokemon_damage(self.inner.reference, damage, source) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn heal(&self, amount: u32, allow_revive: bool) -> bool {
         unsafe { pokemon_heal(self.inner.reference, amount, allow_revive) }
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 wasm_reference_getters! {
     Pokemon,
     pub fn species(&self) -> Species;
@@ -158,6 +176,7 @@ wasm_reference_getters! {
     pub fn nature(&self) -> Nature;
 }
 
+#[cfg(not(feature = "mock_data"))]
 wasm_optional_reference_getters! {
     Pokemon,
     pub fn display_species(&self) -> Option<Species>;
@@ -166,6 +185,7 @@ wasm_optional_reference_getters! {
     pub fn battle(&self) -> Option<Battle>;
 }
 
+#[cfg(not(feature = "mock_data"))]
 wasm_value_getters! {
     Pokemon,
     pub fn level(&self) -> LevelInt;
@@ -198,12 +218,14 @@ pub enum DamageSource {
 
 crate::handling::cacheable::cacheable!(Pokemon);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for Pokemon {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn pokemon_get_library(r: ExternRef<Pokemon>) -> ExternRef<DynamicLibrary>;
     fn pokemon_get_flat_stats(r: ExternRef<Pokemon>) -> ExternRef<StatisticSet<u32>>;
@@ -234,3 +256,13 @@ extern "wasm" {
     fn pokemon_damage(r: ExternRef<Pokemon>, damage: u32, source: DamageSource);
     fn pokemon_heal(r: ExternRef<Pokemon>, amount: u32, allow_revive: bool) -> bool;
 }
+
+#[cfg(feature = "mock_data")]
+impl Pokemon {
+    pub fn current_health(&self) -> u32 {
+        unimplemented!()
+    }
+    pub fn species(&self) -> Species {
+        unimplemented!()
+    }
+}
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/statistic_set.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/statistic_set.rs
index cba199d..f745fd3 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/statistic_set.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/statistic_set.rs
@@ -28,25 +28,32 @@ where
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn hp(&self) -> T {
         self.get_stat(Statistic::HP)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn attack(&self) -> T {
         self.get_stat(Statistic::Attack)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn defense(&self) -> T {
         self.get_stat(Statistic::Defense)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn special_attack(&self) -> T {
         self.get_stat(Statistic::SpecialAttack)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn special_defense(&self) -> T {
         self.get_stat(Statistic::SpecialDefense)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn speed(&self) -> T {
         self.get_stat(Statistic::Speed)
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_stat(&self, stat: Statistic) -> T {
         unsafe {
             statistic_set_get(self.reference.cast(), stat)
@@ -55,15 +62,18 @@ where
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn set_stat(&self, stat: Statistic, value: T) {
         unsafe { statistic_set_set(self.reference.cast(), stat, value.try_into().unwrap()) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn increase_stat(&self, stat: Statistic, value: T) {
         unsafe {
             statistic_set_increase_stat(self.reference.cast(), stat, value.try_into().unwrap())
         }
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn decrease_stat(&self, stat: Statistic, value: T) {
         unsafe {
             statistic_set_decrease_stat(self.reference.cast(), stat, value.try_into().unwrap())
@@ -106,25 +116,33 @@ where
             _p: Default::default(),
         }
     }
+
+    #[cfg(not(feature = "mock_data"))]
     pub fn hp(&self) -> T {
         self.get_stat(Statistic::HP)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn attack(&self) -> T {
         self.get_stat(Statistic::Attack)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn defense(&self) -> T {
         self.get_stat(Statistic::Defense)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn special_attack(&self) -> T {
         self.get_stat(Statistic::SpecialAttack)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn special_defense(&self) -> T {
         self.get_stat(Statistic::SpecialDefense)
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn speed(&self) -> T {
         self.get_stat(Statistic::Speed)
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_stat(&self, stat: Statistic) -> T {
         unsafe {
             clamped_statistic_set_get(self.reference.cast(), stat)
@@ -133,10 +151,12 @@ where
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn set_stat(&self, stat: Statistic, value: T) {
         unsafe { clamped_statistic_set_set(self.reference.cast(), stat, value.try_into().unwrap()) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn increase_stat(&self, stat: Statistic, value: T) -> bool {
         unsafe {
             clamped_statistic_set_increase_stat(
@@ -146,6 +166,7 @@ where
             )
         }
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn decrease_stat(&self, stat: Statistic, value: T) -> bool {
         unsafe {
             clamped_statistic_set_decrease_stat(
@@ -169,6 +190,7 @@ where
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn statistic_set_get(r: ExternRef<StatisticSet<i64>>, stat: Statistic) -> i64;
     fn statistic_set_set(r: ExternRef<StatisticSet<i64>>, stat: Statistic, value: i64);
diff --git a/pkmn_lib_interface/src/app_interface/dynamic_data/turn_choices.rs b/pkmn_lib_interface/src/app_interface/dynamic_data/turn_choices.rs
index 522f8b7..f5a1e3c 100644
--- a/pkmn_lib_interface/src/app_interface/dynamic_data/turn_choices.rs
+++ b/pkmn_lib_interface/src/app_interface/dynamic_data/turn_choices.rs
@@ -1,7 +1,10 @@
 use crate::app_interface::{LearnedMove, Pokemon};
 use crate::handling::cached_value::CachedValue;
 use crate::handling::temporary::Temporary;
-use crate::{cached_value, wasm_value_getters, ExternRef, ExternalReferenceType, Script};
+use crate::ExternRef;
+#[cfg(not(feature = "mock_data"))]
+use crate::{cached_value, wasm_value_getters, ExternalReferenceType, Script};
+#[cfg(not(feature = "mock_data"))]
 use alloc::boxed::Box;
 use alloc::rc::Rc;
 
@@ -47,14 +50,17 @@ impl TurnChoice {
         self.base().user.value()
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn speed(&self) -> u32 {
         unsafe { turn_choice_get_speed(self.base().reference) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_failed(&self) -> bool {
         unsafe { turn_choice_has_failed(self.base().reference) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn fail(&self) {
         unsafe { turn_choice_fail(self.base().reference) }
     }
@@ -70,15 +76,18 @@ impl MoveTurnChoiceData {
     pub fn target_index(&self) -> u8 {
         self.temp.value().inner.target_index.value()
     }
+    #[cfg(not(feature = "mock_data"))]
     pub fn priority(&self) -> i8 {
         unsafe { turn_choice_move_priority(self.temp.value().inner.base.reference.cast()) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn move_script(&self) -> Option<&Box<dyn Script>> {
         unsafe { turn_choice_move_script(self.temp.value().inner.base.reference.cast()).as_ref() }
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for TurnChoice {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         let kind = unsafe { turn_choice_get_kind(reference) };
@@ -91,6 +100,7 @@ impl ExternalReferenceType for TurnChoice {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for MoveTurnChoiceDataTemporary {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self {
@@ -113,6 +123,7 @@ impl ExternalReferenceType for MoveTurnChoiceDataTemporary {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn turn_choice_get_kind(r: ExternRef<TurnChoice>) -> u8;
     fn turn_choice_get_user(r: ExternRef<TurnChoice>) -> ExternRef<Pokemon>;
@@ -128,6 +139,7 @@ extern "wasm" {
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 unsafe extern "wasm" fn turn_choice_mark_deleted(r: ExternRef<TurnChoice>, kind: u8) {
     match kind {
         0 => Temporary::<MoveTurnChoiceDataTemporary>::mark_as_deleted(r.cast()),
diff --git a/pkmn_lib_interface/src/app_interface/list.rs b/pkmn_lib_interface/src/app_interface/list.rs
index 54fd971..3bd6e87 100644
--- a/pkmn_lib_interface/src/app_interface/list.rs
+++ b/pkmn_lib_interface/src/app_interface/list.rs
@@ -1,9 +1,11 @@
 use crate::{ExternalReferenceType, VecExternRef};
 use alloc::boxed::Box;
 use alloc::collections::BTreeMap;
+use alloc::rc::Rc;
 use alloc::vec::Vec;
 use core::marker::PhantomData;
 
+#[cfg(not(feature = "mock_data"))]
 struct ImmutableListInner<T: Clone> {
     extern_ref: VecExternRef<T>,
     resource_type: PhantomData<T>,
@@ -11,6 +13,7 @@ struct ImmutableListInner<T: Clone> {
 }
 
 #[derive(Clone)]
+#[cfg(not(feature = "mock_data"))]
 pub struct ImmutableList<T>
 where
     T: Clone,
@@ -19,6 +22,7 @@ where
     inner: *const ImmutableListInner<T>,
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl<T> ImmutableList<T>
 where
     T: Clone,
@@ -71,4 +75,31 @@ where
     }
 }
 
+#[cfg(feature = "mock_data")]
+pub struct ImmutableListInner<T> {
+    values: Vec<T>,
+}
+
+#[cfg(feature = "mock_data")]
+#[derive(Clone)]
+pub struct ImmutableList<T> {
+    inner: Rc<ImmutableListInner<T>>,
+}
+
+#[cfg(feature = "mock_data")]
+impl<T> ImmutableList<T>
+where
+    T: Clone,
+{
+    pub fn mock(values: Vec<T>) -> Self {
+        Self {
+            inner: Rc::new(ImmutableListInner { values }),
+        }
+    }
+
+    pub fn get(&self, index: u32) -> Option<T> {
+        self.inner.values.get(index as usize).cloned()
+    }
+}
+
 static mut CACHE: BTreeMap<u32, *const u8> = BTreeMap::new();
diff --git a/pkmn_lib_interface/src/app_interface/mod.rs b/pkmn_lib_interface/src/app_interface/mod.rs
index 9f386cd..9106659 100644
--- a/pkmn_lib_interface/src/app_interface/mod.rs
+++ b/pkmn_lib_interface/src/app_interface/mod.rs
@@ -5,5 +5,5 @@ pub mod string_key;
 
 pub use dynamic_data::*;
 pub use static_data::*;
-pub use string_key::get_hash;
+pub use string_key::get_hash_const;
 pub use string_key::StringKey;
diff --git a/pkmn_lib_interface/src/app_interface/static_data/ability.rs b/pkmn_lib_interface/src/app_interface/static_data/ability.rs
index 85db3ce..3b6baa2 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/ability.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/ability.rs
@@ -19,6 +19,7 @@ pub struct Ability {
 }
 
 impl Ability {
+    #[cfg(not(feature = "mock_data"))]
     pub fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(AbilityInner {
@@ -38,6 +39,7 @@ impl Ability {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for Ability {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
@@ -53,6 +55,7 @@ pub struct AbilityIndex {
     pub index: u8,
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn ability_get_name(r: ExternRef<Ability>) -> ExternRef<StringKey>;
     fn ability_get_effect(r: ExternRef<Ability>) -> ExternRef<StringKey>;
diff --git a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/item_library.rs b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/item_library.rs
index 3566e33..da4eb91 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/item_library.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/item_library.rs
@@ -15,6 +15,7 @@ pub struct ItemLibrary {
 }
 
 impl ItemLibrary {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
         Self {
             inner: Rc::new(ItemLibraryInner {
@@ -34,10 +35,12 @@ impl DataLibrary<Item> for ItemLibrary {
         self.inner.ptr
     }
 
+    #[cfg(not(feature = "mock_data"))]
     fn _get_ref_by_name(ptr: ExternRef<Self>, name: ExternRef<StringKey>) -> ExternRef<Item> {
         unsafe { move_library_get_move(ptr, name) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     fn _get_ref_by_hash(ptr: ExternRef<Self>, hash: u32) -> ExternRef<Item> {
         unsafe { move_library_get_move_by_hash(ptr, hash) }
     }
@@ -45,12 +48,14 @@ impl DataLibrary<Item> for ItemLibrary {
 
 crate::handling::cacheable::cacheable!(ItemLibrary);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for ItemLibrary {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn move_library_get_move(
         ptr: ExternRef<ItemLibrary>,
@@ -58,3 +63,15 @@ extern "wasm" {
     ) -> ExternRef<Item>;
     fn move_library_get_move_by_hash(ptr: ExternRef<ItemLibrary>, hash: u32) -> ExternRef<Item>;
 }
+
+#[cfg(feature = "mock_data")]
+impl ItemLibrary {
+    pub fn mock() -> Self {
+        Self {
+            inner: Rc::new(ItemLibraryInner {
+                ptr: ExternRef::mock(),
+                cache: Default::default(),
+            }),
+        }
+    }
+}
diff --git a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/mod.rs b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/mod.rs
index 6aa6f3f..94c8791 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/mod.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/mod.rs
@@ -23,6 +23,7 @@ struct StaticDataInner {
     item_library: CachedValue<ItemLibrary>,
     species_library: CachedValue<SpeciesLibrary>,
     type_library: CachedValue<TypeLibrary>,
+    settings: CachedValue<LibrarySettings>,
 }
 
 #[derive(Clone)]
@@ -31,6 +32,7 @@ pub struct StaticData {
 }
 
 impl StaticData {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(reference: ExternRef<StaticData>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(StaticDataInner {
@@ -53,6 +55,26 @@ impl StaticData {
         })
     }
 
+    #[cfg(feature = "mock_data")]
+    pub fn mock(
+        moves: MoveLibrary,
+        items: ItemLibrary,
+        species: SpeciesLibrary,
+        types: TypeLibrary,
+        settings: LibrarySettings,
+    ) -> Self {
+        Self {
+            inner: Rc::new(StaticDataInner {
+                reference: ExternRef::mock(),
+                move_library: moves.into(),
+                item_library: items.into(),
+                species_library: species.into(),
+                type_library: types.into(),
+                settings: settings.into(),
+            }),
+        }
+    }
+
     cached_value_getters! {
         pub fn move_library(&self) -> MoveLibrary;
         pub fn item_library(&self) -> ItemLibrary;
@@ -63,9 +85,10 @@ impl StaticData {
 
 crate::handling::cacheable::cacheable!(StaticData);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for StaticData {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
-        StaticData::new(reference)
+        StaticData::mock(reference)
     }
 }
 
@@ -79,6 +102,7 @@ pub struct LibrarySettings {
 }
 
 impl LibrarySettings {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(ptr: ExternRef<LibrarySettings>) -> Self {
         Self {
             inner: Rc::new(LibrarySettingsInner {
@@ -87,11 +111,21 @@ impl LibrarySettings {
         }
     }
 
+    #[cfg(feature = "mock_data")]
+    pub fn mock(maximum_level: LevelInt) -> Self {
+        Self {
+            inner: Rc::new(LibrarySettingsInner {
+                maximum_level: maximum_level.into(),
+            }),
+        }
+    }
+
     cached_value_getters! {
         pub fn maximum_level(&self) -> LevelInt;
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn static_data_get_move_library(ptr: ExternRef<StaticData>) -> ExternRef<MoveLibrary>;
     fn static_data_get_item_library(ptr: ExternRef<StaticData>) -> ExternRef<ItemLibrary>;
@@ -101,6 +135,7 @@ extern "wasm" {
     fn library_settings_get_maximum_level(ptr: ExternRef<LibrarySettings>) -> LevelInt;
 }
 
+#[cfg(not(feature = "mock_data"))]
 pub trait DataLibrary<T>: Cacheable
 where
     T: ExternalReferenceType,
@@ -147,3 +182,32 @@ where
         v
     }
 }
+
+#[cfg(feature = "mock_data")]
+pub trait DataLibrary<T>: Cacheable
+where
+    T: Clone,
+{
+    fn get_cache(&self) -> &RwLock<BTreeMap<u32, T>>;
+    fn get_self_ref(&self) -> ExternRef<Self>
+    where
+        Self: Sized;
+
+    fn get(&self, name: &StringKey) -> Option<T>
+    where
+        Self: Sized,
+    {
+        self.get_cache().read().get(&name.hash()).cloned()
+    }
+
+    fn get_by_hash(&self, hash: u32) -> Option<T>
+    where
+        Self: Sized,
+    {
+        self.get_cache().read().get(&hash).cloned()
+    }
+
+    fn insert(&self, hash: u32, item: T) {
+        self.get_cache().write().insert(hash, item);
+    }
+}
diff --git a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/move_library.rs b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/move_library.rs
index 4f5f159..1b2265d 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/move_library.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/move_library.rs
@@ -16,6 +16,7 @@ pub struct MoveLibrary {
 }
 
 impl MoveLibrary {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
         Self {
             inner: Rc::new(MoveLibraryInner {
@@ -24,6 +25,16 @@ impl MoveLibrary {
             }),
         }
     }
+
+    #[cfg(feature = "mock_data")]
+    pub fn mock() -> Self {
+        Self {
+            inner: Rc::new(MoveLibraryInner {
+                ptr: ExternRef::mock(),
+                cache: Default::default(),
+            }),
+        }
+    }
 }
 
 impl DataLibrary<MoveData> for MoveLibrary {
@@ -35,10 +46,12 @@ impl DataLibrary<MoveData> for MoveLibrary {
         self.inner.ptr
     }
 
+    #[cfg(not(feature = "mock_data"))]
     fn _get_ref_by_name(ptr: ExternRef<Self>, name: ExternRef<StringKey>) -> ExternRef<MoveData> {
         unsafe { move_library_get_move(ptr, name) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     fn _get_ref_by_hash(ptr: ExternRef<Self>, hash: u32) -> ExternRef<MoveData> {
         unsafe { move_library_get_move_by_hash(ptr, hash) }
     }
@@ -46,12 +59,14 @@ impl DataLibrary<MoveData> for MoveLibrary {
 
 crate::handling::cacheable::cacheable!(MoveLibrary);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for MoveLibrary {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn move_library_get_move(
         ptr: ExternRef<MoveLibrary>,
diff --git a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/species_library.rs b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/species_library.rs
index 4bd9b9f..f347099 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/species_library.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/species_library.rs
@@ -15,7 +15,8 @@ pub struct SpeciesLibrary {
 }
 
 impl SpeciesLibrary {
-    pub(crate) fn new(ptr: ExternRef<SpeciesLibrary>) -> Self {
+    #[cfg(not(feature = "mock_data"))]
+    pub fn new(ptr: ExternRef<SpeciesLibrary>) -> Self {
         Self {
             inner: Rc::new(SpeciesLibraryInner {
                 ptr,
@@ -23,6 +24,16 @@ impl SpeciesLibrary {
             }),
         }
     }
+
+    #[cfg(feature = "mock_data")]
+    pub fn mock() -> Self {
+        Self {
+            inner: Rc::new(SpeciesLibraryInner {
+                ptr: ExternRef::mock(),
+                cache: Default::default(),
+            }),
+        }
+    }
 }
 
 impl DataLibrary<Species> for SpeciesLibrary {
@@ -34,10 +45,12 @@ impl DataLibrary<Species> for SpeciesLibrary {
         self.inner.ptr
     }
 
+    #[cfg(not(feature = "mock_data"))]
     fn _get_ref_by_name(ptr: ExternRef<Self>, name: ExternRef<StringKey>) -> ExternRef<Species> {
         unsafe { species_library_get_species(ptr, name) }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     fn _get_ref_by_hash(ptr: ExternRef<Self>, hash: u32) -> ExternRef<Species> {
         unsafe { species_library_get_species_by_hash(ptr, hash) }
     }
@@ -45,12 +58,14 @@ impl DataLibrary<Species> for SpeciesLibrary {
 
 crate::handling::cacheable::cacheable!(SpeciesLibrary);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for SpeciesLibrary {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn species_library_get_species(
         ptr: ExternRef<SpeciesLibrary>,
diff --git a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/type_library.rs b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/type_library.rs
index fe07f01..807f37d 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/data_libraries/type_library.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/data_libraries/type_library.rs
@@ -17,6 +17,7 @@ pub struct TypeLibrary {
 }
 
 impl TypeLibrary {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(reference: ExternRef<Self>) -> Self {
         Self {
             inner: Rc::new(TypeLibraryInner {
@@ -26,7 +27,18 @@ impl TypeLibrary {
             }),
         }
     }
+    #[cfg(feature = "mock_data")]
+    pub fn mock() -> Self {
+        Self {
+            inner: Rc::new(TypeLibraryInner {
+                reference: ExternRef::mock(),
+                name_to_type_cache: Default::default(),
+                effectiveness_cache: Default::default(),
+            }),
+        }
+    }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_type_from_name(&self, name: &str) -> Option<u8> {
         if let Some(cached) = self.inner.name_to_type_cache.read().get(name) {
             return Some(*cached);
@@ -43,6 +55,7 @@ impl TypeLibrary {
         Some(v)
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_single_effectiveness(&self, attacking_type: u8, defending_type: u8) -> f32 {
         if let Some(cached) = self
             .inner
@@ -66,6 +79,7 @@ impl TypeLibrary {
         effectiveness
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_effectiveness(&self, attacking_type: u8, defending_types: &[u8]) -> f32 {
         let mut f = 1.0;
         for defending_type in defending_types {
@@ -77,12 +91,14 @@ impl TypeLibrary {
 
 crate::handling::cacheable::cacheable!(TypeLibrary);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for TypeLibrary {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn type_library_get_single_effectiveness(
         r: ExternRef<TypeLibrary>,
diff --git a/pkmn_lib_interface/src/app_interface/static_data/effect_parameter.rs b/pkmn_lib_interface/src/app_interface/static_data/effect_parameter.rs
index 56aa841..6e1b65d 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/effect_parameter.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/effect_parameter.rs
@@ -21,7 +21,8 @@ pub enum EffectParameter {
 }
 
 impl EffectParameter {
-    pub(crate) fn create(ptr: ExternRef<Self>) -> Self {
+    #[cfg(not(feature = "mock_data"))]
+    pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
         unsafe {
             match effect_parameter_get_type(ptr) {
                 EffectParameterType::None => Self::None,
@@ -36,12 +37,13 @@ impl EffectParameter {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for EffectParameter {
     fn from_extern_value(reference: ExternRef<Self>) -> Self
     where
         Self: Sized,
     {
-        EffectParameter::create(reference)
+        EffectParameter::new(reference)
     }
 }
 
@@ -59,6 +61,7 @@ impl Display for EffectParameter {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn effect_parameter_get_type(ptr: ExternRef<EffectParameter>) -> EffectParameterType;
     fn effect_parameter_as_bool(ptr: ExternRef<EffectParameter>) -> bool;
diff --git a/pkmn_lib_interface/src/app_interface/static_data/item.rs b/pkmn_lib_interface/src/app_interface/static_data/item.rs
index 2d782a4..d76c904 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/item.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/item.rs
@@ -56,6 +56,7 @@ pub struct Item {
 }
 
 impl Item {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(ItemInner {
@@ -68,6 +69,7 @@ impl Item {
         })
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn reference(&self) -> ExternRef<Self> {
         self.inner.reference
     }
@@ -83,6 +85,7 @@ impl Item {
         pub fn price(&self) -> i32;
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_flag(&self, flag: &StringKey) -> bool {
         unsafe { item_has_flag(self.inner.reference, flag.ptr()) }
     }
@@ -90,12 +93,14 @@ impl Item {
 
 crate::handling::cacheable::cacheable!(Item);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for Item {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
-        Item::new(reference)
+        Item::mock(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn item_get_name(ptr: ExternRef<Item>) -> ExternRef<StringKey>;
     fn item_get_category(ptr: ExternRef<Item>) -> ItemCategory;
@@ -103,3 +108,30 @@ extern "wasm" {
     fn item_get_price(ptr: ExternRef<Item>) -> i32;
     fn item_has_flag(ptr: ExternRef<Item>, flag: ExternRef<StringKey>) -> bool;
 }
+
+#[cfg(feature = "mock_data")]
+mod test {
+    use super::Item;
+    use super::ItemInner;
+    use crate::app_interface::{BattleItemCategory, ItemCategory};
+    use crate::{cached_value, ExternRef, StringKey};
+    use alloc::rc::Rc;
+
+    impl Item {
+        pub fn mock() -> Self {
+            Self {
+                inner: Rc::new(ItemInner {
+                    reference: ExternRef::mock(),
+                    name: StringKey::new("test").into(),
+                    category: ItemCategory::MiscItem.into(),
+                    battle_category: BattleItemCategory::None.into(),
+                    price: 0.into(),
+                }),
+            }
+        }
+
+        pub fn has_flag(&self) -> bool {
+            unimplemented!()
+        }
+    }
+}
diff --git a/pkmn_lib_interface/src/app_interface/static_data/move_data.rs b/pkmn_lib_interface/src/app_interface/static_data/move_data.rs
index 8bd79f6..d153cd8 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/move_data.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/move_data.rs
@@ -1,4 +1,4 @@
-use crate::app_interface::{get_hash, StringKey};
+use crate::app_interface::{get_hash_const, StringKey};
 use crate::handling::cached_value::CachedValue;
 use crate::handling::Cacheable;
 use crate::{cached_value, cached_value_getters, ExternRef, ExternalReferenceType};
@@ -50,6 +50,7 @@ pub struct MoveData {
 }
 
 impl MoveData {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
         MoveData::from_ref(ptr, &|ptr| Self {
             inner: Rc::new(MoveDataInner {
@@ -65,6 +66,31 @@ impl MoveData {
             }),
         })
     }
+    #[cfg(feature = "mock_data")]
+    pub fn mock(
+        name: &str,
+        move_type: u8,
+        category: MoveCategory,
+        base_power: u8,
+        accuracy: u8,
+        base_usages: u8,
+        target: MoveTarget,
+        priority: i8,
+    ) -> Self {
+        Self {
+            inner: Rc::new(MoveDataInner {
+                ptr: ExternRef::mock(),
+                name: StringKey::new(name).into(),
+                move_type: move_type.into(),
+                category: category.into(),
+                base_power: base_power.into(),
+                accuracy: accuracy.into(),
+                base_usages: base_usages.into(),
+                target: target.into(),
+                priority: priority.into(),
+            }),
+        }
+    }
 
     cached_value_getters! {
         pub fn name(&self) -> StringKey;
@@ -76,12 +102,15 @@ impl MoveData {
         pub fn target(&self) -> MoveTarget;
         pub fn priority(&self) -> i8;
     }
+
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_flag<const N: usize>(&self, flag: &[u8; N]) -> bool {
-        let hash = get_hash(flag);
+        let hash = get_hash_const(flag);
         unsafe { move_data_has_flag_by_hash(self.inner.ptr, hash) }
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for MoveData {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         MoveData::new(reference)
@@ -90,6 +119,7 @@ impl ExternalReferenceType for MoveData {
 
 crate::handling::cacheable::cacheable!(MoveData);
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn move_data_get_name(ptr: ExternRef<MoveData>) -> ExternRef<StringKey>;
     fn move_data_get_type(ptr: ExternRef<MoveData>) -> u8;
diff --git a/pkmn_lib_interface/src/app_interface/static_data/nature.rs b/pkmn_lib_interface/src/app_interface/static_data/nature.rs
index d1392d1..a2a6449 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/nature.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/nature.rs
@@ -23,6 +23,7 @@ pub struct Nature {
 crate::handling::cacheable::cacheable!(Nature);
 
 impl Nature {
+    #[cfg(not(feature = "mock_data"))]
     pub fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| unsafe {
             Self {
@@ -38,12 +39,14 @@ impl Nature {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for Nature {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn nature_get_increase_stat(r: ExternRef<Nature>) -> Statistic;
     fn nature_get_decrease_stat(r: ExternRef<Nature>) -> Statistic;
diff --git a/pkmn_lib_interface/src/app_interface/static_data/species.rs b/pkmn_lib_interface/src/app_interface/static_data/species.rs
index f7168f6..d095c6e 100644
--- a/pkmn_lib_interface/src/app_interface/static_data/species.rs
+++ b/pkmn_lib_interface/src/app_interface/static_data/species.rs
@@ -1,4 +1,4 @@
-use crate::app_interface::get_hash;
+use crate::app_interface::get_hash_const;
 use crate::handling::cached_value::CachedValue;
 use crate::handling::Cacheable;
 use crate::{
@@ -49,6 +49,7 @@ pub struct ImmutableStatisticSet {
 }
 
 impl ImmutableStatisticSet {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(ImmutableStatisticSetInner {
@@ -106,6 +107,7 @@ pub struct Form {
 }
 
 impl Form {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(reference: ExternRef<Self>) -> Self {
         Self::from_ref(reference, &|reference| Self {
             inner: Rc::new(FormInner {
@@ -144,8 +146,9 @@ impl Form {
         self.inner.types.value_ref()
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_flag<const N: usize>(&self, flag: &[u8; N]) -> bool {
-        let hash = get_hash(flag);
+        let hash = get_hash_const(flag);
         unsafe { form_has_flag_by_hash(self.inner.reference, hash) }
     }
 }
@@ -166,6 +169,7 @@ pub struct Species {
 }
 
 impl Species {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(reference: ExternRef<Species>) -> Self {
         Self {
             inner: Rc::new(SpeciesInner {
@@ -200,8 +204,9 @@ impl Species {
         pub fn capture_rate(&self) -> u8;
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn get_form<const N: usize>(&self, form_name: &[u8; N]) -> Option<Form> {
-        let hash = get_hash(form_name);
+        let hash = get_hash_const(form_name);
         unsafe {
             if let Some(v) = self.inner.forms.read().get(&hash) {
                 v.clone()
@@ -214,24 +219,28 @@ impl Species {
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn has_flag<const N: usize>(&self, flag: &[u8; N]) -> bool {
-        let hash = get_hash(flag);
+        let hash = get_hash_const(flag);
         unsafe { species_has_flag_by_hash(self.inner.reference, hash) }
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for ImmutableStatisticSet {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for Form {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for Species {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         Self::new(reference)
@@ -242,6 +251,7 @@ crate::handling::cacheable::cacheable!(ImmutableStatisticSet);
 crate::handling::cacheable::cacheable!(Form);
 crate::handling::cacheable::cacheable!(Species);
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn static_statistics_set_get_hp(r: ExternRef<ImmutableStatisticSet>) -> u16;
     fn static_statistics_set_get_attack(r: ExternRef<ImmutableStatisticSet>) -> u16;
diff --git a/pkmn_lib_interface/src/app_interface/string_key.rs b/pkmn_lib_interface/src/app_interface/string_key.rs
index 223a5e4..9cb84a6 100644
--- a/pkmn_lib_interface/src/app_interface/string_key.rs
+++ b/pkmn_lib_interface/src/app_interface/string_key.rs
@@ -17,6 +17,7 @@ pub struct StringKey {
 }
 
 impl StringKey {
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
         StringKey::from_ref(ptr, &|ptr| -> StringKey {
             StringKey {
@@ -29,10 +30,12 @@ impl StringKey {
         })
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub(super) fn ptr(&self) -> ExternRef<Self> {
         self.data.ptr
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub fn str(&self) -> &CString {
         if self.data.str.borrow().is_none() {
             unsafe {
@@ -43,6 +46,13 @@ impl StringKey {
         }
         unsafe { (*self.data.str.as_ptr()).as_ref().unwrap() }
     }
+
+    #[cfg(feature = "mock_data")]
+    pub fn str(&self) -> &CString {
+        unsafe { (*self.data.str.as_ptr()).as_ref().unwrap() }
+    }
+
+    #[cfg(not(feature = "mock_data"))]
     pub fn hash(&self) -> u32 {
         if self.data.hash.borrow().is_none() {
             unsafe {
@@ -53,10 +63,16 @@ impl StringKey {
         }
         self.data.hash.borrow().unwrap()
     }
+
+    #[cfg(feature = "mock_data")]
+    pub fn hash(&self) -> u32 {
+        self.data.hash.borrow().unwrap()
+    }
 }
 
 crate::handling::cacheable::cacheable!(StringKey);
 
+#[cfg(not(feature = "mock_data"))]
 impl ExternalReferenceType for StringKey {
     fn from_extern_value(reference: ExternRef<Self>) -> Self {
         StringKey::new(reference)
@@ -70,6 +86,7 @@ impl Display for StringKey {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn string_key_get_str(ptr: ExternRef<StringKey>) -> *mut c_char;
     fn string_key_get_hash(ptr: ExternRef<StringKey>) -> u32;
@@ -117,7 +134,7 @@ const fn to_lower(c: u8) -> u8 {
     c
 }
 
-pub const fn get_hash<const N: usize>(s: &[u8; N]) -> u32 {
+pub const fn get_hash_const<const N: usize>(s: &[u8; N]) -> u32 {
     let mut crc: u32 = 0xffffffff;
 
     let mut i: usize = 0;
@@ -127,3 +144,37 @@ pub const fn get_hash<const N: usize>(s: &[u8; N]) -> u32 {
     }
     crc ^ 0xffffffff
 }
+
+pub const fn get_hash(s: &[u8]) -> u32 {
+    let mut crc: u32 = 0xffffffff;
+
+    let mut i: usize = 0;
+    while i < s.len() {
+        crc = (crc >> 8) ^ CRC_TABLE[((crc ^ (to_lower(s[i]) as u32)) & 0xff) as usize];
+        i += 1;
+    }
+    crc ^ 0xffffffff
+}
+
+#[cfg(feature = "mock_data")]
+mod test {
+    use super::get_hash;
+    use super::StringKeyInner;
+    use crate::{ExternRef, StringKey};
+    use alloc::rc::Rc;
+    use core::cell::RefCell;
+    use cstr_core::CString;
+
+    impl StringKey {
+        pub fn new(s: &str) -> Self {
+            let hash = get_hash(s.as_bytes());
+            Self {
+                data: Rc::new(StringKeyInner {
+                    ptr: ExternRef::mock(),
+                    str: RefCell::new(Some(CString::new(s).unwrap())),
+                    hash: RefCell::new(Some(hash)),
+                }),
+            }
+        }
+    }
+}
diff --git a/pkmn_lib_interface/src/handling/cacheable.rs b/pkmn_lib_interface/src/handling/cacheable.rs
index 8edd186..3ac0b23 100644
--- a/pkmn_lib_interface/src/handling/cacheable.rs
+++ b/pkmn_lib_interface/src/handling/cacheable.rs
@@ -1,11 +1,15 @@
+#[cfg(not(feature = "mock_data"))]
 use crate::ExternRef;
+#[cfg(not(feature = "mock_data"))]
 use alloc::collections::BTreeMap;
 
 pub trait Cacheable {
+    #[cfg(not(feature = "mock_data"))]
     fn get_cache<'a>() -> &'a mut BTreeMap<ExternRef<Self>, Self>
     where
         Self: Sized;
 
+    #[cfg(not(feature = "mock_data"))]
     fn from_ref(ptr: ExternRef<Self>, ctor: &dyn Fn(ExternRef<Self>) -> Self) -> Self
     where
         Self: Sized,
@@ -23,9 +27,11 @@ pub trait Cacheable {
 macro_rules! cacheable {
     ($type: ty) => {
         paste::paste!{
+            #[cfg(not(feature = "mock_data"))]
             static mut [<$type:upper _CACHE>]: alloc::collections::BTreeMap<ExternRef<$type>, $type> =
                 alloc::collections::BTreeMap::new();
             impl crate::handling::Cacheable for $type {
+                #[cfg(not(feature = "mock_data"))]
                 fn get_cache<'a>() -> &'a mut alloc::collections::BTreeMap<ExternRef<$type>, $type> {
                     unsafe { &mut [<$type:upper _CACHE>] }
                 }
diff --git a/pkmn_lib_interface/src/handling/cached_value.rs b/pkmn_lib_interface/src/handling/cached_value.rs
index 8af5823..9a6f52e 100644
--- a/pkmn_lib_interface/src/handling/cached_value.rs
+++ b/pkmn_lib_interface/src/handling/cached_value.rs
@@ -1,10 +1,12 @@
 use alloc::boxed::Box;
 
+#[cfg(not(feature = "mock_data"))]
 pub struct CachedValue<T> {
     init_fn: Box<dyn Fn() -> T>,
     value: Option<T>,
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl<T> CachedValue<T> {
     pub fn new(init_fn: Box<dyn Fn() -> T>) -> Self {
         Self {
@@ -39,6 +41,37 @@ impl<T> CachedValue<T> {
     }
 }
 
+#[cfg(feature = "mock_data")]
+pub struct CachedValue<T: Clone> {
+    value: T,
+}
+#[cfg(feature = "mock_data")]
+impl<T: Clone> CachedValue<T> {
+    pub fn new(value: T) -> Self {
+        Self { value }
+    }
+
+    #[inline]
+    pub fn value(&self) -> T
+    where
+        T: Clone,
+    {
+        self.value.clone()
+    }
+
+    #[inline]
+    pub fn value_ref(&self) -> &T {
+        &self.value
+    }
+}
+
+#[cfg(feature = "mock_data")]
+impl<T: Clone> From<T> for CachedValue<T> {
+    fn from(value: T) -> Self {
+        Self::new(value)
+    }
+}
+
 #[macro_export]
 macro_rules! cached_value {
     ($init: block) => {
diff --git a/pkmn_lib_interface/src/handling/extern_ref.rs b/pkmn_lib_interface/src/handling/extern_ref.rs
index 213bece..43d5aae 100644
--- a/pkmn_lib_interface/src/handling/extern_ref.rs
+++ b/pkmn_lib_interface/src/handling/extern_ref.rs
@@ -35,6 +35,14 @@ impl<T> ExternRef<T> {
             resource_type: Default::default(),
         }
     }
+
+    #[cfg(feature = "mock_data")]
+    pub(crate) fn mock() -> Self {
+        Self {
+            p: 0,
+            resource_type: Default::default(),
+        }
+    }
 }
 
 impl<T> Clone for ExternRef<T> {
@@ -89,6 +97,7 @@ impl<T> VecExternRef<T> {
         v.1
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn at(&self, index: u32) -> ExternRef<T> {
         let p = unsafe { _vec_extern_ref_get_value(self.get_internal_index(), index) };
         ExternRef {
@@ -97,6 +106,7 @@ impl<T> VecExternRef<T> {
         }
     }
 
+    #[cfg(not(feature = "mock_data"))]
     pub(crate) fn get_immutable_list(&self) -> ImmutableList<T>
     where
         T: Clone,
@@ -168,6 +178,7 @@ macro_rules! impl_extern_ctor {
     };
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn _vec_extern_ref_get_value(extern_ref: u32, index: u32) -> u32;
 }
diff --git a/pkmn_lib_interface/src/handling/ffi_array.rs b/pkmn_lib_interface/src/handling/ffi_array.rs
index 5d487e0..fe069d7 100644
--- a/pkmn_lib_interface/src/handling/ffi_array.rs
+++ b/pkmn_lib_interface/src/handling/ffi_array.rs
@@ -34,6 +34,7 @@ impl<T> FFIArray<T> {
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" fn delete_ffi_array(a: FFIArray<u8>) {
     a.delete()
 }
diff --git a/pkmn_lib_interface/src/handling/mod.rs b/pkmn_lib_interface/src/handling/mod.rs
index d82784b..b22b94f 100644
--- a/pkmn_lib_interface/src/handling/mod.rs
+++ b/pkmn_lib_interface/src/handling/mod.rs
@@ -45,7 +45,8 @@ macro_rules! wasm_reference_getters {
 
         }
 
-        extern "wasm" {
+        #[cfg(not(feature = "mock_data"))]
+extern "wasm" {
             $(
                 paste::paste!{
                     fn [<$base_type:snake _get_ $name>](r: ExternRef<$base_type>) -> ExternRef<$type>;
@@ -78,7 +79,8 @@ macro_rules! wasm_optional_reference_getters {
 
         }
 
-        extern "wasm" {
+        #[cfg(not(feature = "mock_data"))]
+extern "wasm" {
             $(
                 paste::paste!{
                     fn [<$base_type:snake get_ $name>](r: ExternRef<$base_type>) -> ExternRef<$type>;
@@ -97,13 +99,14 @@ macro_rules! wasm_value_getters {
             $v:vis fn $name:ident(&self) -> $type:ty;
         )*
     ) => {
+        #[cfg(not(feature = "mock_data"))]
         impl $base_type {
             $(
                 $(#[$attr])*
                 $v fn $name(&self) -> $type {
                     paste::paste!{
                         unsafe{
-                            [<$base_type:snake get_ $name>](self.inner.reference)
+                            [<$base_type:snake _get_ $name>](self.inner.reference)
                         }
                     }
                 }
@@ -111,10 +114,11 @@ macro_rules! wasm_value_getters {
 
         }
 
-        extern "wasm" {
+#[cfg(not(feature = "mock_data"))]
+extern "wasm" {
             $(
                 paste::paste!{
-                    fn [<$base_type:snake get_ $name>](r: ExternRef<$base_type>) -> $type;
+                    fn [<$base_type:snake _get_ $name>](r: ExternRef<$base_type>) -> $type;
                 }
             )*
         }
diff --git a/pkmn_lib_interface/src/handling/script.rs b/pkmn_lib_interface/src/handling/script.rs
index 5902e3e..ba4319b 100644
--- a/pkmn_lib_interface/src/handling/script.rs
+++ b/pkmn_lib_interface/src/handling/script.rs
@@ -34,6 +34,7 @@ pub trait OwnerGetter {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     pub fn get_script_owner(pointer: *const c_void) -> ExternRef<u8>;
 }
diff --git a/pkmn_lib_interface/src/handling/temporary.rs b/pkmn_lib_interface/src/handling/temporary.rs
index ca7c7c2..71e6f31 100644
--- a/pkmn_lib_interface/src/handling/temporary.rs
+++ b/pkmn_lib_interface/src/handling/temporary.rs
@@ -9,12 +9,16 @@ struct TemporaryData<T> {
     value: T,
 }
 
+#[cfg(not(feature = "mock_data"))]
 pub struct Temporary<T> {
     value: *mut TemporaryData<T>,
 }
 
+#[cfg(not(feature = "mock_data"))]
 static mut TEMPORARIES: alloc::collections::BTreeMap<u32, *const u8> =
     alloc::collections::BTreeMap::new();
+
+#[cfg(not(feature = "mock_data"))]
 impl<T> Temporary<T>
 where
     T: ExternalReferenceType,
@@ -75,6 +79,7 @@ where
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl<T> Clone for Temporary<T> {
     fn clone(&self) -> Self {
         *unsafe { self.value.as_mut() }.unwrap().use_count.get_mut() += 1;
@@ -82,6 +87,7 @@ impl<T> Clone for Temporary<T> {
     }
 }
 
+#[cfg(not(feature = "mock_data"))]
 impl<T> Drop for Temporary<T> {
     fn drop(&mut self) {
         let data = unsafe { self.value.as_mut() }.unwrap();
@@ -92,3 +98,21 @@ impl<T> Drop for Temporary<T> {
         }
     }
 }
+
+#[cfg(feature = "mock_data")]
+pub struct Temporary<T: Clone> {
+    value: T,
+}
+
+#[cfg(feature = "mock_data")]
+impl<T: Clone> Temporary<T> {
+    #[inline]
+    pub fn value(&self) -> T {
+        self.value.clone()
+    }
+
+    #[inline]
+    pub fn value_ref(&self) -> &T {
+        &self.value
+    }
+}
diff --git a/pkmn_lib_interface/src/lib.rs b/pkmn_lib_interface/src/lib.rs
index 7b538c1..2e75b7d 100644
--- a/pkmn_lib_interface/src/lib.rs
+++ b/pkmn_lib_interface/src/lib.rs
@@ -12,7 +12,7 @@
 #![feature(wasm_abi)]
 #![feature(thread_local)]
 #![feature(build_hasher_simple_hash_one)]
-#![no_std]
+#![cfg_attr(not(feature = "mock_data"), no_std)]
 #![allow(incomplete_features)]
 
 extern crate alloc;
@@ -26,7 +26,9 @@ use crate::app_interface::list::ImmutableList;
 use crate::app_interface::{DynamicLibrary, EffectParameter, StringKey, TurnChoice};
 pub(crate) use crate::handling::extern_ref::*;
 use crate::handling::ffi_array::FFIArray;
-use crate::handling::{Script, ScriptCapabilities, ScriptCategory};
+#[cfg(not(feature = "mock_data"))]
+use crate::handling::ScriptCapabilities;
+use crate::handling::{Script, ScriptCategory};
 use alloc::boxed::Box;
 
 #[macro_use]
@@ -46,6 +48,7 @@ pub fn set_load_script_fn(f: LoadScriptFnType) {
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" fn load_script(category: ScriptCategory, name: ExternRef<StringKey>) -> u32 {
     let name_c = StringKey::new(name);
     let boxed_script = unsafe { &LOAD_SCRIPT_FN }.as_ref().unwrap()(category, &name_c);
@@ -57,6 +60,7 @@ extern "wasm" fn load_script(category: ScriptCategory, name: ExternRef<StringKey
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 unsafe extern "wasm" fn destroy_script(script: *mut Box<dyn Script>) {
     // By turning it from a raw pointer back into a Box with from_raw, we give ownership back to rust.
     // This lets Rust do the cleanup.
@@ -65,6 +69,7 @@ unsafe extern "wasm" fn destroy_script(script: *mut Box<dyn Script>) {
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 unsafe extern "wasm" fn get_script_capabilities(
     script: *const Box<dyn Script>,
 ) -> FFIArray<ScriptCapabilities> {
@@ -73,6 +78,7 @@ unsafe extern "wasm" fn get_script_capabilities(
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 unsafe extern "wasm" fn script_on_initialize(
     script: *const Box<dyn Script>,
     library: ExternRef<DynamicLibrary>,
@@ -88,6 +94,7 @@ unsafe extern "wasm" fn script_on_initialize(
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 unsafe extern "wasm" fn script_on_before_turn(
     script: *const Box<dyn Script>,
     choice: ExternRef<TurnChoice>,
diff --git a/pkmn_lib_interface/src/utils.rs b/pkmn_lib_interface/src/utils.rs
index 9df7d26..66521b1 100644
--- a/pkmn_lib_interface/src/utils.rs
+++ b/pkmn_lib_interface/src/utils.rs
@@ -1,9 +1,11 @@
 use alloc::alloc::alloc;
 use core::alloc::Layout;
-#[cfg(not(test))]
+#[cfg(not(feature = "mock_data"))]
 use core::panic::PanicInfo;
-use cstr_core::c_char;
+use cstr_core::{c_char, CStr, CString};
 
+#[cfg(not(feature = "mock_data"))]
+#[cfg(not(feature = "mock_data"))]
 extern "wasm" {
     fn _print(s: *const u8, len: usize);
     fn _error(
@@ -16,12 +18,20 @@ extern "wasm" {
     );
 }
 
+#[cfg(not(feature = "mock_data"))]
 pub fn print_raw(s: &[c_char]) {
     unsafe {
         _print(s.as_ptr(), s.len());
     }
 }
 
+#[cfg(feature = "mock_data")]
+pub fn print_raw(s: &[u8]) {
+    unsafe {
+        println!("{}", CString::new(s).unwrap().into_string().unwrap());
+    }
+}
+
 #[macro_export]
 macro_rules! println { ($($args:tt)*) => { pkmn_lib_interface::utils::print_raw(alloc::format!($($args)*).as_bytes()); } }
 
@@ -37,6 +47,7 @@ macro_rules! dbg {
 
 #[panic_handler]
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 #[cfg(not(test))]
 pub fn begin_panic_handler(panic_info: &PanicInfo<'_>) -> ! {
     let msg = panic_info.message().unwrap().as_str().unwrap();
@@ -64,12 +75,14 @@ pub fn begin_panic_handler(panic_info: &PanicInfo<'_>) -> ! {
 
 #[alloc_error_handler]
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 #[cfg(not(test))]
 fn allocation_error_handler(layout: core::alloc::Layout) -> ! {
     panic!("memory allocation of {} bytes failed", layout.size())
 }
 
 #[no_mangle]
+#[cfg(not(feature = "mock_data"))]
 unsafe extern "wasm" fn allocate_mem(len: u32, align: u32) -> *mut u8 {
     alloc(Layout::from_size_align(len as usize, align as usize).unwrap())
 }