Initial support for require statements

tests/integration/ModuleTests.cpp

@@ -0,0 +1,45 @@
+#ifdef TESTS_BUILD
+#include <catch.hpp>
+#include "../src/Script.hpp"
+using namespace Porygon;
+
+class ModuleHandler{
+    static unordered_map<string, Script*> MODULES;
+
+    ~ModuleHandler(){
+        for (auto v: MODULES){
+            delete v.second;
+        }
+    }
+
+    inline static bool DoesModuleExist(const string& moduleName){
+        return MODULES.find(moduleName) != MODULES.end();
+    }
+
+    inline static Script* ResolveModule(const string& moduleName){
+        return MODULES[moduleName];
+    }
+
+public:
+    static void Initialize(){
+        ScriptOptions::GetDefaultScriptOptions()->SetModuleExistsFunc(DoesModuleExist);
+        ScriptOptions::GetDefaultScriptOptions()->SetResolveModuleFunc(ResolveModule);
+    }
+};
+
+unordered_map<string, Script*> ModuleHandler::MODULES = unordered_map<string, Script*>{
+        {"simple_return", Script::Create(u"return 500")}
+};
+
+TEST_CASE( "Require simple return script", "[integration]" ) {
+    ModuleHandler::Initialize();
+    auto script = Script::Create(uR"(
+return require("simple_return")
+)");
+    REQUIRE(!script->Diagnostics -> HasErrors());
+    auto var = script->Evaluate();
+    REQUIRE(var->EvaluateInteger() == 500);
+    delete script;
+}
+
+#endif