More unit tests, fixes

Plugins/PkmnLib.Plugin.Gen7.Tests/Scripts/Moves/EruptionTests.cs

@@ -0,0 +1,63 @@
+using PkmnLib.Dynamic.Models;
+using PkmnLib.Plugin.Gen7.Scripts.Moves;
+using PkmnLib.Static;
+
+namespace PkmnLib.Plugin.Gen7.Tests.Scripts.Moves;
+
+/// <summary>
+/// Tests for the <see cref="Eruption"/> move script.
+/// Gen VII Bulbapedia behavior: "Eruption deals damage. It has 150 base power at maximum HP, but its base
+/// power decreases linearly with the user's remaining HP", following ⌊150 × HPcurrent / HPmax⌋ with a
+/// minimum of 1.
+/// </summary>
+public class EruptionTests
+{
+    private static (Eruption script, IExecutingMove move, IPokemon target) CreateTestSetup(uint currentHealth,
+        uint maxHealth)
+    {
+        var script = new Eruption();
+        var move = Substitute.For<IExecutingMove>();
+        var user = Substitute.For<IPokemon>();
+        user.CurrentHealth.Returns(currentHealth);
+        user.BoostedStats.Returns(new StatisticSet<uint>(maxHealth, 1, 1, 1, 1, 1));
+        move.User.Returns(user);
+        var target = Substitute.For<IPokemon>();
+        return (script, move, target);
+    }
+
+    /// <summary>
+    /// Bulbapedia: "It has 150 base power at maximum HP, but its base power decreases linearly with the
+    /// user's remaining HP" — power = ⌊150 × HPcurrent / HPmax⌋, with integer truncation.
+    /// </summary>
+    [Test, Arguments(100u, 100u, (ushort)150), Arguments(300u, 300u, (ushort)150), Arguments(50u, 100u, (ushort)75),
+     Arguments(75u, 100u, (ushort)112), Arguments(33u, 100u, (ushort)49), Arguments(150u, 300u, (ushort)75)]
+    public async Task ChangeBasePower_ScalesWithUserCurrentHp(uint currentHealth, uint maxHealth, ushort expectedPower)
+    {
+        // Arrange
+        var (script, move, target) = CreateTestSetup(currentHealth, maxHealth);
+        ushort basePower = 150;
+
+        // Act
+        script.ChangeBasePower(move, target, 0, ref basePower);
+
+        // Assert
+        await Assert.That(basePower).IsEqualTo(expectedPower);
+    }
+
+    /// <summary>
+    /// Bulbapedia: "if this calculation yields a value below 1, the move's power becomes 1 instead."
+    /// </summary>
+    [Test, Arguments(1u, 300u), Arguments(1u, 151u)]
+    public async Task ChangeBasePower_UserAtVeryLowHp_PowerIsAtLeastOne(uint currentHealth, uint maxHealth)
+    {
+        // Arrange
+        var (script, move, target) = CreateTestSetup(currentHealth, maxHealth);
+        ushort basePower = 150;
+
+        // Act
+        script.ChangeBasePower(move, target, 0, ref basePower);
+
+        // Assert
+        await Assert.That(basePower).IsEqualTo((ushort)1);
+    }
+}