More tests, more fixes

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

@@ -0,0 +1,62 @@
+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="CrushGrip"/> move script.
+/// Gen VII Bulbapedia behavior: "Crush Grip deals damage. Its power is greater the more HP the target
+/// has." Power = 120 × (Current HP target / Max HP target), with a minimum of 1.
+/// </summary>
+public class CrushGripTests
+{
+    private static (CrushGrip script, IExecutingMove move, IPokemon target) CreateTestSetup(uint currentHealth,
+        uint maxHealth)
+    {
+        var script = new CrushGrip();
+        var move = Substitute.For<IExecutingMove>();
+        var target = Substitute.For<IPokemon>();
+        target.CurrentHealth.Returns(currentHealth);
+        target.BoostedStats.Returns(new StatisticSet<uint>(maxHealth, 1, 1, 1, 1, 1));
+        return (script, move, target);
+    }
+
+    /// <summary>
+    /// Bulbapedia: "Power = 120 × (Current HP target / Max HP target)" — at full HP the power is 120, and
+    /// it scales down (with integer truncation) as the target's HP drops.
+    /// </summary>
+    [Test, Arguments(100u, 100u, (ushort)120), Arguments(200u, 200u, (ushort)120), Arguments(50u, 100u, (ushort)60),
+     Arguments(75u, 100u, (ushort)90), Arguments(33u, 100u, (ushort)39), Arguments(1u, 4u, (ushort)30)]
+    public async Task ChangeBasePower_ScalesWithTargetCurrentHp(uint currentHealth, uint maxHealth,
+        ushort expectedPower)
+    {
+        // Arrange
+        var (script, move, target) = CreateTestSetup(currentHealth, maxHealth);
+        ushort basePower = 120;
+
+        // Act
+        script.ChangeBasePower(move, target, 0, ref basePower);
+
+        // Assert
+        await Assert.That(basePower).IsEqualTo(expectedPower);
+    }
+
+    /// <summary>
+    /// Bulbapedia: the power varies "between 1 and 120 [...] with a minimum of 1" — even against a target
+    /// with almost no HP left, the power cannot drop below 1.
+    /// </summary>
+    [Test, Arguments(1u, 200u), Arguments(1u, 121u)]
+    public async Task ChangeBasePower_TargetAtVeryLowHp_PowerIsAtLeastOne(uint currentHealth, uint maxHealth)
+    {
+        // Arrange
+        var (script, move, target) = CreateTestSetup(currentHealth, maxHealth);
+        ushort basePower = 120;
+
+        // Act
+        script.ChangeBasePower(move, target, 0, ref basePower);
+
+        // Assert
+        await Assert.That(basePower).IsEqualTo((ushort)1);
+    }
+}