Many more tests and fixes

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

@@ -0,0 +1,58 @@
+using PkmnLib.Dynamic.Models;
+using PkmnLib.Plugin.Gen7.Scripts.Moves;
+
+namespace PkmnLib.Plugin.Gen7.Tests.Scripts.Moves;
+
+/// <summary>
+/// Tests for the <see cref="GrassKnot"/> move script.
+/// Gen VII Bulbapedia behavior: "Grass Knot deals damage scaled by the target's weight rather than using a
+/// fixed base power", with cutoffs at 10, 25, 50, 100 and 200 kilograms.
+/// </summary>
+public class GrassKnotTests
+{
+    /// <summary>
+    /// Bulbapedia weight/power table: 0.1–9.9 kg → 20, 10.0–24.9 kg → 40, 25.0–49.9 kg → 60,
+    /// 50.0–99.9 kg → 80, 100.0–199.9 kg → 100, 200.0 kg or more → 120. Each cutoff is tested on both
+    /// sides of the boundary.
+    /// </summary>
+    [Test, Arguments(0.1f, (ushort)20), Arguments(9.9f, (ushort)20), Arguments(10.0f, (ushort)40),
+     Arguments(24.9f, (ushort)40), Arguments(25.0f, (ushort)60), Arguments(49.9f, (ushort)60),
+     Arguments(50.0f, (ushort)80), Arguments(99.9f, (ushort)80), Arguments(100.0f, (ushort)100),
+     Arguments(199.9f, (ushort)100), Arguments(200.0f, (ushort)120), Arguments(999.9f, (ushort)120)]
+    public async Task ChangeBasePower_TargetWeight_SetsBasePowerFromWeightTable(float weightInKg, ushort expectedPower)
+    {
+        // Arrange
+        var script = new GrassKnot();
+        var move = Substitute.For<IExecutingMove>();
+        var target = Substitute.For<IPokemon>();
+        target.WeightInKg.Returns(weightInKg);
+        ushort basePower = 1;
+
+        // Act
+        script.ChangeBasePower(move, target, 0, ref basePower);
+
+        // Assert
+        await Assert.That(basePower).IsEqualTo(expectedPower);
+    }
+
+    /// <summary>
+    /// Bulbapedia: the base power depends only on the target's weight — the incoming base power value is
+    /// fully replaced rather than modified.
+    /// </summary>
+    [Test]
+    public async Task ChangeBasePower_HighIncomingBasePower_IsReplacedByWeightTableValue()
+    {
+        // Arrange
+        var script = new GrassKnot();
+        var move = Substitute.For<IExecutingMove>();
+        var target = Substitute.For<IPokemon>();
+        target.WeightInKg.Returns(5f);
+        ushort basePower = 250;
+
+        // Act
+        script.ChangeBasePower(move, target, 0, ref basePower);
+
+        // Assert
+        await Assert.That(basePower).IsEqualTo((ushort)20);
+    }
+}