More unit tests, more fixes

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

@@ -0,0 +1,31 @@
+using PkmnLib.Dynamic.Models.Choices;
+using PkmnLib.Plugin.Gen7.Scripts.Moves;
+
+namespace PkmnLib.Plugin.Gen7.Tests.Scripts.Moves;
+
+/// <summary>
+/// Tests for the <see cref="DoubleHitMove"/> script, which implements Double Hit (and the other
+/// fixed two-hit moves such as Double Kick, Dual Chop, Bonemerang and Gear Grind).
+/// Behavior is verified against the Bulbapedia page for Double Hit.
+/// </summary>
+public class DoubleHitMoveTests
+{
+    /// <summary>
+    /// Bulbapedia: "Double Hit inflicts damage, hitting twice per use." The number of hits is always set
+    /// to two, regardless of the default.
+    /// </summary>
+    [Test, Arguments((byte)1), Arguments((byte)2), Arguments((byte)5)]
+    public async Task ChangeNumberOfHits_AnyInitialValue_SetsNumberOfHitsToTwo(byte initialHits)
+    {
+        // Arrange
+        var script = new DoubleHitMove();
+        var choice = Substitute.For<IMoveChoice>();
+        var numberOfHits = initialHits;
+
+        // Act
+        script.ChangeNumberOfHits(choice, ref numberOfHits);
+
+        // Assert
+        await Assert.That(numberOfHits).IsEqualTo((byte)2);
+    }
+}