Many more tests and fixes

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

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+using PkmnLib.Dynamic.Models;
+using PkmnLib.Plugin.Gen7.Scripts.Moves;
+
+namespace PkmnLib.Plugin.Gen7.Tests.Scripts.Moves;
+
+/// <summary>
+/// Tests for the <see cref="GastroAcid"/> move script.
+/// Gen VII Bulbapedia behavior: "Gastro Acid suppresses the target's Ability while it remains in battle."
+/// </summary>
+/// <remarks>
+/// Bulbapedia also lists Abilities the move fails against (Multitype, Stance Change, ...); that check is
+/// implemented engine-side through <see cref="PkmnLib.Static.Species.IAbility.CanBeChanged"/> inside
+/// <see cref="IPokemon.SuppressAbility"/>, so it is not the responsibility of this script.
+/// </remarks>
+public class GastroAcidTests
+{
+    /// <summary>
+    /// Bulbapedia: "Gastro Acid suppresses the target's Ability while it remains in battle."
+    /// The script requests the suppression on the target.
+    /// </summary>
+    [Test]
+    public async Task OnSecondaryEffect_Always_SuppressesTargetAbility()
+    {
+        // Arrange
+        var script = new GastroAcid();
+        var move = Substitute.For<IExecutingMove>();
+        var target = Substitute.For<IPokemon>();
+
+        // Act
+        script.OnSecondaryEffect(move, target, 0);
+
+        // Assert
+        target.Received(1).SuppressAbility();
+        await Assert.That(target.ReceivedCalls().Any(c => c.GetMethodInfo().Name == "SuppressAbility")).IsTrue();
+    }
+
+    /// <summary>
+    /// Bulbapedia: the suppression applies to "the target's Ability" — the user's own Ability is left
+    /// untouched.
+    /// </summary>
+    [Test]
+    public async Task OnSecondaryEffect_Always_DoesNotSuppressUserAbility()
+    {
+        // Arrange
+        var script = new GastroAcid();
+        var move = Substitute.For<IExecutingMove>();
+        var user = Substitute.For<IPokemon>();
+        move.User.Returns(user);
+        var target = Substitute.For<IPokemon>();
+
+        // Act
+        script.OnSecondaryEffect(move, target, 0);
+
+        // Assert
+        await Assert.That(user.ReceivedCalls().Any(c => c.GetMethodInfo().Name == "SuppressAbility")).IsFalse();
+    }
+}