basic tests for a wider variety of files

tests/components/KnockbackComponentUnitTest.cs

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+using Godot;
+using GdUnit4;
+using static GdUnit4.Assertions;
+using Movementtests.interfaces;
+
+namespace Movementtests.tests;
+
+[TestSuite, RequireGodotRuntime]
+public class KnockbackComponentUnitTest
+{
+    [TestCase]
+    public void RegisterAndComputeKnockback_Works_And_Resets()
+    {
+        var cKnock = new CKnockback();
+        cKnock.RKnockback = new RKnockback(2.0f);
+        cKnock.GlobalPosition = Vector3.Zero;
+
+        var damage = new DamageRecord(new Vector3(10, 0, 0), new RDamage(0, Movementtests.systems.damage.EDamageTypes.Normal));
+        var record = new KnockbackRecord(damage, 1.5f);
+
+        cKnock.RegisterKnockback(record);
+        var force = cKnock.ComputeKnockback();
+
+        // Direction from source(10,0,0) to target(0,0,0) is (-1,0,0), scaled by modifier(2) and multiplier(1.5) => (-3,0,0)
+        AssertVector(force).IsEqual(new Vector3(-3, 0, 0));
+
+        // Second call returns zero since internal state resets
+        var second = cKnock.ComputeKnockback();
+        AssertVector(second).IsEqual(Vector3.Zero);
+    }
+}