basic tests for a wider variety of files

tests/components/MovementSystemUnitTest.cs

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+using Godot;
+using GdUnit4;
+using static GdUnit4.Assertions;
+using Movementtests.interfaces;
+using Movementtests.scenes.movement;
+
+namespace Movementtests.tests;
+
+[TestSuite, RequireGodotRuntime]
+public class MovementSystemUnitTest
+{
+    [TestCase]
+    public void GroundedMovement_Accelerates_And_Applies_Gravity()
+    {
+        var move = new CGroundedMovement();
+        move.RMovement = new RMovement(speed: 10.0f, acceleration: 1.0f, gravityModifier: 0.5f, targetHeight: 0.0f);
+        move.WallInFrontRayCast = new RayCast3D();
+        move.GlobalPosition = Vector3.Zero;
+
+        var inputs = new MovementInputs(
+            Velocity: Vector3.Zero,
+            TargetLocation: new Vector3(10, 0, 0),
+            isOnFloor: false,
+            gravity: Vector3.Down * 9.8f,
+            delta: 1.0
+        );
+
+        var v = move.ComputeVelocity(inputs);
+
+        AssertVector(v).IsEqualApprox(new Vector3(10, -4.9f, 0), new Vector3(0.0001f, 0.0001f, 0.0001f));
+    }
+}