basic tests for a wider variety of files

tests/player/HeadSystemUnitTest.cs

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+using Godot;
+using GdUnit4;
+using static GdUnit4.Assertions;
+using Movementtests.systems;
+
+namespace Movementtests.tests;
+
+[TestSuite, RequireGodotRuntime]
+public class HeadSystemUnitTest
+{
+    private HeadSystem _head;
+
+    [BeforeTest]
+    public void SetupTest()
+    {
+        _head = new HeadSystem();
+        _head._camera = new Camera3D();
+        _head.AddChild(_head._camera);
+        
+        _head._cameraAnchor = new Marker3D();
+        _head.AddChild(_head._cameraAnchor);
+        
+        _head._fpRig = new Node3D();
+        _head.AddChild(_head._fpRig);
+        
+        _head._fpDisplacedRig = new Node3D();
+        _head.AddChild(_head._fpDisplacedRig);
+    }
+
+    [AfterTest]
+    public void CleanupTest()
+    {
+        _head?.Free();
+    }
+
+    [TestCase]
+    public void TestResetHeadBobbing()
+    {
+        _head._bobbingAccumulator = 10.0f;
+        _head.ResetHeadBobbing();
+        AssertFloat(_head._bobbingAccumulator).IsEqual(0.0f);
+    }
+
+    [TestCase]
+    public void TestComputeHowMuchInputForward()
+    {
+        Vector3 forwardInput = new Vector3(0, 0, -1);
+        AssertFloat(_head.ComputeHowMuchInputForward(forwardInput)).IsEqual(1.0f);
+
+        Vector3 backwardInput = new Vector3(0, 0, 1);
+        AssertFloat(_head.ComputeHowMuchInputForward(backwardInput)).IsEqual(-1.0f);
+    }
+
+    [TestCase]
+    public void TestComputeHowMuchInputSideways()
+    {
+        Vector3 rightInput = new Vector3(1, 0, 0);
+        AssertFloat(_head.ComputeHowMuchInputSideways(rightInput)).IsEqual(1.0f);
+
+        Vector3 leftInput = new Vector3(-1, 0, 0);
+        AssertFloat(_head.ComputeHowMuchInputSideways(leftInput)).IsEqual(-1.0f);
+    }
+
+    [TestCase]
+    public void TestGetForwardHorizontalVector()
+    {
+        Vector3 forward = _head.GetForwardHorizontalVector();
+        AssertVector(forward).IsEqualApprox(Vector3.Back, new Vector3(0.001f, 0.001f, 0.001f));
+    }
+
+    [TestCase]
+    public void TestLookAroundRotation()
+    {
+        var inputs = new HeadSystem.CameraParameters(
+            Delta: 0.016,
+            LookDir: new Vector2(1, 0),
+            PlayerInput: Vector3.Zero,
+            PlayerVelocity: Vector3.Zero,
+            WallContactPoint: Vector3.Zero,
+            SensitivitMultiplier: 1.0f,
+            WithCameraJitter: false,
+            WithCameraBobbing: false,
+            BobbingMultiplier: 1.0f,
+            FovMultiplier: 1.0f
+        );
+
+        float initialY = _head.Rotation.Y;
+        _head.LookAround(inputs);
+        AssertFloat(_head.Rotation.Y).IsEqual(initialY + 1.0f);
+    }
+}