basic tests for a wider variety of files

tests/player/WeaponSystemUnitTest.cs

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+using Godot;
+using GdUnit4;
+using static GdUnit4.Assertions;
+using Movementtests.systems;
+using Movementtests.systems.damage;
+
+namespace Movementtests.tests;
+
+[TestSuite, RequireGodotRuntime]
+public class WeaponSystemUnitTest
+{
+    private WeaponSystem _weapon;
+
+    [BeforeTest]
+    public void SetupTest()
+    {
+        _weapon = new WeaponSystem();
+        _weapon.RDamage = new RDamage(5.0f, EDamageTypes.Normal);
+        
+        _weapon.WeaponMesh = new MeshInstance3D();
+        _weapon.AddChild(_weapon.WeaponMesh);
+        _weapon.WeaponLocationIndicator = new MeshInstance3D();
+        _weapon.AddChild(_weapon.WeaponLocationIndicator);
+    }
+
+    [AfterTest]
+    public void CleanupTest()
+    {
+        _weapon?.Free();
+    }
+
+    [TestCase]
+    public void TestWeaponLeftAndBackVisibility()
+    {
+        _weapon.Visible = false;
+
+        _weapon.WeaponLeft();
+        AssertBool(_weapon.Visible).IsTrue();
+
+        _weapon.WeaponBack();
+        AssertBool(_weapon.Visible).IsFalse();
+    }
+
+    [TestCase]
+    public void TestThrowWeaponOnCurveSetsUnfrozen()
+    {
+        _weapon.Freeze = true;
+        _weapon.ThrowWeaponOnCurve();
+        AssertBool(_weapon.Freeze).IsFalse();
+    }
+}