test: decouple MaterialParameterToolTests with helpers (no inter-test calls)

Author: dsarno

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Tools/MaterialParameterToolTests.cs

@@ -96,13 +96,25 @@ public void CreateMaterial_WithObjectProperties_SucceedsAndSetsColor()
             }
         }
 
-        [Test]
-        public void AssignMaterial_ToSphere_UsingComponentPropertiesObject_Succeeds()
+        private void CreateTestMaterial()
         {
-            // Ensure material exists first
-            CreateMaterial_WithObjectProperties_SucceedsAndSetsColor();
+            var createParams = new JObject
+            {
+                ["action"] = "create",
+                ["path"] = _matPath,
+                ["assetType"] = "Material",
+                ["properties"] = new JObject
+                {
+                    ["shader"] = "Universal Render Pipeline/Lit",
+                    ["color"] = new JArray(0f, 0f, 1f, 1f)
+                }
+            };
+            var result = ToJObject(ManageAsset.HandleCommand(createParams));
+            Assert.IsTrue(result.Value<bool>("success"), result.Value<string>("error"));
+        }
 
-            // Create a sphere via handler
+        private void CreateSphere()
+        {
             var createGo = new JObject
             {
                 ["action"] = "create",
@@ -111,9 +123,18 @@ public void AssignMaterial_ToSphere_UsingComponentPropertiesObject_Succeeds()
             };
             var createGoResult = ToJObject(ManageGameObject.HandleCommand(createGo));
             Assert.IsTrue(createGoResult.Value<bool>("success"), createGoResult.Value<string>("error"));
-
             _sphere = GameObject.Find("ToolTestSphere");
             Assert.IsNotNull(_sphere, "Sphere should be created.");
+        }
+
+        [Test]
+        public void AssignMaterial_ToSphere_UsingComponentPropertiesObject_Succeeds()
+        {
+            CreateTestMaterial();
+            CreateSphere();
+
+            // Create a sphere via handler
+            
 
             // Assign material via object-typed componentProperties
             var modifyParams = new JObject
@@ -142,8 +163,20 @@ public void AssignMaterial_ToSphere_UsingComponentPropertiesObject_Succeeds()
         [Test]
         public void ReadRendererData_DoesNotInstantiateMaterial_AndIncludesSharedMaterial()
         {
-            // Prepare object and assignment
-            AssignMaterial_ToSphere_UsingComponentPropertiesObject_Succeeds();
+            CreateTestMaterial();
+            CreateSphere();
+            var modifyParams = new JObject
+            {
+                ["action"] = "modify",
+                ["target"] = "ToolTestSphere",
+                ["searchMethod"] = "by_name",
+                ["componentProperties"] = new JObject
+                {
+                    ["MeshRenderer"] = new JObject { ["sharedMaterial"] = _matPath }
+                }
+            };
+            var modifyResult = ToJObject(ManageGameObject.HandleCommand(modifyParams));
+            Assert.IsTrue(modifyResult.Value<bool>("success"), modifyResult.Value<string>("error"));
 
             var renderer = _sphere.GetComponent<MeshRenderer>();
             int beforeId = renderer.sharedMaterial != null ? renderer.sharedMaterial.GetInstanceID() : 0;