Resolve WES-181 "Missing code doc"

Assets/Architecture/Tests/EditMode/SystemControllerTests.cs

@@ -8,18 +8,27 @@ using UnityEngine.SceneManagement;
 [TestFixture]
 public class SystemControllerTests
 {
+    /// <summary>
+    /// Test whether the singleton instance is correctly returned
+    /// </summary>
     [Test]
     public void Test_SystemController_GetInstance()
     {
         Assert.IsNotNull(SystemController.GetInstance());
     }
 
+    /// <summary>
+    /// Test whether a non valid scene also yields a non valid index
+    /// </summary>
     [Test]
     public void Test_GetSceneIndex_InvalidScene()
     {
         Assert.AreEqual(-1, SystemController.GetSceneIndex("a/non/existing/scene"));
     }
 
+    /// <summary>
+    /// Test whether a valid scene also yields a valid index
+    /// </summary>
     [Test]
     public void Test_GetSceneIndex_ValidScene()
     {