Comment out GCD memory leak test

Spec/GCDTest.swift

@@ -11,20 +11,33 @@ class GCDTest: XCTestCase {
     func testScheduledBlockHandleDerefsBlockAfterInvoke() {
         let invokedExpectation = self.expectation(description: "scheduled block invoked")
 
+        // retain counter: 1
         var object = NSObject()
+
+        // store reference for above weakified
         weak var weakObject = object
 
+        // prepare schedule block
         var scheduledBlock = artDispatchScheduled(0, .main) { [object] in
+            // retain counter +1 -> sum: 2
             _ = object
             invokedExpectation.fulfill()
         }
 
+        // invoke block
         _ = scheduledBlock
 
         waitForExpectations(timeout: 2, handler: nil)
+
+        // destroy block reference
+        // `object` retain counter -1, sum: 1
         scheduledBlock = nil
 
+        // assign new object to old variable
+        // at this point old `object` should be destroyed, retain counter: -1, sum: 0 -> Destroy
         object = NSObject()
+
+        // check if old `object` reference was destroyed
         XCTAssertNil(weakObject)
     }
 }