Update test case

Author: dreampiggy

Tests/Tests/SDUtilsTests.m

@@ -157,35 +157,48 @@ - (void)testSDScaledImageForKey {
 - (void)testSDCallbackQueue {
     XCTestExpectation *expectation1 = [self expectationWithDescription:@"SDCallbackQueue SafeExecute works"];
     XCTestExpectation *expectation2 = [self expectationWithDescription:@"SDCallbackQueue Dispatch works"];
+    XCTestExpectation *expectation3 = [self expectationWithDescription:@"SDCallbackQueue Invoke works"];
     dispatch_queue_t queue = dispatch_queue_create("testSDCallbackQueue", NULL);
     SDCallbackQueue *callbackQueue = [[SDCallbackQueue alloc] initWithDispatchQueue:queue];
-    __block BOOL called1 = NO;
+    __block BOOL called = NO;
     [callbackQueue sync:^{
-        called1 = YES;
+        called = YES;
     }];
-    expect(called1).beTruthy();
+    expect(called).beTruthy();
 
-    __block BOOL called2 = NO;
+    __block BOOL called1 = NO;
     callbackQueue.policy = SDCallbackPolicySafeExecute;
     dispatch_async(queue, ^{
         // Should execute in sync
         [callbackQueue async:^{
-            called2 = YES;
+            called1 = YES;
             [expectation1 fulfill];
         }];
-        expect(called2).beTruthy();
+        expect(called1).beTruthy();
     });
 
     SDCallbackQueue *callbackQueue2 = [[SDCallbackQueue alloc] initWithDispatchQueue:queue];
-    __block BOOL called3 = NO;
+    __block BOOL called2 = NO;
     callbackQueue2.policy = SDCallbackPolicyDispatch;
     dispatch_async(queue, ^{
         // Should execute in async
         [callbackQueue2 async:^{
-            called3 = YES;
+            called2 = YES;
             [expectation2 fulfill];
         }];
-        expect(called3).beFalsy();
+        expect(called2).beFalsy();
+    });
+    
+    SDCallbackQueue *callbackQueue3 = [[SDCallbackQueue alloc] initWithDispatchQueue:queue];
+    __block BOOL called3 = NO;
+    callbackQueue3.policy = SDCallbackPolicyInvoke;
+    dispatch_async(queue, ^{
+        // Should execute in sync
+        [callbackQueue3 async:^{
+            called3 = YES;
+            [expectation3 fulfill];
+        }];
+        expect(called3).beTruthy();
     });
 
     [self waitForExpectationsWithCommonTimeout];