testAnimation.m

- (void) testAnimation {
  id mockGestureRecognizer = [OCMockObject mockForClass:[UIPanGestureRecognizer class]];
  CGPoint expectedPoint = CGPointMake(-10.0f, 20.0f); //velocity is in CGPoint unit
  [(UIPanGestureRecognizer *)[[mockGestureRecognizer expect] andReturnValue:OCMOCK_VALUE(expectedPoint)] velocityInView:v];
  
  id partialMockPinView = [OCMockObject partialMockForObject:v];
  [[partialMockPinView expect] updateSliderColor:delta];

  NSTimeInterval expectedAnimationDuration = fabs(expectedPoint.x) * 0.002 * 0.2;
  id mockView = [OCMockObject mockForClass:[UIView class]];
  [[[mockView expect] andDo:^(NSInvocation *i) {
    void (^animation)(void) = nil;
    void (^completion)(void) = nil;
    [i getArgument:&animation atIndex:3];
    [i getArgument:&completion atIndex:4];
    animation();
    if(completion) {
       completion();
    }
    }] animateWithDuration:expectedAnimationDuration
                animations:[OCMArg isNotNil]
                completion:OCMOCK_ANY];

  __block BOOL finished = NO;
  [v animateLockWithGestureRecognizer:mockGestureRecognizer 
                           completion:^{
                                        finished = YES;
                                      }];
                                      
  XCTAssertTrue(finished == YES, @"Should finished");
  XCTAssertTrue(CGRectEqualToRect(expectedRect, v.lockImageView.frame), @”Wrong frame”);

  [mockGestureRecognizer verify];
  [partialMockPinView verify]; [partialMockPinView stopMocking];
  [mockView verify]; [mockView stopMocking];
}