NSError** mocking with OCMock 3

gistfile1.m

- (void)testMethodExpectingNoError
{
  id someObject = [self someMethodThatReturnsAnExpectedObject]; 
  id mockDependencuy = OCMClassMock([DependencyToBeMocked class]);
  OCMStub([mockDependency someMethodWithErrorRef:[OCMArg anyObjectRef]).andReturn(someObject);
  
  NSError * error = nil;
  id someReturnedValue =[self.objectUnderTest someMethodWithErrorRef:&error]:
  
  XCTAssertNotNil(someReturnedValue);
  XCTAssertNil(error);
}

- (void)testMethodExpectingAnError
{
  id mockDependencuy = OCMClassMock([DependencyToBeMocked class]);
  void (^invocationBlock)(NSInvocation*) = ^void(NSInvocation* invocation) {
    NSError * __autoreleasing *anError = nil;
    [invocation getArgument:&anError atIndex:2];
    *anError = [NSError errorWithDomain:@"SomeDomain" code:1234 userInfo:aUserInfoDictionaryOrNil];
  };
  OCMStub([mockDependency someErrorWithErrorRef:[OCMArg anyObjectRef]).andDo(invocationBlock).andReturn(nil);
  
  NSError * error = nil;
  id someReturnedValue =[self.objectUnderTest someMethodWithErrorRef&error]:
  
  XCTAssertNil(someReturnedValue);
  XCTAssertNotNil(error);
}