IOS - Testing Devices Asynchronous Code

Question

Part of the method I'm trying to test is as follows:

- (void)configureTableFooterView {
    dispatch_async(dispatch_get_main_queue(), ^{
        self.tableView.tableFooterView = nil;

        if ([self.parser.resultSet isLastPage]) {
            return;
        }
    });
}

I wrote unit test as follows:

- (void)testTableFooterViewConfigurationAfterLastPageLoaded {

    id mockTableView = OCMClassMock([GMGFlatTableView class]);

    OCMExpect([mockTableView setTableFooterView:[OCMArg isNil]]);

    id resultSet = OCMClassMock([GMGResultSetInfo class]);

    OCMStub([resultSet isLastPage]).andReturn(YES);

    OCMStub([self.mockParser resultSet]).andReturn(resultSet);

    id partialMockSUT = OCMPartialMock(self.sut);

    OCMStub([partialMockSUT tableView]).andReturn(mockTableView);

    [self.sut configureTableFooterView];

    OCMVerifyAllWithDelay(mockTableView, 2.0);

    //OCMVerifyAllWithDelay(partialMockSUT, 2.0); 
}

I have another test in the same class that tests the same things with the help of a dispatch_async call in the main thread. The test expectations and test setup in this test are consistent with this. While this test passes, it gets stuck in an endless loop at the check delay stage.

Interestingly, if I only run this 1 test, it passes without any problems. Its the only one when this test runs with other tests that I see in this problem.

UPDATE:

In unit test, execute block passed in queue with dispatch_asyc

This is a much more relevant article. However, this happens almost exactly the same as the original testing method:

- (void)testTableFooterViewConfigurationAfterLastPageLoaded {

    id mockTableView = OCMClassMock([GMGFlatTableView class]);

    OCMExpect([mockTableView setTableFooterView:[OCMArg isNil]]);

    id resultSet = OCMClassMock([GMGResultSetInfo class]);

    OCMStub([resultSet isLastPage]).andReturn(YES);

    OCMStub([self.mockParser resultSet]).andReturn(resultSet);

    id partialMockSUT = OCMPartialMock(self.sut);

    OCMStub([partialMockSUT tableView]).andReturn(mockTableView);

    [self.sut configureTableFooterView];

    [[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01]];

    OCMVerifyAll(mockTableView);
}

NSRunLoop EXC_BAD_ACCESS , !

Answer 1

dispatch_async . . , .