mocking – Page 3 – Tarik Billa

stubbing a function using jest

January 3, 2024 by Tarik

With jest you should use jest.spyOn: jest .spyOn(jQuery, “ajax”) .mockImplementation(({ success }) => success([ 1, 2, 3 ])); Full example: const spy = jest.fn(); const payload = [1, 2, 3]; jest .spyOn(jQuery, “ajax”) .mockImplementation(({ success }) => success(payload)); jQuery.ajax({ url: “https://example.api”, success: data => spy(data) }); expect(spy).toHaveBeenCalledTimes(1); expect(spy).toHaveBeenCalledWith(payload); You can try live example on codesandbox: … Read more

How to mock Symfony 2 service in a functional test?

January 1, 2024 by Tarik

Mocking using Moq in c#

December 30, 2023 by Tarik

Classic example which demonstrates that if you cannot unit test a particular component, REFACTOR it! This is why I love what any mocking framework enforces you to do – write decoupled code. In your example, the ProductBusiness class is tightly coupled with the ProductDataAccess class. You could decouple it using (like most of the answers … Read more

What’s the difference between mock, stub, and factory girl?

December 27, 2023 by Tarik

You could think of a mock (or double) as a fake object. When you’re testing and need to work with an object that isn’t easily usable inside your test, you could use a mock as an approximation for how you expect that object to behave and work around it. Stubs can be used in a … Read more

Expecting anything as parameter to mock using EasyMock

December 26, 2023 by Tarik

To accept any object as parameter: mock.send(anyObject()); (You may need to cast the expression to the desired type.) In addition, to accept any object of a specific type, use: mock.send(isA(SomeObject.class));

mockito verify interactions with ArgumentCaptor

December 25, 2023 by Tarik

I recommend using Mockito’s Hamcrest integration to write a good, clean matcher for it. That allows you to combine the verification with detailed checking of the passed argument: import static org.mockito.hamcrest.MockitoHamcrest.argThat; verify(mock, times(1)).someMethod(argThat(personNamed(“Bob”))); Matcher<Person> personNamed(final String name) { return new TypeSafeMatcher<Person>() { public boolean matchesSafely(Person item) { return name.equals(item.getName()); } public void describeTo(Description description) { … Read more

What should I consider when choosing a mocking framework for .Net [closed]

December 23, 2023 by Tarik

So what questions should I by asking about the project and myself to help decide on the best mocking framework to use in a given case? The questions you should be asking about the project is: Has the project been developed with the SOLID principles, or not? Is this a project that has loose coupling … Read more

Mocking internal classes with Moq for unit testing

December 21, 2023 by Tarik

You could make internals visible to Moq by adding InternalsVisibleToAttribute in your project’s assembly.cs, like this: [assembly: InternalsVisibleTo(“DynamicProxyGenAssembly2”)] Why “DynamicProxyGenAssembly2” and not “Moq”? It’s the name of dynamic assembly created to contain dynamically generated proxy types (all of this is handled by yet another library, Castle’s DynamicProxy) which is used by Moq. So you expose … Read more

What are the advantages of Mocha over RSpec’s built in mocking framework? [closed]

December 20, 2023 by Tarik

Ruby mocking frameworks have evolved a lot since this question has been asked in 2009. So here is a little 2013 comparison: Expectations with Rspec-mocks: expect(user).to receive(:say_hello) with Mocha: user.expects(:say_hello).once Stubbing an object with Rspec-mocks: user = double(name: ‘John Doe’) with Mocha: user = stub(name: ‘John Doe’) Stubbing anything with Rspec-mocks: User.any_instance.stub(:name).and_return(‘John Doe’) with Mocha: … Read more

How can I mock a method in easymock that shall return one of its parameters?

December 20, 2023 by Tarik

Well, the easiest way would be to just use the Capture in the IAnswer implementation… when doing this inline you have to declare it final of course. MyService mock = createMock(MyService.class); final Capture<ParamAndReturnType> myCapture = new Capture<ParamAndReturnType>(); expect(mock.someMethod(capture(myCapture))).andAnswer( new IAnswer<ParamAndReturnType>() { @Override public ParamAndReturnType answer() throws Throwable { return myCapture.getValue(); } } ); replay(mock) This … Read more