How to Pass Arguments Back from Mocked Methods in Java?

Returning Passed Arguments from Mocked Methods

In certain scenarios, it may be desirable for a mocked method to return the same argument that was passed to it. Mockito, a well-known mocking framework for Java, provides various approaches to achieve this behavior:

Mockito 1.9.5 with Java 8

Utilizing lambda expressions, you can now succinctly define the behavior:

<code class="java">when(myMock.myFunction(anyString())).thenAnswer(i -> i.getArguments()[0]);</code>

Older Mockito Versions

Alternatively, for older versions of Mockito, you can create a custom Answer:

<code class="java">when(mock.myFunction(anyString())).thenAnswer(new Answer<String>() {
    @Override
    public String answer(InvocationOnMock invocation) throws Throwable {
        Object[] args = invocation.getArguments();
        return (String) args[0];
    }
});</code>

This Answer implementation retrieves the first argument from the invocation and returns it, effectively passing back the same string that was passed to the mocked method.

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