mockito - how to mock different behaviors for different arguments

Question

I want a simple mock to behave one way when called with a given argument, and another when called with everything else.

I've tried variations on this:

when(this.mockWebElement.findElement(not(eq(By.xpath("./td[1]"))))).thenReturn(this.mockWebElement);
when(this.mockWebElement.getText()).thenReturn("someString");

when(this.mockWebElement.findElement(By.xpath("./td[1]"))).thenReturn(dateMockElement);
when(dateMockElement.getText()).thenReturn("8/1/2014", "7/1/2014", "6/1/2014", "5/1/2014");

The call to getText(By.xpath("./td[1]")) always returns "someString". I've also tried and(eq(any(By.class)), not(eq(By.xpath("./td[1]"))).

Answer 1

Using your code as a basis, the following test passed for me:

@Before
public void setUp() throws Exception {
    MockitoAnnotations.initMocks(this);
}

    @Mock private WebElement mockWebElement;
    @Mock private WebElement dateMockElement;

    @Test
    public void testX() throws Exception {
        when(this.mockWebElement.findElement(not(eq(By.xpath("./td[1]"))))).thenReturn(this.mockWebElement);
        when(this.mockWebElement.getText()).thenReturn("someString");

        when(this.mockWebElement.findElement(By.xpath("./td[1]"))).thenReturn(dateMockElement);
        when(dateMockElement.getText()).thenReturn("8/1/2014", "7/1/2014", "6/1/2014", "5/1/2014");

        WebElement w = mockWebElement.findElement(By.xpath("./td[1]"));
        String x= w.getText();
        assertEquals("8/1/2014", x);
    }

Since you haven't shown the rest of the test, I'm assuming the error is in the rest of your plumbing of the actual test setup and execution.