Matchers.hasProperty doesn't appear to work correctly all the time

[GoogleCodeExporter]

I found this when trying to write a test which asserted that the user's 
Principal in a ServletRequest was correctly set. For some reason the matcher 
doesn't return true for this object even though it has the "name" property 
which matches the string value I'm testing for.

I tried to reproduce the test with some other Principal implementation and that 
worked, so I pulled a cut-down version of our own implementation into this test 
case and indeed, the problem still occurs but I can't figure out why anymore.

public class TestMatchers
{
    Matcher<Principal> m = Matchers.hasProperty("name", equalTo("bob"));

    @Test
    public void testSunPrincipal() throws Exception
    {
        Principal p = new PrincipalImpl("bob");
        assertThat(p.getName(), is(equalTo("bob")));
        assertThat(p, is(m));
    }

    @Test
    public void testUserPrincipal() throws Exception
    {
        Mockery mockery = new Mockery();
        final User user = mockery.mock(User.class);
        mockery.checking(new Expectations() {{
            allowing(user).getName(); will(returnValue("bob"));
        }});

        Principal p = new UserPrincipal(user);
        assertThat(p.getName(), is(equalTo("bob")));
        assertThat(p, is(m)); // <- fails here
    }

    private static interface User
    {
        String getName();
    }

    private static class UserPrincipal implements Principal
    {
        private final User user;

        public UserPrincipal(User user)
        {
            this.user = user;
        }

        @Override
        public String getName()
        {
            return user.getName();
        }

        @Override
        public String toString()
        {
            return String.format("UserPrincipal(%s)", user);
        }
    }

}

Original issue reported on code.google.com by trejkaz on 14 Jun 2012 at 12:00