def METHOD_NAME(self):
    fake_src = [
        "# This is our first fake ebuild\n",
        " # This line contains a leading whitespace\n",
        "# That's it for now\n",
    ]
    fake_pkg = misc.FakePkg("dev-util/diffball-0.5", lines=fake_src)
    r = self.assertReport(self.check, fake_pkg)
    assert isinstance(r, whitespace.WhitespaceFound)
    assert r.lines == (2,)
    assert "leading whitespace" in str(r)