def METHOD_NAME(self):
    for char in whitespace.whitespace_data.chars:
        fake_src = [
            "src_prepare() {\n",
            f'\tcd "${{S}}"/cpp ||{char}die\n',
            "}\n",
        ]
        fake_pkg = misc.FakePkg("dev-util/diffball-0.5", lines=fake_src)
        r = self.assertReport(self.check, fake_pkg)
        assert isinstance(r, whitespace.BadWhitespaceCharacter)
        assert f"bad whitespace character {repr(char)} on line 2" in str(r)