    @Test
    public void testMatchCoupling_sourcePackage() {

        assertThat(matchCoupling(new CouplingFilter.Builder().sourcePackage("[\\w\\.]+").build(), DEFAULT_COUPLING)).isTrue();
        assertThat(matchCoupling(new CouplingFilter.Builder().sourcePackage("\\d+").build(), DEFAULT_COUPLING)).isFalse();
    }