boolean matchModification(MaterialRevisions materialRevisions) {
        if (StringUtils.isEmpty(this.matcher)) {
            return false;
        }
        return materialRevisions.containsMyCheckin(new Matcher(matcher));
    }
@Test
    void shouldNotMatchWhenUserDidNotSetUpTheMatcher() {
        materialRevisions = new MaterialRevisions(new MaterialRevision(MaterialsMother.svnMaterial(), aCheckIn("100", "readme")));
        assertThat(new User("UserName", new String[]{null}, "user@mail.com", true).matchModification(materialRevisions)).isFalse();
        assertThat(new User("UserName", new String[]{""}, "user@mail.com", true).matchModification(materialRevisions)).isFalse();
    }