@Test
public void addTotalRelationOfWeightZeroWorksAsExpected() {

    final Map<String, Integer> weightedSubjectIds = weighSubjectIds(0);
    underTest.addTotalRelationOfWeightZero(permissions, subjectIds);
    assertThat(underTest)
            .hasSameSizeAs(permissions)
            .containsEntry("READ", weightedSubjectIds)
            .containsEntry("WRITE", weightedSubjectIds);
}