public void BuildCorrectMultipleClause(IEnumerable <Clause> expectedClauses, Filter filter) { var clauses = new ClauseFactory(_fakeValidColumns).Build(filter); var expectedClausesHash = new HashSet <string>(expectedClauses.Select(c => c.ToString())); expectedClausesHash.ExceptWith(clauses.Select(c => c.ToString())); Assert.Empty(expectedClausesHash); }