public void GetPermutationsReturnsCorrectListOfPermutations() { var actualPermutations = stringProblems.GetPermutations("aab"); Assert.AreEqual(3, actualPermutations.Count()); Assert.IsTrue(actualPermutations.Contains("aab")); Assert.IsTrue(actualPermutations.Contains("aba")); Assert.IsTrue(actualPermutations.Contains("baa")); }