public void TestIsProperSubsetOf() { var set = new TestSet <int> { 1, 2, 3, 4 }; Assert.False(set.IsProperSubsetOf(new[] { 3, 4, 5 })); Assert.True(set.IsProperSubsetOf(new[] { 1, 2, 3, 4, 5 })); Assert.False(set.IsProperSubsetOf(new[] { 1, 2, 3, 4 })); }