public void Filter_FilterShouldWork() { // Arrange StackArray <int> sut = new StackArray <int> { 2, 8, 7, 12, 23, 14, 1, 25, 17, 5 }; int[] expected = { 5, 14, 12, 7, 8 }; // Act IEnumerable <int> actual = sut.Filter(item => item >= 5 && item <= 14); // Assert Assert.Equal(expected, actual); }