public void CalculateLargestAreaSize() { // Arrange var input = new List <string> { "1, 1", "1, 6", "8, 3", "3, 4", "5, 5", "8, 9" }; var sut = new Day06(); // Act var result = sut.CalculateLargestAreaSize(input); // Assert result.Should().Be(17); }