BLOG - Date Range Tests

DateRangeTests.cs

public class DateRangeTests
{
	[TestFixture]
	public class when_instantiating_date_ranges
	{

		[Test]
		public void then_should_set_start_date_given_start_date()
		{
			// Arrange // Act
			var start = DateTime.Parse("1/1/2015");
			var dateRange = new DateRange(start, DateTime.Parse("12/31/2015"));

			// Assert
			Assert.That(dateRange.Start, Is.EqualTo(start));
		}

		[Test]
		public void then_should_set_end_date_given_and_end_date()
		{
			// Arrange // Act
			var end = DateTime.Parse("1/1/2015");
			var dateRange = new DateRange(new DateTime(), end);

			// Assert
			Assert.That(dateRange.End, Is.EqualTo(end));
		}

		[Test]
		public void then_should_throw_argument_exception_given_start_date_after_end_date()
		{
			// Arrange // Act // Assert
			Assert.Throws<ArgumentException>(() => new DateRange(DateTime.Parse("12/31/2015"), DateTime.Parse("12/1/2015")));
		}
	}

	[TestFixture]
	public class when_creating_new_range_with_start_date_and_positive_days
	{

		[Test]
		public void then_should_create_range_with_end_date_1_1_2016_given_start_date_1_1_2015_and_365_days()
		{
			// Arrange // Act
			var range = DateRange.FromDays(DateTime.Parse("1/1/2015"), 365);

			// Assert
			Assert.That(range.End, Is.EqualTo(DateTime.Parse("1/1/2016")));
		}
	}
	[TestFixture]
	public class when_creating_new_range_with_start_date_and_negative_days
	{

		[Test]
		public void then_should_create_range_with_start_date_1_1_2014_given_start_date_1_1_2015_and_negative_365_days()
		{
			// Arrange // Act
			var range = DateRange.FromDays(DateTime.Parse("1/1/2015"), -365);

			// Assert
			Assert.That(range.Start, Is.EqualTo(DateTime.Parse("1/1/2014")));
		}

		[Test]
		public void then_should_create_range_with_end_date_equal_to_start_date_given_start_date_1_1_2015_and_negative_365_days()
		{
			// Arrange // Act
			var start = DateTime.Parse("1/1/2015");
			var range = DateRange.FromDays(start, -365);

			// Assert
			Assert.That(range.End, Is.EqualTo(start));
		}
	}

	[TestFixture]
	public class when_comparing
	{

		[Test]
		public static void then_equals_should_return_true_given_same_range()
		{
			// Arrange
			var range1 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("12/31/2015"));
			var range2 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("12/31/2015"));

			// Act
			var result = range1.Equals(range2);

			// Assert
			Assert.That(result, Is.True);
		}

		[Test]
		public static void then_equals_should_return_false_given_different_range()
		{
			// Arrange
			var range1 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("12/31/2015"));
			var range2 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("1/1/2016"));

			// Act
			var result = range1.Equals(range2);

			// Assert
			Assert.That(result, Is.False);
		}

		[Test]
		public static void then_equals_should_return_false_given_second_range_null()
		{
			// Arrange
			var range1 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("12/31/2015"));
			DateRange? range2 = null;

			// Act
			var result = range1.Equals(range2);

			// Assert
			Assert.That(result, Is.False);
		}

		[Test]
		public void then_equal_operator_should_be_true_if_start_and_end_dates_are_the_same()
		{
			// Arrange
			var range1 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("12/31/2015"));
			var range2 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("12/31/2015"));

			// Act 
			var result = range1 == range2;

			// Assert
			Assert.That(result, Is.True);
		}

		[Test]
		public void then_not_equal_operator_should_be_true_if_start_and_end_dates_are_not_the_same()
		{
			// Arrange
			var range1 = new DateRange(DateTime.Parse("1/2/2015"), DateTime.Parse("12/31/2015"));
			var range2 = new DateRange(DateTime.Parse("1/1/2015"), DateTime.Parse("12/31/2015"));

			// Act 
			var result = range1 != range2;

			// Assert
			Assert.That(result, Is.True);
		}
	}

	[TestFixture]
	public class when_checking_in_range
	{

		[Test]
		public void then_should_return_true_given_date_between_start_and_end()
		{
			// Arrange
			var range = DateRange.FromDays(DateTime.Parse("2015-07-23"), 14);

			// Act
			var result = range.InRange(DateTime.Parse("2015-07-30"));

			// Assert
			Assert.That(result, Is.True);
		}

		[Test]
		public void then_should_return_false_given_date_not_between_before_start()
		{
			// Arrange
			var range = DateRange.FromDays(DateTime.Parse("2015-07-23"), 14);

			// Act
			var result = range.InRange(DateTime.Parse("2015-07-20"));

			// Assert
			Assert.That(result, Is.False);
		}

		[Test]
		public void then_should_return_false_given_date_not_after_end()
		{
			// Arrange
			var range = DateRange.FromDays(DateTime.Parse("2015-07-23"), 14);

			// Act
			var result = range.InRange(DateTime.Parse("2015-08-07"));

			// Assert
			Assert.That(result, Is.False);
		}
	}
}