public void CreateSequence_WhenLengthIsZero_ShouldReturnAnEmptyCollection()
{
// Arrange
var subject = new NaturalsSequenceGenerator();
// Act
var result = subject.CreateSequence(0);
// Assert
CollectionAssert.IsEmpty(result);
}
public void CreateSequence_WhenLengthIsOne_ShouldReturnTheNumberOneInACollection()
{
// Arrange
var subject = new NaturalsSequenceGenerator();
// Act
var result = subject.CreateSequence(1);
// Assert
CollectionAssert.AreEqual(new int[] { 1 }, result);
}
public void CreateSequence_WhenLengthIsFive_ShouldReturnTheNumbersOneToFive()
{
// Arrange
var subject = new NaturalsSequenceGenerator();
// Act
var result = subject.CreateSequence(5);
// Assert
CollectionAssert.AreEqual(new int[] { 1, 2, 3, 4, 5 }, result);
}
public void CreateSequence_WhenLengthIsLessThanZero_ShouldThrowAnArgumentOutOfRangeException()
{
// Arrange
var subject = new NaturalsSequenceGenerator();
// Act
TestDelegate act = () => subject.CreateSequence(-1);
// Assert
var ex = Assert.Throws<ArgumentOutOfRangeException>(act);
Assert.That(ex.ParamName, Is.EqualTo("length"));
Assert.That(ex.Message, Is.Not.Null);
}
