public void FilterDigit_SequenceNull_ArgumentNullException()
{
// Arrange
IEnumerable <int> source = null;
int digit = 7;
// Assert
Assert.Throws <ArgumentNullException>(() => Task4.FilterDigits(source, digit));
}
public void FilterDigit_IsNegativeDigit_ArgumentException()
{
// Arrange
IEnumerable <int> source = new List <int> {
1, 2, 3, 4, 5, 6, 7, 68, 69, 70, 15, 17
};
int digit = -8;
// Assert
Assert.Throws <ArgumentException>(() => Task4.FilterDigits(source, digit));
}
public void FilterDigit_ReturnedEmptySequence()
{
// Arrange
IEnumerable <int> source = new List <int> {
1, 2, 3, 4, 5, 6, 7, 68, 70, 15, 17
};
int digit = 9;
// Act
IEnumerable <int> result = Task4.FilterDigits(source, digit);
// Assert
Assert.IsTrue(result.Count() == 0);
}
public void FilterDigit_CorrectValues()
{
// Arrange
IEnumerable <int> source = new List <int> {
1, 2, 3, 4, 5, 6, 7, 68, 69, 70, 15, 17
};
int digit = 7;
IEnumerable <int> expected = new List <int> {
7, 70, 17
};
// Act
IEnumerable <int> result = Task4.FilterDigits(source, digit);
// Assert
Assert.IsTrue(expected.SequenceEqual(result));
}
