public void IndexOf_ValueNotInList_CorrectlyReturnsNegativeOne()
{
// Arrange
IReadOnlyList <int> list = new[] { 2, 4, 6, 8 };
// Act
int index = IReadOnlyListExtensions.IndexOf(list, 1);
// Assert
Assert.Equal(-1, index);
}
public void IndexOf_ValueAppearsMultipleTimes_CorrectlyReturnsFirstInstance()
{
// Arrange
IReadOnlyList <int> list = new[] { 2, 4, 6, 8, 4 };
// Act
int index = IReadOnlyListExtensions.IndexOf(list, 4);
// Assert
Assert.Equal(1, index);
}
public void IndexOf_ValueInList_CorrectlyReturnsIndex()
{
// Arrange
IReadOnlyList <int> list = new[] { 6, 4, 1, 8 };
// Act
int index = IReadOnlyListExtensions.IndexOf(list, 1);
// Assert
Assert.Equal(2, index);
}
public void IndexOf_NullList_ThrowsNullReferenceException()
{
// Arrange, Act, and Assert
Assert.Throws <NullReferenceException>(() => IReadOnlyListExtensions.IndexOf(null, 1));
}