public void ISBN_GivenValidISBN_Then_ItShouldReturnTrue(string isbn)
{
// Arrange
var sut = new ISBNChecker();
// Act
var isValidISBN = sut.IsValidISBN(isbn);
// Assert
Assert.That <bool>(isValidISBN, Is.True);
}
public void ISBN_GivenAnInvalidISBN_Then_ItShouldReturnFalse(string invalidISBN)
{
// Arrange
var sut = new ISBNChecker();
// Act
var isValidISBN = sut.IsValidISBN(invalidISBN);
// Assert
Assert.That <bool>(isValidISBN, Is.False);
}