public void ShouldThrowIfExtensionIsNull()
{
// Given
FilePath path = new FilePath("temp/hello.txt");
// When
TestDelegate test = () => path.AppendExtension(null);
// Then
Assert.Throws<ArgumentNullException>(test);
}
public void CanAppendExtensionToPath(string extension, string expected)
{
// Given
FilePath path = new FilePath("temp/hello.txt");
// When
path = path.AppendExtension(extension);
// Then
Assert.AreEqual(expected, path.ToString());
}
