def test_copy_to_file(self):
with self.assertRaises(ValueError) as cm:
files.copy('~/.bashrc')
error_message = str(cm.exception)
self.assertEquals(error_message, "'~/.bashrc' is not a directory")
def test_copy_to_empty(self):
with self.assertRaises(ValueError) as cm:
files.copy('')
error_message = str(cm.exception)
self.assertEquals(error_message, 'path cannot be empty')