def test_expand_contraction_empty_input(self):
# Setup
input_text = ''
expected_output = ''
# Actual call
output_text = expand_contraction(input_text)
# Asserts
self.assertEqual(output_text, expected_output)
def test_expand_contraction_no_contraction(self):
# Setup
input_text = 'Hello world'
expected_output = 'Hello world'
# Actual call
output_text = expand_contraction(input_text)
# Asserts
self.assertEqual(output_text, expected_output)
def test_expand_contraction_all_contractions(self):
# Setup
input_text = "cannot isn't ain't couldn't"
expected_output = 'cannot is not are not could not'
# Actual call
output_text = expand_contraction(input_text)
# Asserts
self.assertEqual(output_text, expected_output)
def test_expand_contraction(self):
# Setup
input_text = "This isn't a test"
expected_output = 'This is not a test'
# Actual call
output_text = expand_contraction(input_text)
# Asserts
self.assertEqual(output_text, expected_output)