def test_to_upper_empty_input(self):
# Setup
input_text = ''
expected_output = ''
# Actual call
output_text = to_upper(input_text)
# Asserts
self.assertEqual(output_text, expected_output)
def test_to_upper_lower_input(self):
# Setup
input_text = 'hello'
expected_output = 'HELLO'
# Actual call
output_text = to_upper(input_text)
# Asserts
self.assertEqual(output_text, expected_output)
