98 lines
4.8 KiB
Python
98 lines
4.8 KiB
Python
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import unittest
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import pytest
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# For this first exercise, it is really important to be clear about how we are importing names for tests.
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# To that end, we are putting a try/catch around imports and throwing specific messages to help students
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# decode that they need to create and title their constants and functions in a specific way.
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try:
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from lasagna import (EXPECTED_BAKE_TIME,
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bake_time_remaining,
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preparation_time_in_minutes,
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elapsed_time_in_minutes)
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# Here, we are separating the constant import errors from the function name import errors
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except ImportError as import_fail:
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message = import_fail.args[0].split('(', maxsplit=1)
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item_name = import_fail.args[0].split()[3]
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if 'EXPECTED_BAKE_TIME' in item_name:
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# pylint: disable=raise-missing-from
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raise ImportError(f'\n\nMISSING CONSTANT --> \nWe can not find or import the constant {item_name} in your'
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" 'lasagna.py' file.\nDid you misname or forget to define it?") from None
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else:
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item_name = item_name[:-1] + "()'"
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# pylint: disable=raise-missing-from
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raise ImportError("\n\nMISSING FUNCTION --> In your 'lasagna.py' file, we can not find or import the"
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f' function named {item_name}. \nDid you misname or forget to define it?') from None
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# Here begins the formal test cases for the exercise.
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class LasagnaTest(unittest.TestCase):
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@pytest.mark.task(taskno=1)
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def test_EXPECTED_BAKE_TIME(self):
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failure_msg = 'Expected a constant of EXPECTED_BAKE_TIME with a value of 40.'
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self.assertEqual(EXPECTED_BAKE_TIME, 40, msg=failure_msg)
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@pytest.mark.task(taskno=2)
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def test_bake_time_remaining(self):
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input_data = [1, 2, 5, 10, 15, 23, 33, 39]
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result_data = [39, 38, 35, 30, 25, 17, 7, 1]
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for variant, (time, expected) in enumerate(zip(input_data, result_data), start=1):
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with self.subTest(f'variation #{variant}', time=time, expected=expected):
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actual_result = bake_time_remaining(time)
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failure_msg = (f'Called bake_time_remaining({time}). '
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f'The function returned {actual_result}, but the tests '
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f'expected {expected} as the remaining bake time.')
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self.assertEqual(actual_result, expected, msg=failure_msg)
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@pytest.mark.task(taskno=3)
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def test_preparation_time_in_minutes(self):
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input_data = [1, 2, 5, 8, 11, 15]
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result_data = [2, 4, 10, 16, 22, 30]
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for variant, (layers, expected) in enumerate(zip(input_data, result_data), start=1):
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with self.subTest(f'variation #{variant}', layers=layers, expected=expected):
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actual_result = preparation_time_in_minutes(layers)
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failure_msg = (f'Called preparation_time_in_minutes({layers}). '
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f'The function returned {actual_result}, but the tests '
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f'expected {expected} as the preparation time.')
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self.assertEqual(actual_result, expected, msg=failure_msg)
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@pytest.mark.task(taskno=4)
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def test_elapsed_time_in_minutes(self):
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layer_data = (1, 2, 5, 8, 11, 15)
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time_data = (3, 7, 8, 4, 15, 20)
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result_data = [5, 11, 18, 20, 37, 50]
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for variant, (layers, time, expected) in enumerate(zip(layer_data, time_data, result_data), start=1):
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with self.subTest(f'variation #{variant}', layers=layers, time=time, expected=expected):
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actual_result = elapsed_time_in_minutes(layers, time)
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failure_msg = (f'Called elapsed_time_in_minutes({layers}, {time}). '
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f'The function returned {actual_result}, but the tests '
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f'expected {expected} as the elapsed time.')
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self.assertEqual(actual_result, expected, msg=failure_msg)
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@pytest.mark.task(taskno=5)
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def test_docstrings_were_written(self):
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"""Validate function.__doc__ exists for each function.
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Check the attribute dictionary of each listed function
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for the presence of a __doc__ key.
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:return: unexpectedly None error when __doc__ key is missing.
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"""
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functions = [bake_time_remaining, preparation_time_in_minutes, elapsed_time_in_minutes]
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for variant, function in enumerate(functions, start=1):
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with self.subTest(f'variation #{variant}', function=function):
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actual_result = function.__doc__
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failure_msg = (f'Called {function.__name__}.__doc__. {actual_result} was returned, '
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f'but the tests expected a docstring for the {function.__name__} function.')
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# Check that the __doc__ key is populated for the function.
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self.assertIsNotNone(actual_result, msg=failure_msg)
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