claude
2684095e2f
Co-authored-by: claude <claude@jpaul.io> Co-committed-by: claude <claude@jpaul.io>
76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
"""Reference test suite for the Module 13 lab. Peek only after you've tried it yourself.
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Named `reference_test_tasks.py` (not `test_*.py`) on purpose, so `python -m unittest discover`
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does NOT pick it up automatically. To run it directly from the tasks-app folder:
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python -m unittest path/to/reference_test_tasks.py
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It assumes `tasks.py` is importable (run it from the tasks-app directory, or copy it there).
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The point of this file is to show the difference between a test that asserts CURRENT BEHAVIOR
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(a tautology that passes against the bug) and a test that encodes INTENT (and fails until the
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bug is fixed).
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"""
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import unittest
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from tasks import TaskList
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class TestTaskBasics(unittest.TestCase):
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def test_add_appends_a_task(self):
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tl = TaskList()
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tl.add("write the tests")
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self.assertEqual(len(tl.tasks), 1)
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self.assertEqual(tl.tasks[0].title, "write the tests")
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self.assertFalse(tl.tasks[0].done)
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def test_complete_marks_done(self):
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tl = TaskList()
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tl.add("a")
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tl.complete(0)
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self.assertTrue(tl.tasks[0].done)
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def test_pending_excludes_completed(self):
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tl = TaskList()
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tl.add("a")
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tl.add("b")
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tl.complete(0)
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self.assertEqual([t.title for t in tl.pending()], ["b"])
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class TestPendingCount(unittest.TestCase):
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def test_count_with_nothing_done_is_a_tautology(self):
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# This passes even with the bug, because when nothing is completed
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# "total" and "pending" are the same number. It proves almost nothing.
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tl = TaskList()
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tl.add("a")
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tl.add("b")
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self.assertEqual(tl.pending_count(), 2)
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def test_count_reflects_intent_after_completing_one(self):
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# This encodes what `count` is FOR: how many tasks are still pending.
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# It FAILS against the planted bug (pending_count returns len(self.tasks)),
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# and passes once pending_count returns len(self.pending()).
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tl = TaskList()
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tl.add("a")
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tl.add("b")
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tl.complete(0)
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self.assertEqual(tl.pending_count(), 1)
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def test_count_of_all_done_is_zero(self):
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tl = TaskList()
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tl.add("a")
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tl.complete(0)
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self.assertEqual(tl.pending_count(), 0)
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# The fix, for reference:
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#
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# def pending_count(self) -> int:
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# return len(self.pending())
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if __name__ == "__main__":
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unittest.main()
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