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A test run prints this. How many tests passed? …
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A test run prints this.
text
..F.E
======================================================================
FAIL: test_edges (__main__.TestGrade)
AssertionError: 'C' != 'B'
ERROR: test_empty (__main__.TestAverage)
ZeroDivisionError: division by zero
Ran 5 tests in 0.001s
FAILED (failures=1, errors=1)How many tests passed? What is the difference between the failure and the error? For test_edges, which value is the answer of the function?
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
Plan. Read the line of letters: each character is one test. A dot is a pass, F is a failure, and E is an error. The letters are ., ., F, ., E.
- Passed: 3 tests (the three dots). The summary says 5 tests, with 1 failure and 1 error.
- Failure:
test_edgesran, and anassertEqualfound that the answer was not the expected one. - Error:
test_emptycrashed with aZeroDivisionError: the code under test, or the test, raised an error that was not expected. The function divides by zero for an empty list. - In
AssertionError: 'C' != 'B', the first value is the answer of the function and the second is the expected one. So the function gaveC, and the test expectedB: a bug at an edge of the grade function.
Answer: 3 passed. A failure is a wrong answer, an error is a crash. The function gave C.
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