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pytest_notes [2023/05/05 15:22] – [check if two lists are equal] adminpytest_notes [2023/12/28 01:31] (current) – [who wrote pytest] raju
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-==== check if two lists are equal ==== +==== tasks ==== 
-tags | compare lists +  * [[check if two lists are equal]]
-<code> +
-$ cat compare_lists.py +
-def test_compare_lists_fail(): +
-    list_got = [2, 3, 4] +
-    list_expected = [1, 2, 3] +
-    assert list_got == list_expected, "lists do not match" +
- +
-def test_compare_lists_success(): +
-    list_got = [1, 2, 3] +
-    list_expected = [1, 2, 3] +
-    assert list_got == list_expected, "lists do not match" +
-</code> +
- +
-<code> +
-$ python -m pytest compare_lists.py +
-==================================================== test session starts ==================================================== +
-platform win32 -- Python 3.11.3, pytest-7.1.2, pluggy-1.0.0 +
-... +
-plugins: anyio-3.5.0, hypothesis-6.29.3 +
-collected 2 items +
- +
-compare_lists.py F.                                                                                                    [100%] +
- +
-========================================================= FAILURES ========================================================== +
-__________________________________________________ test_compare_lists_fail __________________________________________________ +
- +
-    def test_compare_lists_fail(): +
-        list_got = [2, 3, 4] +
-        list_expected = [1, 2, 3] +
->       assert list_got == list_expected, "lists do not match" +
-E       AssertionError: lists do not match +
-E       assert [2, 3, 4] == [1, 2, 3] +
-E         At index 0 diff: 2 != 1 +
-E         Use -v to get more diff +
- +
-compare_lists.py:4: AssertionError +
-================================================== short test summary info ================================================== +
-FAILED compare_lists.py::test_compare_lists_fail - AssertionError: lists do not match +
-================================================ 1 failed, 1 passed in 0.16s ================================================ +
-</code> +
- +
-Ref: +
-  * https://stackoverflow.com/questions/46914222/how-can-i-assert-lists-equality-with-pytest+
  
 ==== test a function that writes output to a file ==== ==== test a function that writes output to a file ====
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 tags | run pytest from main function, pytest run parameterized test tags | run pytest from main function, pytest run parameterized test
 +
 +==== assert actual expected template ====
 +
 +template 1
 +
 +<code>
 +assert Actual == Expected,\
 +    'Expected = {}, Actual = {}'.format(Expected, Actual)
 +</code>
 +
 +template 2
 +
 +<code>
 +from pandas.util.testing import assert_frame_equal
 +assert_frame_equal(df_actual, df_expected)
 +</code>
 +
 +template 3
 +
 +<code>
 +import pytest
 +@pytest.mark.parametrize('input, expected_output', [
 +    ('foo', bar),
 +    ('foo2', bar2),
 +])
 +def test_fancy_func(input, expected_output):
 +    got = fancy_func(input)
 +    assert got == expected_output, 'Expected = {}, got = {}'.format(expected_output, got)
 +</code>
  
 ==== useful links ==== ==== useful links ====
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   * To get it from PyPI - https://pypi.python.org/pypi/pytest   * To get it from PyPI - https://pypi.python.org/pypi/pytest
   * T. Ben Thompson's python testing set up - http://tbenthompson.com/post/how_i_test/   * T. Ben Thompson's python testing set up - http://tbenthompson.com/post/how_i_test/
 +  * https://docs.pytest.org/en/latest/how-to/assert.html#assertions-about-expected-exceptions - shows how to check whether the code is throwing exceptions or not.
  
 Links related to parameterization: Links related to parameterization:
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   * Parametrizing tests - https://docs.pytest.org/en/latest/example/parametrize.html   * Parametrizing tests - https://docs.pytest.org/en/latest/example/parametrize.html
   * parametrizing tests where functions have default arguments - https://stackoverflow.com/questions/35844791/how-to-write-a-test-for-a-function-with-optional-arguments   * parametrizing tests where functions have default arguments - https://stackoverflow.com/questions/35844791/how-to-write-a-test-for-a-function-with-optional-arguments
 +
 +==== books on pytest ====
 +  * pytest Quick Start Guide by Bruno Oliveira, published by Packt - https://github.com/PacktPublishing/pytest-Quick-Start-Guide
 +  * Python Testing with pytest: Simple, Rapid, Effective, and Scalable 1st Edition by Brian Okken - https://www.amazon.com/Python-Testing-pytest-Effective-Scalable/dp/1680502409/
 +
 +==== who wrote pytest ====
 +  * https://github.com/pytest-dev/pytest/blob/master/AUTHORS
 +
pytest_notes.1683300166.txt.gz · Last modified: 2023/05/05 15:22 by admin