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--- pytest_notes [2023/05/05 15:19] – [check if two lists are equal] admin
+++ pytest_notes [2023/12/22 18:50] – [run pytest on the current file from the current file] raju
@@ Line 1: / Line 1: @@
-==== 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>
 ==== test a function that writes output to a file ====
@@ Line 97: / Line 56: @@
 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 ====
@@ Line 105: / Line 93: @@
   * 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/
+  * 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:
@@ Line 110: / Line 99: @@
   * 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
+==== 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