test unittest with lists

I want to use a list like I did in test_dir_list with extend and sort to make test_dir_unittest and test_dir_unittest_testcase simpler.

preview

I have these tests by the end of the chapter

open the project

I open a terminal
I change directory to the project
```
cd unittest
```
I open test_unittest.py from the tests folder

I use pytest-watcher to run the tests automatically

uv run pytest-watcher . --now --patterns "**/*.py"

test_dir_unittest_testcase with extend and sort

The attributes and methods of the unittest.TestCase object are the attributes and methods of the unittest object with extra things. I can make the attributes and methods of the unittest.TestCase object by adding the “extra” to the attributes and methods of the unittest object.

RED: make it fail

I add a variable for the attributes and methods of the unittest.TestCase object, then add an assertion for it, in test_dir_unittest

unittest/tests/test_unittest.py

      def test_dir_unittest_testcase(self):
          dir_unittest_testcase = dir(unittest)
          self.assertEqual(
              dir(unittest.TestCase),
              dir_unittest_testcase
          )

          reality = dir(unittest.TestCase)

the terminal is my friend, and shows AssertionError

terminal

AssertionError: Lists differ: [
    '__call__', '__class__', '__delattr__', '_[1726 chars]ass'
] != [
    'BaseTestSuite', 'FunctionTestCase', 'Isol[578 chars]til'
]

GREEN: make it pass

I set maxDiff to None

unittest/tests/test_unittest.py

    def test_dir_unittest_testcase(self):
        self.maxDiff = None
        dir_unittest_testcase = dir(unittest)

I use extend to append the additional elements

unittest/tests/test_unittest.py

    def test_dir_unittest(self):
        dir_unittest = dir(object)
        dir_unittest.extend((
            '__dict__', '__firstlineno__',
            '__module__', '__static_attributes__',
            '__weakref__',
            'can_get_license', 'can_vote',
            'check_age', 'say_hello',
        ))
        self.assertEqual(
            dir(src.unittest.Person),
            dir_unittest
        )

the terminal still shows AssertionError.

I add a call to the sort method

unittest/tests/test_unittest.py

        dir_unittest.extend((
            '__dict__', '__firstlineno__',
            '__module__', '__static_attributes__',
            '__weakref__',
            'can_get_license', 'can_vote',
            'check_age', 'say_hello',
        ))
        dir_unittest.sort()
        self.assertEqual(
            dir(src.unittest.Person),
            dir_unittest
        )

        self.assertEqual(
            dir(src.unittest.Person),
            [
                '__class__', '__delattr__', '__dict__',
                '__dir__', '__doc__', '__eq__',

the test passes because all objects inherit from ‘object’.

REFACTOR: make it better

I remove the other assertion from test_dir_unittest

unittest/tests/test_unittest.py

        dir_unittest.sort()
        self.assertEqual(
            dir(src.unittest.Person),
            dir_unittest
        )

    def test_dir_unittest_instance(self):

I add a git commit message

terminal

git commit -am \
'test_dir_unittest with extend and sort'

All objects inherit attributes and methods from ‘object’.

test_dir_unittest_instance with extend and sort

The attributes and methods of an instance of the Person object are the attributes and methods of the unittest object with extra. Since they are both lists I can make the attributes and methods of an instance of the Person object by adding the “extra” to the attributes and methods of the unittest object.

RED: make it fail

I add a variable for the attributes and methods of an instance of the Person object, then add an assertion for it

unittest/tests/test_unittest.py

    def test_dir_unittest_instance(self):
        dir_unittest_instance = dir(src.unittest.Person)
        self.assertEqual(
            dir(
                src.unittest.Person(
                    first_name='first_name',
                    last_name='last_name',
                    sex='M',
                    year_of_birth=2026,
                )
            ),
            dir_unittest_instance
        )

        self.assertEqual(
            dir(
                src.unittest.Person(
                    first_name='first_name',

the terminal is my friend, and shows AssertionError

terminal

AssertionError: Lists differ: [
    '__c[396 chars]_', 'age', 'can_get_license',
    'can_vote', 'che[96 chars]rth'
] != [
    '__c[396 chars]_', 'can_get_license', 'can_vote',
    'check_age', 'say_hello'
]

with a note about the difference

terminal

Diff is 718 characters long. Set self.maxDiff to None to see it.

GREEN: make it pass

I add self.maxDiff = None

unittest/tests/test_unittest.py

    def test_dir_unittest_instance(self):
        self.maxDiff = None
        dir_unittest_instance = dir(src.unittest.Person)

the terminal is my friend, and shows the difference.

I use extend to append the seven additional elements

unittest/tests/test_unittest.py

    def test_dir_unittest_instance(self):
        self.maxDiff = None
        dir_unittest_instance = dir(src.unittest.Person)
        dir_unittest_instance.extend((
            'age', 'first_name', 'is_citizen',
            'last_name', 'passed_test',
            'sex', 'year_of_birth',
        ))
        self.assertEqual(
            dir(
                src.unittest.Person(
                    first_name='first_name',
                    last_name='last_name',
                    sex='M',
                    year_of_birth=2026,
                )
            ),
            dir_unittest_instance
        )

the terminal still shows AssertionError.

I add a call to the sort method

unittest/tests/test_unittest.py

        dir_unittest_instance.extend((
            'age', 'first_name', 'is_citizen',
            'last_name', 'passed_test',
            'sex', 'year_of_birth',
        ))
        dir_unittest_instance.sort()
        self.assertEqual(
            dir(
                src.unittest.Person(
                    first_name='first_name',
                    last_name='last_name',
                    sex='M',
                    year_of_birth=2026,
                )
            ),
            dir_unittest_instance
        )

        self.assertEqual(
            dir(
                src.unittest.Person(
                    first_name='first_name',

the test passes because all objects inherit from ‘object’.

REFACTOR: make it better

I remove the other assertion from test_dir_unittest_instance

unittest/tests/test_unittest.py

        self.assertEqual(
            dir(
                src.unittest.Person(
                    first_name='first_name',
                    last_name='last_name',
                    sex='M',
                    year_of_birth=2026,
                )
            ),
            dir_unittest_instance
        )


# Exceptions seen

I add a git commit message

terminal

git commit -am \
'test_dir_unittest_instance with extend and sort'

All objects inherit attributes and methods from ‘object’.

close the project

I close test_unittest.py
I click in the terminal where the tests are running
I use q on the keyboard to leave the tests
I change directory to the parent of lists
```
cd ..
```

review

All objects inherit attributes and methods from ‘object’.

code from the chapter

Do you want to see all the CODE I typed in this chapter?

what is next?

I know how to make a Python Test Driven Development environment manually.
I know what a Python module is.
I know how to run tests automatically.
I know what an assertion is.
I know how to make functions.
I know how to make a unittest with strings.
I know how to make functions that take input.
I know what causes TypeError.
I know how to place values in strings.
I know how to make a unittest say hello with f-strings.
I know how to separate tests from solutions.
I know what causes AttributeError.
I know how to make a unittest with an object.
I know that everything in Python is an object.
I know how to use the unittest library.
I know how to use the datetime library.
I know what None is.
I know how to make a unittest with conditions.
I know how Python groups objects into False or True.
I know how to make a Python Test Driven Development environment automatically.
I know how to write programs that make decisions.
I know how to make a Python Test Driven Development environment automatically with variables.
I know how to make a unittest with Exceptions.
I know how to test that an Exception is raised.
I know how to use Exception handlers in programs.
I know how to make a unittest with loops.
I know how to use lists.

Would you like to test list comprehensions?

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