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- 1.1
- 1.2
- 1.3
- Exercises
- 2.1
- 2.2
- 2.3
- 2.4
- 2.5
- 2.6
- 2.7
- Instructions for Trainers
- 3.1
- 3.2
- 3.3
- 3.4
The rows in the table got messed up! Match the test strategies with the correct descriptions.
| test strategy | description |
|---|---|
| Unit Test | files and examples that help with testing |
| Acceptance Test | collection of tests for a software package |
| Mock | relative amount of code tested |
| Fixture | tests a single module, class or function |
| Test suite | prepare tests and clean up afterwards |
| Test data | replaces a complex object to make testing simpler |
| Test coverage | tests functionality from the users point of view |
This exercise works better when each element from the table is printed on a paper card.
Create a new module conftest.py with a string variable that contains a sentence with lots of special characters:
sample = """That #&%$* program still doesn't work!I already de-bugged it 3 times, and still numpy.array keeps raising AttributeErrors. What should I do?"""Create a function that returns a mobydick.TextCorpus object with the sample text above. Use the following as a header:
@pytest.fixturedef sample_corpus(): ...Now create a module test_sample.py with a function that uses the fixture:
def test_sample_text(sample_corpus): assert sample_corpus.n_words == 77Execute the module with pytest. Note that you do not need to import conftest. Pytest does that automatically.
Create fixtures for the two text corpora in the files mobydick_full.txt and mobydick_summary.txt as well.
Create a fixture in conftest.py that uses another fixture:
from mobydick import WordCounter@pytest.fixturedef counter(mobydick_summary): return WordCounter(mobydick_summary)Write a simple test that makes sure the fixture is not None
The program works perfectly?You will probably agree, that the sentence contains four words.
That #&%$* program still doesn't work!\nI already de-bugged it 3 times, and still numpy.array keeps raising AttributeErrors. What should I do?You may find the answer to this question less obvious. It depends on how precisely the special characters are interpreted.
Writing automated tests for your software helps you to:
- get clear on what you want the program to do.
- identify gaps in the requirements.
- prove the presence of bugs (not their absence!).
- help you during refactoring.
This tutorial helps you to learn automated testing in Python 3 using the py.test framework.
- Sources for this tutorial: github.com/krother/python_testing_tutorial.
- PDF and EPUB versions: www.gitbook.io/book/krother/python-testing-tutorial
Feedback and comments are welcome at:
2018 Magdalena & Kristian Rother
Released under the conditions of a Creative CommonsAttribution License 4.0.
Kristian Rother, Magdalena Rother, Daniel Szoska
I used a very similar lesson plan to conduct a training at EuroPython 2014. The audience consisted of about 60 Python programmers, including beginners and seasoned developers.
| module | topic | time |
|---|---|---|
| warm-up | introduce the Moby Dick theme | 5' |
| warm-up | icebreaker activity | 5' |
| warm-up | announce training objectives | 5' |
| part 1 | Writing automatic tests in Python | 45 |
| warm-up | methods in the unittest module | 5 |
| new content | presentation: Unit Tests, Integration Tests, and Acceptance Tests | 15 |
| application | challenges 1.1 - 1.5 | 20 |
| wrap-up | Q & A | 5 |
| part 2 | Integration and Acceptance Tests (45') | |
| warm-up | quiz on test strategies | 10' |
| new content | presentation on Test-Driven-Development | 10 |
| application | challenges 2.1 - 3.3 | 20' |
| wrap-up | Q & A | 5 |
| break | 10 | |
| part 3 | Tests data and test suites (45') | |
| warm-up | multiple choice questions | 10' |
| new content | presentation on test suites | 10 |
| application | exercises 4, 5, 6 | 20' |
| wrap-up | Q & A | 5 |
| summary | Benefits of testing (25') | |
| transfer | group discussion on benefits of testing | 20 |
| finishing | summary | 4 |
| finishing | goodbye | 1' |
Programmers who have already written programs on their own but would like to learn about automated software testing.
During the tutorial participants will implement automatic test functions that pass for the Moby Dick example. using the unittest module within 20'.
| module | topic | time |
|---|---|---|
| warm-up | hello | 1' |
| warm-up | question: How do you know that your code works? | 4' |
| motivation | explain the benefit: You will be able to check in a few seconds that your program works. | 1 |
| new content | overview of the code example | 1 |
| new content | run the code example; collective analysis | 15' |
| application | write code using the task description | 20' |
| wrap-up | discuss pros and cons of testing | 15' |
| wrap-up | point to materials | 2' |
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