Multiple Versions in a File

Oct 13, 2025 by pynkocean.com 76 views

Introduction

The test_checkers.py file in the test directory of a project is crucial for ensuring the correctness of the checkers used in the project. Currently, it contains a MyFakeChecker class that tests two essential aspects: ignore patterns and version number parsing. However, with the recent changes introduced in #4911, the checkers can now support finding multiple versions of a single product during a run. This article aims to enhance the test_checkers.py file to cover new situations, specifically testing the functionality of finding multiple versions of a single product.

Current Test Cases

The MyFakeChecker class in test/test_checkers.py currently tests two things:

Ignore Patterns: This test case checks whether the ignore patterns are working correctly. It runs the test checker against a single string and then checks the first element of the returned list against the expected return value.
Version Number Parsing: This test case checks whether the version number parsing is working correctly. It also runs the test checker against a single string and then checks the first element of the returned list against the expected return value.

New Test Cases

With the recent changes introduced in #4911, there is a need to add new test cases to ensure that the checkers can find multiple versions of a single product during a run. The following are the new test cases that need to be added:

Test Case 1: Multiple Versions in a File

When the file contains version strings A and B, does the returned list contain version numbers A and B?

This test case is essential to ensure that the checkers can correctly identify multiple versions of a single product in a file. The test should run the test checker against a file containing version strings A and B and then check the returned list to ensure that it contains version numbers A and B.

Test Case 2: Ignored Versions in a File

When the file contains version strings A and B, where both A and B are ignored, does the returned list have "UNKNOWN" as its only element?

This test case is crucial to ensure that the checkers can correctly handle ignored versions in a file. The test should run the test checker against a file containing version strings A and B, where both A and B are ignored, and then check the returned list to ensure that it contains only "UNKNOWN".

Test Case 3: Partially Ignored Versions in a File

When the file contains version strings A, B, and C, where B is ignored, does the returned list contain version numbers A and C?

This test case is essential to ensure that the checkers can correctly handle partially ignored versions in a file. The test should run the test checker against a file containing version strings A, B, and C, where B is ignored, and then check the returned list to ensure that it contains version numbers A and C.

Implementation

To implement these new test cases, we need to modify the MyFakeChecker class in test/test_checkers.py. We can add new test methods to cover each of the new test cases. Here is an example of how we can implement these new test cases:

import unittest
from test_checkers import MyFakeChecker

class TestMyFakeChecker(unittest.TestCase):
    def test_multiple_versions(self):
        # Create a file containing version strings A and B
        file_content = "A\nB"
        # Run the test checker against the file
        result = MyFakeChecker().run(file_content)
        # Check the returned list to ensure it contains version numbers A and B
        self.assertEqual(result[0], "A")
        self.assertEqual(result[1], "B")

    def test_ignored_versions(self):
        # Create a file containing version strings A and B, where both A and B are ignored
        file_content = "A\nB"
        # Run the test checker against the file
        result = MyFakeChecker().run(file_content)
        # Check the returned list to ensure it contains only "UNKNOWN"
        self.assertEqual(result[0], "UNKNOWN")

    def test_partially_ignored_versions(self):
        # Create a file containing version strings A, B, and C, where B is ignored
        file_content = "A\nB\nC"
        # Run the test checker against the file
        result = MyFakeChecker().run(file_content)
        # Check the returned list to ensure it contains version numbers A and C
        self.assertEqual(result[0], "A")
        self.assertEqual(result[1], "C")

Conclusion

Q: What is the purpose of `test_checkers.py`?

A: The test_checkers.py file is used to test the correctness of the checkers used in a project. It contains test cases that ensure the checkers are working as expected.

Q: What are the current test cases in `test_checkers.py`?

A: The current test cases in test_checkers.py include:

Ignore Patterns: This test case checks whether the ignore patterns are working correctly.
Version Number Parsing: This test case checks whether the version number parsing is working correctly.

Q: What are the new test cases that need to be added to `test_checkers.py`?

A: The new test cases that need to be added to test_checkers.py include:

Multiple Versions in a File: This test case checks whether the returned list contains version numbers A and B when the file contains version strings A and B.
Ignored Versions in a File: This test case checks whether the returned list has "UNKNOWN" as its only element when the file contains version strings A and B, where both A and B are ignored.
Partially Ignored Versions in a File: This test case checks whether the returned list contains version numbers A and C when the file contains version strings A, B, and C, where B is ignored.

Q: Why are these new test cases necessary?

A: These new test cases are necessary because the recent changes introduced in #4911 allow the checkers to find multiple versions of a single product during a run. Without these test cases, it is not possible to ensure that the checkers are working correctly in this scenario.

Q: How can I implement these new test cases in `test_checkers.py`?

A: To implement these new test cases in test_checkers.py, you can add new test methods to the MyFakeChecker class. Here is an example of how you can implement these new test cases:

import unittest
from test_checkers import MyFakeChecker

class TestMyFakeChecker(unittest.TestCase):
    def test_multiple_versions(self):
        # Create a file containing version strings A and B
        file_content = "A\nB"
        # Run the test checker against the file
        result = MyFakeChecker().run(file_content)
        # Check the returned list to ensure it contains version numbers A and B
        self.assertEqual(result[0], "A")
        self.assertEqual(result[1], "B")

    def test_ignored_versions(self):
        # Create a file containing version strings A and B, where both A and B are ignored
        file_content = "A\nB"
        # Run the test checker against the file
        result = MyFakeChecker().run(file_content)
        # Check the returned list to ensure it contains only "UNKNOWN"
        self.assertEqual(result[0], "UNKNOWN")

    def test_partially_ignored_versions(self):
        # Create a file containing version strings A, B, and C, where B is ignored
        file_content = "A\nB\nC"
        # Run the test checker against the file
        result = MyFakeChecker().run(file_content)
        # Check the returned list to ensure it contains version numbers A and C
        self.assertEqual(result[0], "A")
        self.assertEqual(result[1], "C")

Q: What are the benefits of enhancing `test_checkers.py`?

A: The benefits of enhancing test_checkers.py include:

Improved Test Coverage: The new test cases ensure that the checkers are working correctly in scenarios where multiple versions of a single product are found during a run.
Increased Confidence: The new test cases provide increased confidence that the checkers are working correctly and that the project is stable.
Better Maintenance: The new test cases make it easier to maintain the project by ensuring that changes to the checkers do not break existing functionality.