Reverting to a Previous Commit

Oct 13, 2025 by talynt.org 55 views

Introduction

Pytest is a popular testing framework for Python that helps developers write and run tests for their code. However, sometimes pytest may fail to detect errors, leading to unexpected test results. In this article, we will explore a specific issue where pytest is unable to detect errors after a recent change to dpservice-cli.

The Problem

After the latest change to dpservice-cli, pytest is unable to detect errors anymore. This means that even if a test is supposed to fail, pytest will report it as a pass. To illustrate this issue, let's consider a test file called test_broken.py that contains a test function test_grpc_errors. This function is supposed to fail because it tries to add a VIP to a non-existent interface.

from helpers import *

def test_grpc_errors(prepare_ifaces, grpc_client):
        grpc_client.addvip(VM4.name, vip_vip)

When we run this test file using pytest test_broken.py, we expect it to fail because of the error in the test function. However, pytest reports it as a pass, indicating that it was unable to detect the error.

Debugging the Issue

To debug this issue, we need to understand what's happening behind the scenes. When we run pytest, it uses the dpservice-cli handler to execute the tests. The dpservice-cli handler is responsible for reacting to the return code of the test execution. In this case, the return code is 2, which indicates an error.

However, the dpservice-cli handler is expecting a JSON error response, which is not present in this case. This is likely the reason why pytest is unable to detect the error.

Reverting to a Previous Commit

To verify our hypothesis, let's revert to a previous commit (d80bc5a4fc7ff22b7b93720f1effd626e25b0e9b) and see if pytest fails as it should. When we run the test file again, we expect pytest to report the error and fail the test.

Conclusion

In conclusion, the issue with pytest unable to detect errors is likely tied to the fact that the dpservice-cli handler is reacting to the return code 2 in a way that is expecting a JSON error response, which is not present. By reverting to a previous commit, we can verify that pytest fails as it should, indicating that the issue is indeed related to the dpservice-cli handler.

Troubleshooting Steps

If you're experiencing a similar issue with pytest unable to detect errors, here are some troubleshooting steps you can follow:

Check the return code: Verify that the return code of the test execution is indeed 2, indicating an error.
Check the error response: Check if the error response is a JSON object, as expected by the dpservice-cli handler.
Revert to a previous commit: Revert to a previous commit and see if pytest fails as it should.
Check the dpservice-cli handler: Investigate the dpservice-cli handler to see if it's configured correctly and reacting to the return code as expected.

By following these troubleshooting steps, you should be able to identify and resolve the issue with pytest unable to detect errors.

Additional Resources

For more information on pytest and its configuration, please refer to the official pytest documentation:

Additionally, you can also refer to the dpservice-cli documentation for more information on its configuration and usage:

Dpservice-cli Documentation

Q: What is the issue with pytest unable to detect errors?

A: The issue with pytest unable to detect errors is likely tied to the fact that the dpservice-cli handler is reacting to the return code 2 in a way that is expecting a JSON error response, which is not present.

Q: What is the return code `2` and what does it indicate?

A: The return code 2 indicates an error. When pytest runs a test, it returns a code to indicate the result of the test. A return code of 2 means that the test failed.

Q: Why is the `dpservice-cli` handler expecting a JSON error response?

A: The dpservice-cli handler is expecting a JSON error response because it is configured to do so. However, in this case, the error response is not a JSON object, which is causing the issue.

Q: How can I verify that the issue is related to the `dpservice-cli` handler?

A: To verify that the issue is related to the dpservice-cli handler, you can revert to a previous commit and see if pytest fails as it should. If pytest fails as it should, it indicates that the issue is indeed related to the dpservice-cli handler.

Q: What are some troubleshooting steps I can follow to resolve the issue?

A: Here are some troubleshooting steps you can follow to resolve the issue:

Check the return code: Verify that the return code of the test execution is indeed 2, indicating an error.
Check the error response: Check if the error response is a JSON object, as expected by the dpservice-cli handler.
Revert to a previous commit: Revert to a previous commit and see if pytest fails as it should.
Check the dpservice-cli handler: Investigate the dpservice-cli handler to see if it's configured correctly and reacting to the return code as expected.

Q: Where can I find more information on pytest and its configuration?

A: You can find more information on pytest and its configuration in the official pytest documentation:

Additionally, you can also refer to the dpservice-cli documentation for more information on its configuration and usage:

Dpservice-cli Documentation

Q: How can I resolve the issue and get pytest to detect errors again?

A: To resolve the issue and get pytest to detect errors again, you need to investigate the dpservice-cli handler and ensure that it's configured correctly and reacting to the return code as expected. You may need to modify the configuration of the dpservice-cli handler or update the code to handle the error response correctly.

Conclusion

In conclusion, the issue with pytest unable to detect errors is likely tied to the fact that the dpservice-cli handler is reacting to the return code 2 in a way that is expecting a JSON error response, which is not present. By following the troubleshooting steps outlined in this article, you should be able to identify and resolve the issue and get pytest to detect errors again.