Add tblib to fix parallel test runner crashes on Selenium exceptions #5297
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Co-authored-by: DonnieBLT <[email protected]>
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Pull request overview
This PR addresses test execution issues by adding the tblib (traceback library) package as a dev dependency. The purpose is to fix crashes that occur when running Django tests with the --parallel flag, specifically when Selenium tests fail with unpicklable exception tracebacks. Django's parallel test runner uses multiprocessing to distribute tests across worker processes, and tblib enables proper serialization of complex tracebacks (like those from Selenium exceptions) so they can be sent back to the main process for reporting.
Key Changes:
- Added
tblib = "^3.0.0"to the Poetry dev dependencies inpyproject.toml
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@copilot update poetry lock file |
Co-authored-by: DonnieBLT <[email protected]>
Django's parallel test runner crashes with
TypeError: cannot pickle 'traceback' objectwhen Selenium tests fail because Selenium exception tracebacks contain unpicklable objects like WebDriver instances.Changes
tblib = "^3.0.0"to dev dependencies inpyproject.tomlpoetry.lockto include tblib 3.2.2 with proper hash verificationTechnical Details
When using
--parallel, Django's test runner spawns worker processes via multiprocessing. Failed test exceptions must be pickled to communicate back to the main process. Without tblib, complex tracebacks (particularly from Selenium's TimeoutException) cannot be serialized, crashing the entire suite instead of reporting the failure.Django detects tblib automatically and uses it to serialize tracebacks. This is the official Django recommendation (see error message from PR #5295).
Impact
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