Write tests for cache performance in fine-grained incremental mode

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python
领域
build-system, testing-qa

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Start with build.py and trace cache loading for a daemon cold start using --cache-fine-grained. Add an end-to-end test that runs normally to write cache files, then starts the daemon cold and verifies those files are successfully loaded; the test should pass reliably and guard the real-world cache-loading path.

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描述

priority-1-normal topic-fine-grained-incremental topic-tests

We don't have good tests for end-to-end cache performance. It would be good to add tests that check that cache files written in a normal run with --cache-fine-grained are then successfully loaded in a subsequent daemon cold start. The emphasis here is on end-to-end, we have tests that use cache but they don't exactly emulate what happens "in real world". An additional argument for this is that code in build.py responsible for cache loading is quite complicated, so it is better to be sure that we don't break it.

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