patch randomness while running tests

[misrasaurabh1]

User description

we can't find optimizations where the function to optimize calls any of the non-deterministic functions below.

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PR Type

Enhancement, Tests

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Description

• Apply deterministic randomness patches

• Override time, perf_counter, uuid random

• Patch os.urandom and seed numpy

• Add comprehensive deterministic patch tests

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Changes walkthrough 📝

	Relevant files
Enhancement	pytest_plugin.py Implement deterministic randomness patches                              codeflash/verification/pytest_plugin.py Added _apply_deterministic_patches function Overrides time, perf_counter, uuid, random Patches os.urandom and seeds numpy.random Stores datetime mocks in builtins +112/-0
Tests	test_pytest_plugin_deterministic_patches.py Add deterministic patch tests                                                        tests/test_pytest_plugin_deterministic_patches.py New tests for deterministic patch functionality Verifies time, uuid, random, os.urandom Tests numpy seeding and datetime mocks Covers performance and integration scenarios +328/-0

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[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Incomplete datetime patching The code stores mock datetime functions in builtins but never overrides datetime.datetime.now or utcnow, so any code calling those methods directly remains non-deterministic. # For datetime, we need to use a different approach since we can't patch class methods # Store original methods for potential later use import builtins builtins._original_datetime_now = _original_datetime_now # noqa: SLF001 builtins._original_datetime_utcnow = _original_datetime_utcnow # noqa: SLF001 builtins._mock_datetime_now = mock_datetime_now # noqa: SLF001 builtins._mock_datetime_utcnow = mock_datetime_utcnow # noqa: SLF001 Performance overhead in mocks Each mock function invokes the original implementation to “maintain performance characteristics,” adding unnecessary overhead and risking flakiness in performance tests. def mock_time_time() -> float: """Return fixed timestamp while preserving performance characteristics.""" _original_time() # Maintain performance characteristics return fixed_timestamp def mock_perf_counter() -> float: """Return incrementing counter for relative timing.""" nonlocal _perf_counter_calls _original_perf_counter() # Maintain performance characteristics _perf_counter_calls += 1 return _perf_counter_start + (_perf_counter_calls * 0.001) # Increment by 1ms each call Global patch scope Patches are applied unconditionally at module import and never reverted, which can leak side effects into unrelated tests. Consider scoping patches within fixtures or providing a teardown mechanism. _apply_deterministic_patches()

[github-actions]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	Respect timezone conversion Convert the fixed datetime to the requested timezone using astimezone rather than replace, ensuring correct timezone-aware behavior. codeflash/verification/pytest_plugin.py [115-120] def mock_datetime_now(tz: datetime.timezone | None = None) -> datetime.datetime: """Return fixed datetime while preserving performance characteristics.""" - _original_datetime_now(tz) # Maintain performance characteristics + _original_datetime_now(tz) if tz is None: return fixed_datetime - return fixed_datetime.replace(tzinfo=tz) + return fixed_datetime.astimezone(tz) Suggestion importance[1-10]: 7 __ Why: It ensures correct timezone-aware behavior by converting the fixed datetime with astimezone instead of simply replacing the tzinfo.	Medium

[codeflash-ai]

⚡️ Codeflash found optimizations for this PR

📄 8,957% (89.57x) speedup for _apply_deterministic_patches in codeflash/verification/pytest_plugin.py

⏱️ Runtime : 1.63 milliseconds → 18.0 microseconds (best of 30 runs)

I created a new dependent PR with the suggested changes. Please review:

• ⚡️ Speed up function _apply_deterministic_patches by 8,957% in PR #378 (patch-randomness) #379

If you approve, it will be merged into this PR (branch patch-randomness).

[KRRT7]

LGTM