Serialize environment variable modifications in Rust tests via global mutex. - #2185
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… mutex. In Google FuzzTest Rust tests, tests modifying environment variables previously required running in single-threaded mode via `--test-threads=1` to avoid data races across threads. Introduce an `EnvVars` builder utility that acquires a global mutex lock, applies key-value environment modifications, tracks pre-existing values, and restores original environment states when dropped. Remove `--test-threads=1` from Bazel test configurations, enabling full parallel test execution. PiperOrigin-RevId: 964734117
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Serialize environment variable modifications in Rust tests via global mutex.
In Google FuzzTest Rust tests, tests modifying environment variables previously required running in single-threaded mode via
--test-threads=1to avoid data races across threads.Introduce an
EnvVarsbuilder utility that acquires a global mutex lock, applies key-value environment modifications, tracks pre-existing values, and restores original environment states when dropped. Remove--test-threads=1from Bazel test configurations, enabling full parallel test execution.