Behavior of Hermes Builds When Mocking Native Modules in React Native Integration Tests

Goal: Ensure that integration tests using mocked environment variables produce identical outcomes regardless of whether the Hermes engine is enabled in debug or release build configurations.

Constraint: Community discussion notes that Hermes may treat mocked native modules differently during JSI module initialization, leading to inconsistent test behavior between builds, yet no definitive guidance exists on aligning test environments or configuring mocks to guarantee parity.

Does Hermes initialize mocked native modules identically in debug and release modes? What test‑setup adjustments eliminate JSI‑related discrepancies? Are there recommended mocking patterns that work uniformly across both Hermes configurations?