Added missing provider unit tests

[m-olko]

This PR

Adds missing provider structure unit tests. It mostly tests the behavior of init and shutdown with respect to calling resolve during different moments.

How to test

bazelisk test //providers/flagd/tests:provider_test

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the testability and robustness of the FlagdProvider. By refactoring the provider's constructors to support dependency injection, it enables isolated testing of its core functionalities. The addition of new unit tests validates the provider's lifecycle and ensures correct interaction with its dependencies, leading to a more reliable component.

Highlights

• Enhanced Testability: Introduced new constructors for FlagdProvider that allow for dependency injection of FlagSync and Evaluator components, significantly improving the testability of the provider.
• New Unit Tests for FlagdProvider: Added a comprehensive suite of unit tests for the FlagdProvider class, covering its initialization, readiness state, evaluation delegation, and shutdown behavior using Google Test and Google Mock.
• Code Cleanup: Removed an unnecessary include of <cstdlib> from provider.cpp, contributing to cleaner code.

Changelog

• providers/flagd/src/provider.cpp
  • Removed unused include for cstdlib.
  • Added two new constructors to FlagdProvider for injecting FlagSync and Evaluator dependencies.
• providers/flagd/src/provider.h
  • Declared two new constructors for FlagdProvider to support dependency injection.
• providers/flagd/tests/BUILD
  • Added a new cc_test target named provider_test to build the new unit tests for FlagdProvider.
• providers/flagd/tests/provider_test.cpp
  • Added a new file containing unit tests for FlagdProvider.
  • Implemented mock classes for FlagSync and Evaluator using gmock.
  • Included tests for metadata, provider readiness before and after initialization, delegation of evaluation calls, and shutdown behavior.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request adds unit tests for the FlagdProvider, which is a great addition. To enable testing, new constructors are introduced to allow dependency injection of FlagSync and Evaluator. The tests are well-structured and cover the basic states of the provider (ready, not ready, shutdown). My feedback includes suggestions to make a couple of test assertions more robust and complete.