Add caching_sha2_password auth response unit and integration coverage

[Copilot]

The test suite covered mysql_native_password but did not exercise caching_sha2_password. This adds unit-level coverage for the SHA256-based response path used by the caching SHA2 auth plugin and an integration test that authenticates with a dedicated caching_sha2_password user.

• Test coverage
  • Add a unit test that validates the caching SHA2 auth response computation, including salt trimming behavior.
  • Add an integration test that creates a caching_sha2_password user, authenticates with it, and cleans up afterward.
• Visibility for testing
  • Expose the caching SHA2 response helper to the test assembly via internal access.

var response = connection.GenerateCachingSha2Response(salt);
Assert.Equal(expected, response);

[!WARNING]

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[kerryjiang]

Can you add integration tests for caching_sha2_password? Like create another user other than root authenticating with caching_sha2_password

[Copilot]

Can you add integration tests for caching_sha2_password? Like create another user other than root authenticating with caching_sha2_password

Added an integration test that creates a caching_sha2_password user, authenticates with it, and cleans up afterward (commit 59edf96).

Warning

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