Add Integration test for chained Downscoping Interceptors

[shrutisinghania]

Add integration test for chained Downscoping Interceptors to ensure that gRPC requests correctly manage and do not duplicate Authorization headers.

[gemini-code-assist]

Summary of Changes

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This pull request introduces a new integration test to validate the behavior of gRPC client interceptors within the Google Cloud Storage client. The primary goal is to ensure that when multiple downscoping interceptors are chained, they correctly manage and do not duplicate Authorization headers in outgoing requests, both with and without explicit credentials. This helps maintain the integrity and efficiency of authentication mechanisms.

Highlights

• Integration Test for Chained Interceptors: Added a new integration test GoogleCloudStorageClientDownscopingIntegrationTest to verify that chained gRPC interceptors, specifically those involved in downscoping, correctly handle Authorization headers without duplication. This includes scenarios both with and without explicit credentials.

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Changelog

• gcsio/src/test/java/com/google/cloud/hadoop/gcsio/integration/GoogleCloudStorageClientDownscopingIntegrationTest.java
  • Added integration tests to ensure that chained gRPC interceptors do not duplicate Authorization headers.
  • Included tests for scenarios both with and without explicit credentials to cover different authentication flows.

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[gemini-code-assist]

Code Review

This pull request adds an integration test to verify the behavior of chained gRPC downscoping interceptors, ensuring that Authorization headers are not duplicated. A security audit found no vulnerabilities within the scope of these changes. However, there are critical issues with assertions that test for the wrong behavior, and a minor issue with using System.err for logging.

[shrutisinghania]

/gcbrun

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.00%. Comparing base (cb92293) to head (fc18c76).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1653      +/-   ##
============================================
+ Coverage     81.91%   82.00%   +0.08%     
  Complexity     2477     2477              
============================================
  Files           132      132              
  Lines         11084    11084              
  Branches       1348     1348              
============================================
+ Hits           9080     9089       +9     
+ Misses         1440     1432       -8     
+ Partials        564      563       -1     

Flag	Coverage Δ
integrationtest	67.71% <ø> (+0.46%)	⬆️
unittest	72.68% <ø> (ø)

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