Add tests for error handling and retry scenarios in RegistryWireMockTest

[vaidikcode]

Signed-off-by: vaidikcode vaidikbhardwaj00@gmail.com

Description

Issue #23

This PR improves test coverage for the Registry client by adding three new test methods:

shouldHandle500Error: Tests the client's ability to properly handle HTTP 500 errors from the registry and convert them into OrasExceptions with the correct status code.

shouldHandleTimeout: Tests the client's handling of HTTP 408 (Request Timeout) responses, ensuring that timeout conditions are properly propagated as OrasExceptions.

shouldRetryBlobUpload: Implements scenario-based testing using WireMock to verify that the client can successfully retry blob uploads after an initial server error. This test demonstrates the retry capability of the Registry client when pushing content.

Testing done

Tests run successfully in isolation and in sequence
Some existing test failures in other classes are unrelated to these changes

Submitter checklist

• I have read and understood the CONTRIBUTING guide
• I have run mvn license:update-file-header, mvn spotless:apply, pre-commit run -a, mvn clean install before opening the PR

[vaidikcode]

I attempted to run tests in parallel, but they remain flaky. I also used dynamic ports and even tried reinitializing WireMock instances. No luck finding why they remain flaky.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.16%. Comparing base (ccaf165) to head (9211ba6).
Report is 8 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #165      +/-   ##
============================================
+ Coverage     82.82%   83.16%   +0.34%     
- Complexity      299      308       +9     
============================================
  Files            26       27       +1     
  Lines          1077     1093      +16     
  Branches        104      105       +1     
============================================
+ Hits            892      909      +17     
+ Misses          130      129       -1     
  Partials         55       55              

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[jonesbusy]

Can you ensure all commits are signed? Ideally the PR need to be rebased and only one commmits must be present (for such small change). When done I will merge

Thanks

[jonesbusy]

Commit is not signed

[vaidikcode]

Commit is not signed

Done