Add tests for error handling and retry scenarios in RegistryWireMockTest

[vaidikcode]

Signed-off-by: vaidikcode [email protected]

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 83.07%. Comparing base (1a0abbc) to head (20e8a02).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #165      +/-   ##
============================================
+ Coverage     82.52%   83.07%   +0.54%     
- Complexity      294      297       +3     
============================================
  Files            25       25              
  Lines          1093     1093              
  Branches        114      114              
============================================
+ Hits            902      908       +6     
+ Misses          128      126       -2     
+ Partials         63       59       -4     

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