feat(Improvements): Migrate gcsx integration and random_reader tests to testify

[charith87]

Description

Migrate tests in internal/gcsx from legacy ogletest to testify:

• integration_test.go: Convert helper and integration tests to use testify/assert and testify/require.
• random_reader_test.go: Migrate random reader unit tests and mock expectations to testify/assert, testify/mock, and testify/require, and use t.TempDir() for isolated cache directory testing.
  Helps in standard IDE integration, moving away from unmaintained library, and unifying testing styles.

Link to the issue in case of a bug fix.

N/A

Testing details

1. Manual - make build passed.
2. Unit tests - go test -v -count=1 ./internal/gcsx/... passed.
3. Integration tests - N/A

Any backward incompatible change? If so, please explain.

N/A

[gemini-code-assist]

Code Review

This pull request refactors the integration and random reader tests in internal/gcsx to migrate from the deprecated ogletest framework to standard Go testing using testify/assert and testify/require. This includes introducing helper structs (integrationTestHelper and randomReaderTestHelper) to streamline test setup, teardown, and mocking. The review feedback highlights opportunities to improve test robustness and readability by replacing manual polling loops with require.Eventually and replacing assert.True(reflect.DeepEqual(...)) or assert.True(bytes.Equal(...)) with idiomatic assert.Equal assertions to get better failure diffs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.84%. Comparing base (872920d) to head (6a9faea).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5031      +/-   ##
==========================================
- Coverage   83.90%   83.84%   -0.07%     
==========================================
  Files         176      176              
  Lines       21546    21546              
==========================================
- Hits        18078    18065      -13     
- Misses       2769     2782      +13     
  Partials      699      699              

Flag	Coverage Δ
unittests	83.84% <ø> (-0.07%)	⬇️

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