chore: Fix flaky testCreateAndUpdateTableWithPolicyTags test

[lqiu96]

Fixes #4097

[gemini-code-assist]

Summary of Changes

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This pull request resolves a flakiness issue in an integration test by enhancing the uniqueness of resource identifiers. The change ensures that parallel executions of the test do not interfere with each other due to name collisions, leading to more reliable test results and a stable testing environment.

Highlights

• Flaky Test Fix: Addressed a known flakiness issue in the testCreateAndUpdateTableWithPolicyTags integration test by ensuring unique resource naming.
• Unique DisplayName Generation: Switched from using Instant.now().getNano() to UUID.randomUUID().toString().substring(0, 8) for generating the DisplayName of a BigQuery Taxonomy, preventing collisions during parallel test runs.

Changelog

• google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/it/ITBigQueryTest.java
  • Updated the testCreateAndUpdateTableWithPolicyTags method to use a UUID-based approach for generating unique taxonomy display names, mitigating test flakiness.

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[gemini-code-assist]

Code Review

This pull request fixes a flaky test by using a UUID for generating a unique taxonomy display name, which is a good improvement. My feedback includes a suggestion to use the full UUID instead of a truncated one to make the fix more robust and prevent future collisions. I've also suggested a minor simplification to the string formatting for better readability.

[gemini-code-assist]

While using a UUID is a great improvement for uniqueness over Instant.now().getNano(), truncating it to 8 characters reduces its entropy and still leaves a small chance of collision, which could lead to test flakiness in the future. To ensure uniqueness across the organization as the comment suggests, it would be more robust to use the full UUID. If there is a length limit for DisplayName, it would be helpful to document that with a comment.

Additionally, for simple string concatenation, using the + operator is often more readable and can be more efficient than String.format.

                      .setDisplayName("testing taxonomy " + UUID.randomUUID().toString())