Add unit test for null and empty boundary checks in APIUtil

[SahanAdithya]

Purpose

This PR introduces a missing unit test case to APIUtilTest.java to validate boundary edge cases for the isSupportedFileType method.

Approach

Added testIsSupportedFileTypeWithNullAndEmpty() to verify that passing null or an empty string "" as arguments safely evaluates to false instead of triggering unexpected unhandled behavior, matching the surrounding test infrastructure styles.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 6f3efb66-30e7-430c-9ca5-7a010462c95f

📥 Commits

Reviewing files that changed from the base of the PR and between 72b16bb and b1d338c.

📒 Files selected for processing (1)

• components/apimgt/org.wso2.carbon.apimgt.impl/src/test/java/org/wso2/carbon/apimgt/impl/utils/APIUtilTest.java

---

📝 Walkthrough

Walkthrough

A single JUnit test method is added to APIUtilTest.java to validate that APIUtil.isSupportedFileType() returns false when given null or empty string filenames. The test mocks the required ServiceReferenceHolder and configuration services to isolate the validation logic.

Changes

File Type Validation Test

Layer / File(s)	Summary
Null and empty filename validation test components/apimgt/org.wso2.carbon.apimgt.impl/src/test/java/org/wso2/carbon/apimgt/impl/utils/APIUtilTest.java	New test method with mocked service dependencies asserts that isSupportedFileType(null) and isSupportedFileType("") both return false, covering null/empty edge cases.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: adding a unit test for boundary checks (null and empty values) in APIUtil.
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose and approach of adding the new test for null and empty boundary cases in isSupportedFileType.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}