docs: add note about test case prefixing

Based on @dhurley feedback in #956 (comment)
nginx · Jan 9, 2025 · 988212a · 988212a
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -48,6 +48,8 @@ can be merged. Your agreement signature will be safely stored by F5 and no longe
 
 <!-- ### Go Guidelines Here Linter-->
 
+* when writing [table-driven tests](https://go.dev/wiki/TableDrivenTests), add a numbered prefix to each test case name (`Test 1:`, `Test 2:`, and so on) to make it easier to see which cases failed.
+
 ### Git Guidelines
 
 * Keep a clean, concise and meaningful git commit history on your branch (within reason), rebasing locally and squashing before submitting a PR.