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Thanks for the feedback! We downrank test files with a heuristic, though we'll definitely be looking to make this more sophisticated. You can also exclude results using a regular expression, like `foo NOT path:/_test\.go$/`.

And also note that if you often need to add this kind of qualifier to many searches, you can create a "custom scope" that includes it for you transparently.

And inversely, searching specifically for test code can also be useful. For example if searching for an implementation example.

Exactly this. It will also reduce unnecessary requests on their servers.