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diff --git a/t/README b/t/README
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+++ b/t/README
@@ -271,6 +271,15 @@ Do:
- Check the test coverage for your tests. See the "Test coverage"
below.
+ Don't blindly follow test coverage metrics, they're a good way to
+ spot if you've missed something. If a new function you added
+ doesn't have any coverage you're probably doing something wrong,
+ but having 100% coverage doesn't necessarily mean that you tested
+ everything.
+
+ Tests that are likely to smoke out future regressions are better
+ than tests that just inflate the coverage metrics.
+
Don't:
- exit() within a <script> part.