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+This directory contains a number of tests to ensure test running
+infrastructure is operating correctly:
+
+ * The tests in assumptions/ are designed to test UA assumptions
+ documented in [assumptions.md](/docs/_writing-tests/assumptions.md).
+
+ * The tests in server/ are designed to test the WPT server configuration
+
+ * The tests in expected-fail/ should all fail.
+
+To update the expectations stored in metadata/, you want to use the `wpt`
+tool with an invocation such as `./wpt update-expectations --metadata
+infrastructure/metadata --manifest MANIFEST.json [wptreport.json]` with one
+or more wptreport.json files.