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+This directory contains interface tests for external libraries. The goal
+is not to test every possible path through a library's code and get 100%
+coverage. It's to give us a level of confidence that their general interface
+remains the same through version upgrades.
+
+This gives us a place to put these tests without having to litter our
+own tests with assertions that are not directly related to the code
+under test. The expectations for the external library are all in one
+place so it makes it easier for us to find out what they are.