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+Test Transforms
+===============
+
+Test descriptions specify how to run a unittest or talos run. They aim to
+describe this abstractly, although in many cases the unique nature of
+invocation on different platforms leaves a lot of specific behavior in the test
+description, divided by ``by-test-platform``.
+
+Test descriptions are validated to conform to the schema in
+``taskcluster/gecko_taskgraph/transforms/test/__init__.py``. This schema is
+extensively documented and is a the primary reference for anyone modifying
+tests.
+
+The output of ``tests.py`` is a task description. Test dependencies are
+produced in the form of a dictionary mapping dependency name to task label.