Add instructions on how to run tests.

Change-Id: I52bbf3f36fb1942ae10e617f75bcd4a68ee2fc3c
diff --git a/ravenwood/test-authors.md b/ravenwood/test-authors.md
index 2ab43bb..0a0b200 100644
--- a/ravenwood/test-authors.md
+++ b/ravenwood/test-authors.md
@@ -6,6 +6,20 @@
 
 When writing tests under Ravenwood, all Android API symbols associated with your declared `sdk_version` are available to link against using, but unsupported APIs will throw an exception.  This design choice enables mocking of unsupported APIs, and supports sharing of test code to build “bivalent” test suites that run against either Ravenwood or a traditional device.
 
+## Manually running tests
+
+To run all Ravenwood tests, use:
+
+```
+./frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
+```
+
+To run a specific test, use "atest" as normal, selecting the test from a Ravenwood suite such as:
+
+```
+atest CtsOsTestCasesRavenwood:ParcelTest\#testSetDataCapacityNegative
+```
+
 ## Typical test structure
 
 Below are the typical steps needed to add a straightforward “small” unit test: