Create RUNNING_TESTS.md

Author: michaelklishin

RUNNING_TESTS.md

@@ -30,17 +30,25 @@ This will complete the code AMQP 0-9-1 protocol code generation and build all pr
 Tests can be run from Visual Studio using [NUnit Test Adapter](https://visualstudiogallery.msdn.microsoft.com/6ab922d0-21c0-4f06-ab5f-4ecd1fe7175d).
 Note that it may take some time for the adapter to discover tests in the assemblies.
 
-Running the tests from the command line is also straightforward you don't need to build first to do this: use
+The test suite assumes there's a RabbitMQ node [built from source](http://www.rabbitmq.com/build-server.html) running locally
+with all defaults. Team RabbitMQ uses [rabbitmq-public-umbrella](https://github.com/rabbitmq/rabbitmq-public-umbrella) to
+do that:
 
-On Windows run:
+    git clone https://github.com/rabbitmq/rabbitmq-public-umbrella umbrella
+    cd umbrella
+    make co
+    cd deps/rabbit
+    make
+    make run-broker
+
+Then, to run the tests on Windows use:
 
     run-test.bat
 
-On osx/linux run:
+On MacOS, Linux, BSD use:
 
     run-test.sh
 
-
 Running individual tests and fixtures on Windows is trivial using the Visual Studio test runner.
 To run a specific tests fixture on osx/linux you can use nunit3 where expressions to select the tests
 to be run: