Merge pull request #921 from AStove/EditDocs2

Running Tests docs: quotes for setting env vars in windows

(cherry picked from commit 6f65923)

Author: lukebakken

RUNNING_TESTS.md

@@ -46,6 +46,12 @@ It is possible to install and run a node using any [binary build](https://www.ra
 for the platform. Its [CLI tools]() then must be added to `PATH` so that `rabbitmqctl` (`rabbitmqctl.bat` on Windows)
 can be invoked directly without using an absolute file path.
 
+On Windows, you must run unit tests as follows (replace `X.Y.Z` with your RabbitMQ version):
+
+```
+set "RABBITMQ_RABBITMQCTL_PATH=C:\Program Files\RabbitMQ Server\rabbitmq_server-X.Y.Z\sbin\rabbitmqctl.bat"
+.\run-test.bat
+```
 
 ### Option Two: Using RabbitMQ Umbrella Repository