I usually run my unit tests in Eclipse on my development system, or from the command-line on the target environment in bulk.
Sometimes though it's useful to run a single unit test from the command line. There are two equivalent ways of doing that:
rake test=test\integration\firmware_upgrade_test.rb
ruby test\integration\firmware_upgrade_test.rb
Here's an example of the use of 
Here's a nice example of a cross-over food: Dutch style hagelslag, produced in Indonesia and imported into the United States. 