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The name of the command (a.k.a. Test Suite) currently running. Used for result
merging and caching. It first tries to make a guess based upon the command line
arguments the current test suite is running on and should automatically detect
unit tests, functional tests, integration tests, rpsec and cucumber and label
them properly. If it fails to recognize the current command, the command name
is set to the shell command that the current suite is running on.
You can specify it manually with SimpleCov.command_name("test:units") - please
also check out the corresponding section in README.rdoc