The usage kata is intended as an experiment in applying Test Driven Development at the program boundary.
Create a command line application with the following behavior:
The command supports a single option: --help
When the command is invoked with the help option, a usage message is written to STDOUT, and the program exits successfully.
When the command is invoked without the help option, a diagnostic is written to STDERR, and the program exits unsuccessfully.
Example:
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