This variable is used when running unit tests to indicate that the CLI's business logic
is run as a subject of a unit test. We can use this variable to disable output through
the standard streams.
Parameters
env: ProcessEnv = process.env
The environment variables from the environment of the current process.
Returns boolean
True if the SHOPIFY_UNIT_TEST environment variable is truthy.
This variable is used when running unit tests to indicate that the CLI's business logic is run as a subject of a unit test. We can use this variable to disable output through the standard streams.