How to make `it.only` environment-aware using mocha?

@elisha_langworth 

To make it.only environment-aware using Mocha, you can conditionally enable it based on a specific environment variable. Here's an example of how you can achieve this:

1. Create a custom it.onlyIf function that checks for the presence of a specific environment variable before enabling it.only.

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const itOnlyIf = (condition) => {
  return condition ? it.only : it;
}

1. Use the itOnlyIf function to define your test cases, passing in the condition based on the value of the environment variable.

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describe('My Test Suite', function() {
  itOnlyIf(process.env.NODE_ENV === 'development')('should do something only in development environment', function() {
    // Test logic goes here
  });

  itOnlyIf(process.env.NODE_ENV === 'production')('should do something only in production environment', function() {
    // Test logic goes here
  });
});

1. Set the NODE_ENV environment variable when running your Mocha tests to control which it.only test cases will be enabled.

For example, you can run your tests in development mode by setting the NODE_ENV environment variable to development:

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NODE_ENV=development mocha

Or run your tests in production mode by setting the NODE_ENV environment variable to production:

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NODE_ENV=production mocha

This way, you can make it.only environment-aware by selectively enabling or disabling specific test cases based on the environment in which the tests are running.