The mocha plugin has the following issues:

• Relies on presence of an explicit require or import of mocha in source code, but Mocha does not.
• Does not recognize dependencies (e.g. ts-node/register or dotenv/config) in the requires configuration field.

The mocha test has the following issues:

• isEnabled returns false since the fixture package.json dependencies do not include mocha; so it does not actually test the plugin
• fixture config has extension , which plugin does not support, and does not have spec which the plugin does support

This PR addresses:

• isEnabled will return true if default Mocha config file is present.
• resolveConfig adds mocha dependency
• resolveConfig supports both entries and dependencies from the require field
• test fixture is updated to:
  • use spec instead of extension
  • include the mocha, @types/mocha, and ts-node dependencies in package.json
  • include both file and dependency values for require