code: function oneFunctionArgWithLength(length, func) {
      expect(func).to.be.a('function')
      const fname = func.name
      expect(func).to.have.length.of.at.least(length, `Wrapped function ${fname} must accept at least ${length} arguments`)
      return fname
  }
docs: const eyes = require('eyes'), p = eyes.inspect.bind(eyes)