function equals(agent, param, description) {
  const [leftFn, leftProp] = param.left.split('.')
  const [rightFn, rightProp] = param.right.split('.')
  const left = parameters[leftFn](agent)
  const right = parameters[rightFn](agent)
  assert.equal(left[leftProp], right[rightProp], description)
}
Asserts values of two different parameters are equal
@param {Agent} agent instance
@param {object} param object. Executes function from parameters.js
@param {string} description of test assertion