algebra/test/features/methodUnaryOperator.js

means completeness and balancing, from the Arabic word الجبر

/**
 * Check if unary operator is a mutator
 *
 * @api private
 *
 * @param {Object} Scalar
 * @param {String} operator name
 * @param {*} operand
 * @param {*} resultData
 *
 * @returns {Function} mutatorUnaryOperatorTest
 */

function mutatorUnaryOperator (Scalar, operator, operand, resultData) {
  return function mutatorUnaryOperatorTest () {
    const scalar = new Scalar(operand)

    const result = scalar[operator]()

    result.data.should.eql(resultData)
  }
}

module.exports = mutatorUnaryOperator