@olton/latte/src/expects/matchers/throw.js

Simple test framework for JavaScript and TypeScript with DOM supports

export default {
  /**
     * Asserts that the actual function throws an error.
     * @param msg - The message to display if the assertion fails.
     * @returns {Expect}.
     */
  toThrow (msg = null) {
    const received = this.received
    let result = false
    try {
      received.apply()
    } catch (e) {
      result = true
    }

    this.assert(
      result,
      msg,
      'toThrow'
    )

    return this
  },

  /**
     * Asserts that the actual function throws an error matching the expected value.
     * @param expected - The expected error.
     * @param msg - The message to display if the assertion fails.
     * @returns {Expect}.
     */
  toThrowError (expected, msg = null) {
    const received = this.received
    let result = false
    let message = ''
    try {
      received.apply()
    } catch (e) {
      message = e.message
      result = e.message.match(expected) !== null
    }

    this.assert(
      result,
      msg,
      'toThrowError',
      expected,
      message
    )

    return this
  }
}