TypeScript jest-matcher-utils.matcherErrorMessage函數代碼示例

const ensureMock = (mockOrSpy: any, matcherName: any) => {
  if (
    !mockOrSpy ||
    ((mockOrSpy.calls === undefined || mockOrSpy.calls.all === undefined) &&
      mockOrSpy._isMockFunction !== true)
  ) {
    throw new Error(
      matcherErrorMessage(
        matcherHint('[.not]' + matcherName, 'jest.fn()', ''),
        `${RECEIVED_COLOR('received')} value must be a mock or spy function`,
        printWithType('Received', mockOrSpy, printReceived),
      ),
    );
  }
};

  function(this: MatcherState, received: Function, expected: any) {
    const options = {
      isNot: this.isNot,
      promise: this.promise,
    };

    let thrown = null;

    if (fromPromise && isError(received)) {
      thrown = getThrown(received);
    } else {
      if (typeof received !== 'function') {
        if (!fromPromise) {
          const placeholder = expected === undefined ? '' : 'expected';
          throw new Error(
            matcherErrorMessage(
              matcherHint(matcherName, undefined, placeholder, options),
              `${RECEIVED_COLOR('received')} value must be a function`,
              printWithType('Received', received, printReceived),
            ),
          );
        }
      } else {
        try {
          received();
        } catch (e) {
          thrown = getThrown(e);
        }
      }
    }

    if (expected === undefined) {
      return toThrow(matcherName, options, thrown);
    } else if (typeof expected === 'function') {
      return toThrowExpectedClass(matcherName, options, thrown, expected);
    } else if (typeof expected === 'string') {
      return toThrowExpectedString(matcherName, options, thrown, expected);
    } else if (expected !== null && typeof expected.test === 'function') {
      return toThrowExpectedRegExp(matcherName, options, thrown, expected);
    } else if (
      expected !== null &&
      typeof expected.asymmetricMatch === 'function'
    ) {
      return toThrowExpectedAsymmetric(matcherName, options, thrown, expected);
    } else if (expected !== null && typeof expected === 'object') {
      return toThrowExpectedObject(matcherName, options, thrown, expected);
    } else {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${EXPECTED_COLOR(
            'expected',
          )} value must be a string or regular expression or class or error`,
          printWithType('Expected', expected, printExpected),
        ),
      );
    }
  };

): PromiseMatcherFn => (...args) => {
  const options = {
    isNot,
    promise: 'rejects',
  };

  if (!isPromise(actual)) {
    throw new JestAssertionError(
      matcherUtils.matcherErrorMessage(
        matcherUtils.matcherHint(matcherName, undefined, '', options),
        `${matcherUtils.RECEIVED_COLOR('received')} value must be a promise`,
        matcherUtils.printWithType(
          'Received',
          actual,
          matcherUtils.printReceived,
        ),
      ),
    );
  }

  const innerErr = new JestAssertionError();

  return actual.then(
    result => {
      outerErr.message =
        matcherUtils.matcherHint(matcherName, undefined, '', options) +
        '\n\n' +
        `Received promise resolved instead of rejected\n` +
        `Resolved to value: ${matcherUtils.printReceived(result)}`;
      return Promise.reject(outerErr);
    },
    reason =>
      makeThrowingMatcher(matcher, isNot, 'rejects', reason, innerErr).apply(
        null,
        args,
      ),
  );
};

    return {message, pass};
  },

  toBeInstanceOf(this: MatcherState, received: any, expected: Function) {
    const matcherName = 'toBeInstanceOf';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };

    if (typeof expected !== 'function') {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${EXPECTED_COLOR('expected')} value must be a function`,
          printWithType('Expected', expected, printExpected),
        ),
      );
    }

    const pass = received instanceof expected;

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          printExpectedConstructorNameNot('Expected constructor', expected) +
          (typeof received.constructor === 'function' &&
          received.constructor !== expected
            ? printReceivedConstructorNameNot(

      '\n\n' +
      `Expected:${isNot ? ' not' : ''} >= ${printExpected(expected)}\n` +
      `Received:${isNot ? '    ' : ''}    ${printReceived(received)}`;

    return {message, pass};
  },

  toBeInstanceOf(this: MatcherState, received: any, constructor: Function) {
    const constType = getType(constructor);

    if (constType !== 'function') {
      throw new Error(
        matcherErrorMessage(
          matcherHint('.toBeInstanceOf', undefined, undefined, {
            isNot: this.isNot,
          }),
          `${EXPECTED_COLOR('expected')} value must be a function`,
          printWithType('Expected', constructor, printExpected),
        ),
      );
    }
    const pass = received instanceof constructor;

    const message = pass
      ? () =>
          matcherHint('.toBeInstanceOf', 'value', 'constructor', {
            isNot: this.isNot,
          }) +
          '\n\n' +
          `Expected constructor: ${EXPECTED_COLOR(
            constructor.name || String(constructor),