Function toThrowExpectedString

packages/expect/src/toThrowMatchers.ts:341–376

(
  matcherName: string,
  options: MatcherHintOptions,
  thrown: Thrown | null,
  expected: string,
)

};

const toThrowExpectedString = (
  matcherName: string,
  options: MatcherHintOptions,
  thrown: Thrown | null,
  expected: string,
): SyncExpectationResult => {
  const pass = thrown !== null && thrown.message.includes(expected);

  const message = pass
    ? () =>
        // eslint-disable-next-line prefer-template
        matcherHint(matcherName, undefined, undefined, options) +
        '\n\n' +
        formatExpected('Expected substring: not ', expected) +
        (thrown !== null && thrown.hasMessage
          ? formatReceived(
              'Received message:       ',
              thrown,
              'message',
              expected,
            ) + formatStack(thrown)
          : formatReceived('Received value:         ', thrown, 'value'))
    : () =>
        // eslint-disable-next-line prefer-template
        matcherHint(matcherName, undefined, undefined, options) +
        '\n\n' +
        formatExpected('Expected substring: ', expected) +
        (thrown === null
          ? `\n${DID_NOT_THROW}`
          : thrown.hasMessage
            ? formatReceived('Received message:   ', thrown, 'message') +
              formatStack(thrown)
            : formatReceived('Received value:     ', thrown, 'value'));

  return {message, pass};
};

const toThrow = (
  matcherName: string,