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

 : () => {
     const diffString =
       valuePassed && hasEndProp
         ? diff(value, result.value, {expand: this.expand})
         : '';
     return (
       matcherHint('.toHaveProperty', 'object', 'path', {
         secondArgument,
       } as MatcherHintOptions) +
       '\n\n' +
       `Expected the object:\n` +
       `  ${printReceived(object)}\n` +
       `To have a nested property:\n` +
       `  ${printExpected(keyPath)}\n` +
       (valuePassed
         ? `With a value of:\n  ${printExpected(value)}\n`
         : '') +
       (hasEndProp
         ? `Received:\n` +
           `  ${printReceived(result.value)}` +
           (diffString ? `\n\nDifference:\n\n${diffString}` : '')
         : traversedPath
         ? `Received:\n  ${RECEIVED_COLOR(
             'object',
           )}.${traversedPath}: ${printReceived(lastTraversedObject)}`
         : '')
     );
   };

function assertionErrorMessage(
  error: AssertionErrorWithStack,
  options: DiffOptions,
) {
  const {expected, actual, generatedMessage, message, operator, stack} = error;
  const diffString = diff(expected, actual, options);
  const hasCustomMessage = !generatedMessage;
  const operatorName = getOperatorName(operator, stack);
  const trimmedStack = stack
    .replace(message, '')
    .replace(/AssertionError(.*)/g, '');

  if (operatorName === 'doesNotThrow') {
    return (
      assertThrowingMatcherHint(operatorName) +
      '\n\n' +
      chalk.reset(`Expected the function not to throw an error.\n`) +
      chalk.reset(`Instead, it threw:\n`) +
      `  ${printReceived(actual)}` +
      chalk.reset(hasCustomMessage ? '\n\nMessage:\n  ' + message : '') +
      trimmedStack
    );
  }

  if (operatorName === 'throws') {
    return (
      assertThrowingMatcherHint(operatorName) +
      '\n\n' +
      chalk.reset(`Expected the function to throw an error.\n`) +
      chalk.reset(`But it didn't throw anything.`) +
      chalk.reset(hasCustomMessage ? '\n\nMessage:\n  ' + message : '') +
      trimmedStack
    );
  }

  return (
    assertMatcherHint(operator, operatorName) +
    '\n\n' +
    chalk.reset(`Expected value ${operatorMessage(operator)}`) +
    `  ${printExpected(expected)}\n` +
    chalk.reset(`Received:\n`) +
    `  ${printReceived(actual)}` +
    chalk.reset(hasCustomMessage ? '\n\nMessage:\n  ' + message : '') +
    (diffString ? `\n\nDifference:\n\n${diffString}` : '') +
    trimmedStack
  );
}

      : () => {
          const receivedType = getType(received);
          const expectedType = getType(expected);
          const suggestToEqual =
            receivedType === expectedType &&
            (receivedType === 'object' || expectedType === 'array') &&
            equals(received, expected, [iterableEquality]);
          const oneline = isOneline(expected, received);
          const diffString = diff(expected, received, {expand: this.expand});

          return (
            matcherHint('.toBe', undefined, undefined, {
              comment,
              isNot: false,
            }) +
            '\n\n' +
            `Expected: ${printExpected(expected)}\n` +
            `Received: ${printReceived(received)}` +
            (diffString && !oneline ? `\n\nDifference:\n\n${diffString}` : '') +
            (suggestToEqual ? ` ${SUGGEST_TO_EQUAL}` : '')
          );
        };

const formatMismatchedArgs = (expected: any, received: any): string => {
  const length = Math.max(expected.length, received.length);

  const printedArgs = [];
  for (let i = 0; i < length; i++) {
    if (!equals(expected[i], received[i], [iterableEquality])) {
      const oneline = isOneline(expected[i], received[i]);
      const diffString = diff(expected[i], received[i]);
      printedArgs.push(
        `  ${printExpected(expected[i])}\n` +
          `as argument ${i + 1}, but it was called with\n` +
          `  ${printReceived(received[i])}.` +
          (diffString && !oneline ? `\n\nDifference:\n\n${diffString}` : ''),
      );
    } else if (i >= expected.length) {
      printedArgs.push(
        `  Did not expect argument ${i + 1} ` +
          `but it was called with ${printReceived(received[i])}.`,
      );
    }
  }

  return printedArgs.join('\n');
};