Function printWarning

testing/console-logging-setup.js:69–95

* Prints a warning when a console error is detected during a test. * @param {*} messages One or more error messages

(...messages)

 * @param {*} messages One or more error messages
 */
function printWarning(...messages) {
  const message = messages.join(' ');

  const index = indexOfExpectedMessage(message);
  if (index != -1) {
    expectedAsyncErrors.splice(index, 1);
    return;
  }

  const errorMessage = message.split('\n', 1)[0]; // First line.
  const helpMessage =
    '    The test "' +
    testName +
    '"' +
    ' resulted in a call to console.error. (See above line.)\n' +
    '    ⤷ If the error is not expected, fix the code that generated ' +
    'the error.\n' +
    '    ⤷ If the error is expected (and synchronous), use the following ' +
    'pattern to wrap the test code that generated the error:\n' +
    "        'allowConsoleError(() => { <code that generated the " +
    "error> });'\n" +
    '    ⤷ If the error is expected (and asynchronous), use the ' +
    'following pattern at the top of the test:\n' +
    "        'expectAsyncConsoleError(<string or regex>[, <number of" +
    ' times the error message repeats>]);';
  originalConsoleError(errorMessage + "'\n" + helpMessage);
}

/**
 * Used during normal test execution, to detect unexpected console errors.