Function _expectWarning

test/common/index.js:674–700

(name, expected, code)

}

function _expectWarning(name, expected, code) {
  if (typeof expected === 'string') {
    expected = [[expected, code]];
  } else if (!Array.isArray(expected)) {
    expected = Object.entries(expected).map(([a, b]) => [b, a]);
  } else if (expected.length !== 0 && !Array.isArray(expected[0])) {
    expected = [[expected[0], expected[1]]];
  }
  // Deprecation codes are mandatory, everything else is not.
  if (name === 'DeprecationWarning') {
    expected.forEach(([_, code]) => assert(code, `Missing deprecation code: ${expected}`));
  }
  return mustCall((warning) => {
    const expectedProperties = expected.shift();
    if (!expectedProperties) {
      assert.fail(`Unexpected extra warning received: ${warning}`);
    }
    const [ message, code ] = expectedProperties;
    assert.strictEqual(warning.name, name);
    if (typeof message === 'string') {
      assert.strictEqual(warning.message, message);
    } else {
      assert.match(warning.message, message);
    }
    assert.strictEqual(warning.code, code);
  }, expected.length);
}

let catchWarning;