Function matchObjectShape

packages/core/test/render3/matchers.ts:23–56

(
  name: string,
  shapePredicate: (obj: any) => obj is T,
  expected: Partial<T> = {},
)

 * @param expected Expected set of properties to be found on the object.
 */
export function matchObjectShape<T>(
  name: string,
  shapePredicate: (obj: any) => obj is T,
  expected: Partial<T> = {},
): jasmine.AsymmetricMatcher<T> {
  const matcher = function () {};
  let _actual: any = null;
  let _matcherUtils: jasmine.MatchersUtil = null!;

  matcher.asymmetricMatch = function (actual: any, matcherUtils: jasmine.MatchersUtil) {
    _actual = actual;
    _matcherUtils = matcherUtils;
    if (!shapePredicate(actual)) return false;
    for (const key in expected) {
      if (expected.hasOwnProperty(key) && !matcherUtils.equals(actual[key], expected[key])) {
        return false;
      }
    }
    return true;
  };
  matcher.jasmineToString = function (pp: (value: any) => string) {
    let errors: string[] = [];
    if (!_actual || typeof _actual !== 'object') {
      return `Expecting ${pp(expect)} got ${pp(_actual)}`;
    }
    for (const key in expected) {
      if (expected.hasOwnProperty(key) && !_matcherUtils.equals(_actual[key], expected[key]))
        errors.push(`\n  property obj.${key} to equal ${expected[key]} but got ${_actual[key]}`);
    }
    return errors.join('\n');
  };

  return matcher;
}

/**
 * Asymmetric matcher which matches a `TView` of a given shape.