angular-docs-cn/modules/@angular/core/testing/async.dart

// This symbol is not used on the Dart side. This exists just as a stub.
async(Function fn) {
  throw 'async() test wrapper not available for Dart.';
}
chore(testing): Refactor test methods to have a uniform interface. Remove FunctionWithParamTokens. All test wrappers async, fakeAsync and inject now return just a Function instead of FunctionWithParamTokens. This makes them directly consumable by the test framework. Also the test framework code does not have to handle a union of Function and FunctionWithParamTokens everywhere. The Function returned by the above methods are considered asynchronous by the test framework if they return a Promise, synchronous otherwise. Closes #8257 2016-04-26 16:06:50 -04:00			`// This symbol is not used on the Dart side. This exists just as a stub.`
			`async(Function fn) {`
			`throw 'async() test wrapper not available for Dart.';`
			`}`