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

63 lines
2.0 KiB
TypeScript

/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
declare var global: any;
var _global = <any>(typeof window === 'undefined' ? global : window);
/**
* Wraps a test function in an asynchronous test zone. The test will automatically
* complete when all asynchronous calls within this zone are done. Can be used
* to wrap an {@link inject} call.
*
* Example:
*
* ```
* it('...', async(inject([AClass], (object) => {
* object.doSomething.then(() => {
* expect(...);
* })
* });
* ```
*
* @stable
*/
export function async(fn: Function): (done: any) => any {
// If we're running using the Jasmine test framework, adapt to call the 'done'
// function when asynchronous activity is finished.
if (_global.jasmine) {
return (done: any) => {
runInTestZone(fn, done, (err: string | Error) => {
if (typeof err === 'string') {
return done.fail(new Error(<string>err));
} else {
done.fail(err);
}
});
};
}
// Otherwise, return a promise which will resolve when asynchronous activity
// is finished. This will be correctly consumed by the Mocha framework with
// it('...', async(myFn)); or can be used in a custom framework.
return () => new Promise<void>((finishCallback, failCallback) => {
runInTestZone(fn, finishCallback, failCallback);
});
}
function runInTestZone(fn: Function, finishCallback: Function, failCallback: Function) {
var AsyncTestZoneSpec = (Zone as any /** TODO #9100 */)['AsyncTestZoneSpec'];
if (AsyncTestZoneSpec === undefined) {
throw new Error(
'AsyncTestZoneSpec is needed for the async() test helper but could not be found. ' +
'Please make sure that your environment includes zone.js/dist/async-test.js');
}
var testZoneSpec = new AsyncTestZoneSpec(finishCallback, failCallback, 'test');
var testZone = Zone.current.fork(testZoneSpec);
return testZone.run(fn);
}