@angular/core
Version:
Angular - the core framework
102 lines • 13.2 kB
JavaScript
/**
* @license
* Copyright Google LLC 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
*/
const _global = (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(...);
* })
* });
* ```
*
*
*/
export function asyncFallback(fn) {
// If we're running using the Jasmine test framework, adapt to call the 'done'
// function when asynchronous activity is finished.
if (_global.jasmine) {
// Not using an arrow function to preserve context passed from call site
return function (done) {
if (!done) {
// if we run beforeEach in @angular/core/testing/testing_internal then we get no done
// fake it here and assume sync.
done = function () { };
done.fail = function (e) {
throw e;
};
}
runInTestZone(fn, this, done, (err) => {
if (typeof err === 'string') {
return done.fail(new Error(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.
// Not using an arrow function to preserve context passed from call site
return function () {
return new Promise((finishCallback, failCallback) => {
runInTestZone(fn, this, finishCallback, failCallback);
});
};
}
function runInTestZone(fn, context, finishCallback, failCallback) {
const currentZone = Zone.current;
const AsyncTestZoneSpec = Zone['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');
}
const ProxyZoneSpec = Zone['ProxyZoneSpec'];
if (ProxyZoneSpec === undefined) {
throw new Error('ProxyZoneSpec is needed for the async() test helper but could not be found. ' +
'Please make sure that your environment includes zone.js/dist/proxy.js');
}
const proxyZoneSpec = ProxyZoneSpec.get();
ProxyZoneSpec.assertPresent();
// We need to create the AsyncTestZoneSpec outside the ProxyZone.
// If we do it in ProxyZone then we will get to infinite recursion.
const proxyZone = Zone.current.getZoneWith('ProxyZoneSpec');
const previousDelegate = proxyZoneSpec.getDelegate();
proxyZone.parent.run(() => {
const testZoneSpec = new AsyncTestZoneSpec(() => {
// Need to restore the original zone.
currentZone.run(() => {
if (proxyZoneSpec.getDelegate() == testZoneSpec) {
// Only reset the zone spec if it's sill this one. Otherwise, assume it's OK.
proxyZoneSpec.setDelegate(previousDelegate);
}
finishCallback();
});
}, (error) => {
// Need to restore the original zone.
currentZone.run(() => {
if (proxyZoneSpec.getDelegate() == testZoneSpec) {
// Only reset the zone spec if it's sill this one. Otherwise, assume it's OK.
proxyZoneSpec.setDelegate(previousDelegate);
}
failCallback(error);
});
}, 'test');
proxyZoneSpec.setDelegate(testZoneSpec);
});
return Zone.current.runGuarded(fn, context);
}
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The test will automatically\n * complete when all asynchronous calls within this zone are done. Can be used\n * to wrap an {@link inject} call.\n *\n * Example:\n *\n * ```\n * it('...', async(inject([AClass], (object) => {\n *   object.doSomething.then(() => {\n *     expect(...);\n *   })\n * });\n * ```\n *\n *\n */\nexport function asyncFallback(fn: Function): (done: any) => any {\n  // If we're running using the Jasmine test framework, adapt to call the 'done'\n  // function when asynchronous activity is finished.\n  if (_global.jasmine) {\n    // Not using an arrow function to preserve context passed from call site\n    return function(this: unknown, done: any) {\n      if (!done) {\n        // if we run beforeEach in @angular/core/testing/testing_internal then we get no done\n        // fake it here and assume sync.\n        done = function() {};\n        done.fail = function(e: any) {\n          throw e;\n        };\n      }\n      runInTestZone(fn, this, done, (err: any) => {\n        if (typeof err === 'string') {\n          return done.fail(new Error(err));\n        } else {\n          done.fail(err);\n        }\n      });\n    };\n  }\n  // Otherwise, return a promise which will resolve when asynchronous activity\n  // is finished. This will be correctly consumed by the Mocha framework with\n  // it('...', async(myFn)); or can be used in a custom framework.\n  // Not using an arrow function to preserve context passed from call site\n  return function(this: unknown) {\n    return new Promise<void>((finishCallback, failCallback) => {\n      runInTestZone(fn, this, finishCallback, failCallback);\n    });\n  };\n}\n\nfunction runInTestZone(\n    fn: Function, context: any, finishCallback: Function, failCallback: Function) {\n  const currentZone = Zone.current;\n  const AsyncTestZoneSpec = (Zone as any)['AsyncTestZoneSpec'];\n  if (AsyncTestZoneSpec === undefined) {\n    throw new Error(\n        'AsyncTestZoneSpec is needed for the async() test helper but could not be found. ' +\n        'Please make sure that your environment includes zone.js/dist/async-test.js');\n  }\n  const ProxyZoneSpec = (Zone as any)['ProxyZoneSpec'] as {\n    get(): {setDelegate(spec: ZoneSpec): void; getDelegate(): ZoneSpec;};\n    assertPresent: () => void;\n  };\n  if (ProxyZoneSpec === undefined) {\n    throw new Error(\n        'ProxyZoneSpec is needed for the async() test helper but could not be found. ' +\n        'Please make sure that your environment includes zone.js/dist/proxy.js');\n  }\n  const proxyZoneSpec = ProxyZoneSpec.get();\n  ProxyZoneSpec.assertPresent();\n  // We need to create the AsyncTestZoneSpec outside the ProxyZone.\n  // If we do it in ProxyZone then we will get to infinite recursion.\n  const proxyZone = Zone.current.getZoneWith('ProxyZoneSpec');\n  const previousDelegate = proxyZoneSpec.getDelegate();\n  proxyZone!.parent!.run(() => {\n    const testZoneSpec: ZoneSpec = new AsyncTestZoneSpec(\n        () => {\n          // Need to restore the original zone.\n          currentZone.run(() => {\n            if (proxyZoneSpec.getDelegate() == testZoneSpec) {\n              // Only reset the zone spec if it's sill this one. Otherwise, assume it's OK.\n              proxyZoneSpec.setDelegate(previousDelegate);\n            }\n            finishCallback();\n          });\n        },\n        (error: any) => {\n          // Need to restore the original zone.\n          currentZone.run(() => {\n            if (proxyZoneSpec.getDelegate() == testZoneSpec) {\n              // Only reset the zone spec if it's sill this one. Otherwise, assume it's OK.\n              proxyZoneSpec.setDelegate(previousDelegate);\n            }\n            failCallback(error);\n          });\n        },\n        'test');\n    proxyZoneSpec.setDelegate(testZoneSpec);\n  });\n  return Zone.current.runGuarded(fn, context);\n}\n"]}