Update the version of zone.js to @0.6.12 that contains the new FakeAsyncTestZoneSpec.
The new fakeAsync zone handles errors better and clearPendingTimers() is no longer required to be called after handling an error and is deprecated.
The fakeAsync test zone will now throw an error if an XHR is attemtped within the test since that cannot be controlled synchronously in the test(Need to be mocked out with a service implementation that doesn't involve XHRs).
This commit also allows fakeAsync to wrap inject to make it consistent with async test zone.
BREAKING CHANGE:
inject can no longer wrap fakeAsync while fakeAsync can wrap inject. So the order in existing tests with inject and fakeAsync has to be switched as follows:
Before:
```
inject([...], fakeAsync((...) => {...}))
```
After:
```
fakeAsync(inject([...], (...) => {...}))
```
Closes#8142
Instead of using injectAsync and returning a promise, use the `async` function
to wrap tests. This will run the test inside a zone which does not complete
the test until all asynchronous tasks have been completed.
`async` may be used with the `inject` function, or separately.
BREAKING CHANGE:
`injectAsync` is now deprecated. Instead, use the `async` function
to wrap any asynchronous tests.
Before:
```
it('should wait for returned promises', injectAsync([FancyService], (service) => {
return service.getAsyncValue().then((value) => { expect(value).toEqual('async value'); });
}));
it('should wait for returned promises', injectAsync([], () => {
return somePromise.then(() => { expect(true).toEqual(true); });
}));
```
After:
```
it('should wait for returned promises', async(inject([FancyService], (service) => {
service.getAsyncValue().then((value) => { expect(value).toEqual('async value'); });
})));
// Note that if there is no injection, we no longer need `inject` OR `injectAsync`.
it('should wait for returned promises', async(() => {
somePromise.then() => { expect(true).toEqual(true); });
}));
```
Closes#7735
Vikram Subramanian
Julie Ralph