NgTestStabilizer class abstract

Abstraction around services that change the state of the DOM asynchronously.

One strategy of testing Angular components is to interact with their emitted DOM as-if you were a user with a browser, and assert the state of the DOM instead of the state of the component. For example, a toggle button that switches between 'Yes' and 'No' when clicked:

testToggleButton(ButtonElement button) {
  expect(button.text, 'Yes');
  button.click();
  expect(button.text, 'No');
}
```dart

In the case of Angular, and of other DOM-related libraries, however, the
changes are not always applied immediately (synchronously). Instead, we need
a contract that lets us `await` any possible changes, and then assert state:
```dart
testToggleButton(ButtonElement button, NgTestStabilizer dom) async {
  expect(button.text, 'Yes');
  await dom.update(() => button.click());
  expect(button.text, 'No');
}

Either extend or implement NgTestStabilizer.

Implementers

• FakeTimeNgZoneStabilizer
• RealTimeNgZoneStabilizer

Constructors

NgTestStabilizer()

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

isStable → bool

Whether this stabilizer is currently stable.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

stabilize({void runAndTrackSideEffects()?, int threshold = 100}) → Future<void>

Runs update until it completes with false, reporting stabilized.

stabilizeWithThreshold(int threshold) → Future<void>

Run update until the stabilizer is stable or threshold exceeds.

toString() → String

A string representation of this object.

inherited

update([void runAndTrackSideEffects()?]) → Future<bool>

Returns a future that completes after processing DOM update events.

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

alwaysStable → const NgTestStabilizer