Ian Hickson 91dd969966 Refactor the test framework (#3622) ... * Refactor widget test framework Instead of: ```dart test("Card Collection smoke test", () { testWidgets((WidgetTester tester) { ``` ...you now say: ```dart testWidgets("Card Collection smoke test", (WidgetTester tester) { ``` Instead of: ```dart expect(tester, hasWidget(find.text('hello'))); ``` ...you now say: ```dart expect(find.text('hello'), findsOneWidget); ``` Instead of the previous API (exists, widgets, widget, stateOf, elementOf, etc), you now have the following comprehensive API. All these are functions that take a Finder, except the all* properties. * `any()` - true if anything matches, c.f. `Iterable.any` * `allWidgets` - all the widgets in the tree * `widget()` - the one and only widget that matches the finder * `firstWidget()` - the first widget that matches the finder * `allElements` - all the elements in the tree * `element()` - the one and only element that matches the finder * `firstElement()` - the first element that matches the finder * `allStates` - all the `State`s in the tree * `state()` - the one and only state that matches the finder * `firstState()` - the first state that matches the finder * `allRenderObjects` - all the render objects in the tree * `renderObject()` - the one and only render object that matches the finder * `firstRenderObject()` - the first render object that matches the finder There's also `layers' which returns the list of current layers. `tap`, `fling`, getCenter, getSize, etc, take Finders, like the APIs above, and expect there to only be one matching widget. The finders are: * `find.text(String text)` * `find.widgetWithText(Type widgetType, String text)` * `find.byKey(Key key)` * `find.byType(Type type)` * `find.byElementType(Type type)` * `find.byConfig(Widget config)` * `find.byWidgetPredicate(WidgetPredicate predicate)` * `find.byElementPredicate(ElementPredicate predicate)` The matchers (for `expect`) are: * `findsNothing` * `findsWidgets` * `findsOneWidget` * `findsNWidgets(n)` * `isOnStage` * `isOffStage` * `isInCard` * `isNotInCard` Benchmarks now use benchmarkWidgets instead of testWidgets. Also, for those of you using mockers, `serviceMocker` now automatically handles the binding initialization. This patch also: * changes how tests are run so that we can more easily swap the logic out for a "real" mode instead of FakeAsync. * introduces CachingIterable. * changes how flutter_driver interacts with the widget tree to use the aforementioned new API rather than ElementTreeTester, which is gone. * removes ElementTreeTester. * changes the semantics of a test for scrollables because we couldn't convince ourselves that the old semantics made sense; it only worked before because flushing the microtasks after every event was broken. * fixes the flushing of microtasks after every event. * Reindent the tests * Fix review comments		2016-04-29 13:23:27 -07:00
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widget_tester_test.dart	Refactor the test framework (#3622)	2016-04-29 13:23:27 -07:00