LiveTestWidgetsFlutterBinding class Null safety

A variant of TestWidgetsFlutterBinding for executing tests in the flutter run environment, on a device. This is intended to allow interactive test development.

This is not the way to run a remote-control test. To run a test on a device from a development computer, see the flutter_driver package and the flutter drive command.

When running tests using flutter run, consider adding the --use-test-fonts argument so that the fonts used match those used under flutter test. (This forces all text to use the "Ahem" font, which is a font that covers ASCII characters and gives them all the appearance of a square whose size equals the font size.)

This binding overrides the default SchedulerBinding behavior to ensure that tests work in the same way in this environment as they would under the AutomatedTestWidgetsFlutterBinding. To override this (and see intermediate frames that the test does not explicitly trigger), set framePolicy to LiveTestWidgetsFlutterBindingFramePolicy.fullyLive. (This is likely to make tests fail, though, especially if e.g. they test how many times a particular widget was built.) The default behavior is to show pumped frames and a few additional frames when pointers are triggered (to animate the pointer crosshairs).

This binding does not support the EnginePhase argument to pump. (There would be no point setting it to a value that doesn't trigger a paint, since then you could not see anything anyway.)

Inheritance
Implementers

Constructors

LiveTestWidgetsFlutterBinding()

Properties

accessibilityFeatures AccessibilityFeatures
The currently active set of AccessibilityFeatures. [...]
read-only, inherited
buildOwner BuildOwner?
The BuildOwner in charge of executing the build pipeline for the widget tree rooted at this binding.
read-only, inherited
channelBuffers ChannelBuffers
The low level buffering and dispatch mechanism for messages sent by plugins on the engine side to their corresponding plugin code on the framework side. [...]
read-only, inherited
clock Clock
The current time. [...]
read-only, override
currentFrameTimeStamp Duration
The time stamp for the frame currently being processed. [...]
read-only, inherited
currentSystemFrameTimeStamp Duration
The raw time stamp as provided by the engine to dart:ui.PlatformDispatcher.onBeginFrame for the frame currently being processed. [...]
read-only, inherited
debugBuildingDirtyElements bool
Whether we are currently in a frame. This is used to verify that frames are not scheduled redundantly. [...]
@protected, read / write, inherited
debugDidSendFirstFrameEvent bool
Whether the first frame has finished building. [...]
read-only, inherited
debugPrintOverride DebugPrintCallback
The value to set debugPrint to while tests are running. [...]
read-only, inherited
debugSamplingClock SamplingClock?
Overrides the sampling clock for debugging and testing. [...]
@protected, read-only, inherited
defaultBinaryMessenger TestDefaultBinaryMessenger
The default instance of BinaryMessenger. [...]
read-only, inherited
defaultTestTimeout Timeout
The default test timeout for tests when using this binding. [...]
read-only, override
deviceEventDispatcher HitTestDispatcher?
An object to which real device events should be routed. [...]
read / write
disableAnimations bool
The platform is requesting that animations be disabled or simplified. [...]
read-only, inherited
disableShadows bool
The value to set debugDisableShadows to while tests are running. [...]
@protected, read-only, inherited
endOfFrame Future<void>
Returns a Future that completes after the frame completes. [...]
read-only, inherited
firstFrameRasterized bool
Whether the Flutter engine has rasterized the first frame. [...]
read-only, inherited
focusedEditable EditableTextState?
The State of the current EditableText client of the onscreen keyboard. [...]
read / write, inherited
focusManager FocusManager
The object in charge of the focus tree. [...]
read-only, inherited
framePolicy LiveTestWidgetsFlutterBindingFramePolicy
The strategy for pumping and requesting new frames. [...]
read / write
framesEnabled bool
Whether frames are currently being scheduled when scheduleFrame is called. [...]
read-only, inherited
gestureArena GestureArenaManager
The gesture arenas used for disambiguating the meaning of sequences of pointer events.
final, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
hasScheduledFrame bool
Whether this scheduler has requested that handleBeginFrame be called soon.
read-only, inherited
imageCache ImageCache?
The singleton that implements the Flutter framework's image cache. [...]
read-only, inherited
inTest bool
Whether there is currently a test executing.
read-only, override
isRootWidgetAttached bool
Whether the renderViewElement has been initialized. [...]
read-only, inherited
keyboard HardwareKeyboard
The global singleton instance of HardwareKeyboard, which can be used to query keyboard states.
read-only, inherited
keyEventManager KeyEventManager
The global singleton instance of KeyEventManager, which is used internally to dispatch key messages.
read-only, inherited
lifecycleState AppLifecycleState?
Whether the application is visible, and if so, whether it is currently interactive. [...]
read-only, inherited
locked bool
Whether lockEvents is currently locking events. [...]
@protected, read-only, inherited
microtaskCount int
The number of outstanding microtasks in the queue.
read-only, override
mouseTracker MouseTracker
The object that manages state about currently connected mice, for hover notification.
read-only, inherited
overrideHttpClient bool
Determines whether the Dart HttpClient class should be overridden to always return a failure response. [...]
@protected, read-only, inherited
pipelineOwner PipelineOwner
The render tree's owner, which maintains dirty state for layout, composite, paint, and accessibility semantics.
read-only, inherited
platformDispatcher PlatformDispatcher
The ui.PlatformDispatcher to which this binding is bound. [...]
read-only, inherited
pointerEventSource TestBindingEventSource
The source of the current pointer event. [...]
read-only, inherited
pointerRouter PointerRouter
A router that routes all pointer events received from the engine.
final, inherited
pointerSignalResolver PointerSignalResolver
The resolver used for determining which widget handles a PointerSignalEvent.
final, inherited
registerTestTextInput bool
Determines whether the binding automatically registers testTextInput as a fake keyboard implementation. [...]
@protected, read-only, inherited
renderView RenderView
The render tree that's attached to the output surface.
read / write, inherited
renderViewElement Element?
The Element that is at the root of the hierarchy (and which wraps the RenderView object at the root of the rendering hierarchy). [...]
read-only, inherited
resamplingEnabled bool
Enable pointer event resampling for touch devices by setting this to true. [...]
read / write, inherited
restorationManager TestRestorationManager
The RestorationManager synchronizes the restoration data between engine and framework. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
samplingOffset Duration
Offset relative to current frame time that should be used for resampling. The samplingOffset is expected to be negative. Non-negative samplingOffset is allowed but will effectively disable resampling.
read / write, inherited
schedulerPhase SchedulerPhase
The phase that the scheduler is currently operating under.
read-only, inherited
schedulingStrategy SchedulingStrategy
The strategy to use when deciding whether to run a task or not. [...]
read / write, inherited
sendFramesToEngine bool
Whether frames produced by drawFrame are sent to the engine. [...]
read-only, inherited
showAppDumpInErrors bool
Whether to include the output of debugDumpApp() when reporting test failures.
read / write, inherited
systemFonts Listenable
Listenable that notifies when the available fonts on the system have changed. [...]
read-only, inherited
testTextInput TestTextInput
A stub for the system's onscreen keyboard. Callers must set the focusedEditable before using this value.
read-only, inherited
transientCallbackCount int
The current number of transient frame callbacks scheduled. [...]
read-only, inherited
waitUntilFirstFrameRasterized Future<void>
A future that completes when the Flutter engine has rasterized the first frame. [...]
read-only, inherited
window TestWindow
The main window to which this binding is bound. [...]
read-only, inherited

Methods

addObserver(WidgetsBindingObserver observer) → void
Registers the given object as a binding observer. Binding observers are notified when various application events occur, for example when the system locale changes. Generally, one widget in the widget tree registers itself as a binding observer, and converts the system state into inherited widgets. [...]
inherited
addPersistentFrameCallback(FrameCallback callback) → void
Adds a persistent frame callback. [...]
inherited
addPostFrameCallback(FrameCallback callback) → void
Schedule a callback for the end of this frame. [...]
inherited
addTime(Duration duration) → void
This method has no effect. [...]
@Deprecated('This method has no effect. ' 'This feature was deprecated after v2.6.0-1.0.pre.'), inherited
addTimingsCallback(TimingsCallback callback) → void
Add a TimingsCallback that receives FrameTiming sent from the engine. [...]
inherited
allowFirstFrame() → void
Called after deferFirstFrame to tell the framework that it is ok to send the first frame to the engine now. [...]
inherited
asyncBarrier() → void
This is called during test execution before and after the body has been executed. [...]
inherited
attachRootWidget(Widget rootWidget) → void
Takes a widget and attaches it to the renderViewElement, creating it if necessary. [...]
inherited
cancelFrameCallbackWithId(int id) → void
Cancels the transient frame callback with the given id. [...]
inherited
cancelPointer(int pointer) → void
Dispatch a PointerCancelEvent for the given pointer soon. [...]
inherited
computePlatformResolvedLocale(List<Locale> supportedLocales) Locale?
Computes the locale the current platform would resolve to. [...]
inherited
createBinaryMessenger() TestDefaultBinaryMessenger
Creates a default BinaryMessenger instance that can be used for sending platform messages. [...]
inherited
createImageCache() ImageCache
Creates the ImageCache singleton (accessible via imageCache). [...]
@protected, inherited
createRestorationManager() TestRestorationManager
Creates the RestorationManager instance available via restorationManager. [...]
inherited
createSemanticsUpdateBuilder() SemanticsUpdateBuilder
Creates an empty semantics update builder. [...]
inherited
createViewConfiguration() ViewConfiguration
Returns a ViewConfiguration configured for the RenderView based on the current environment. [...]
override
debugAssertNoTransientCallbacks(String reason) bool
Asserts that there are no registered transient callbacks; if there are, prints their locations and throws an exception. [...]
inherited
deferFirstFrame() → void
Tell the framework to not send the first frames to the engine until there is a corresponding call to allowFirstFrame. [...]
inherited
delayed(Duration duration) Future<void>
Delay for duration of time. [...]
override
dispatchAccessibilityFeaturesChanged() → void
Notify all the observers that the active set of AccessibilityFeatures has changed (using WidgetsBindingObserver.didChangeAccessibilityFeatures), giving them the features argument. [...]
@mustCallSuper, @protected, inherited
dispatchEvent(PointerEvent event, HitTestResult? hitTestResult) → void
Dispatch an event to pointerRouter and the path of a hit test result. [...]
override
dispatchLocalesChanged(List<Locale>? locales) → void
Notify all the observers that the locale has changed (using WidgetsBindingObserver.didChangeLocales), giving them the locales argument. [...]
@mustCallSuper, @protected, inherited
drawFrame() → void
Pump the build and rendering pipeline to generate a frame. [...]
inherited
ensureFrameCallbacksRegistered() → void
Ensures callbacks for PlatformDispatcher.onBeginFrame and PlatformDispatcher.onDrawFrame are registered.
@protected, inherited
ensureVisualUpdate() → void
Schedules a new frame using scheduleFrame if this object is not currently producing a frame. [...]
inherited
evict(String asset) → void
Called in response to the ext.flutter.evict service extension. [...]
inherited
globalToLocal(Offset point) Offset
Convert the given point from the global coordinate space to the local one. [...]
override
handleAccessibilityFeaturesChanged() → void
Called when the platform accessibility features change. [...]
inherited
handleAppLifecycleStateChanged(AppLifecycleState state) → void
Called when the application lifecycle state changes. [...]
inherited
handleBeginFrame(Duration? rawTimeStamp) → void
Called by the engine to prepare the framework to produce a new frame. [...]
override
handleDrawFrame() → void
Called by the engine to produce a new frame. [...]
override
handleEvent(PointerEvent event, HitTestEntry entry) → void
Override this method to receive events.
inherited
handleEventLoopCallback() bool
Execute the highest-priority task, if it is of a high enough priority. [...]
@visibleForTesting, inherited
handleLocaleChanged() → void
Called when the system locale changes. [...]
@mustCallSuper, @protected, inherited
handleMemoryPressure() → void
Called when the operating system notifies the application of a memory pressure situation. [...]
inherited
handleMetricsChanged() → void
Called when the system metrics change. [...]
inherited
handlePlatformBrightnessChanged() → void
Called when the platform brightness changes. [...]
inherited
handlePointerEvent(PointerEvent event) → void
Dispatch an event to the targets found by a hit test on its position. [...]
override
handlePointerEventForSource(PointerEvent event, {TestBindingEventSource source = TestBindingEventSource.device}) → void
Dispatch an event to the targets found by a hit test on its position, and remember its source as pointerEventSource. [...]
inherited
handlePopRoute() Future<void>
Called when the system pops the current route. [...]
@protected, inherited
handlePushRoute(String route) Future<void>
Called when the host tells the app to push a new route onto the navigator. [...]
@mustCallSuper, @protected, inherited
handleSystemMessage(Object systemMessage) Future<void>
Handler called for messages received on the SystemChannels.system message channel. [...]
inherited
handleTextScaleFactorChanged() → void
Called when the platform text scale factor changes. [...]
inherited
hitTest(HitTestResult result, Offset position) → void
Determine which HitTestTarget objects are located at a given position.
inherited
idle() Future<void>
Acts as if the application went idle. [...]
inherited
initInstances() → void
The initialization method. Subclasses override this method to hook into the platform and otherwise configure their services. Subclasses must call "super.initInstances()". [...]
inherited
initLicenses() → void
Adds relevant licenses to the LicenseRegistry. [...]
inherited
initMouseTracker([MouseTracker? tracker]) → void
Creates a MouseTracker which manages state about currently connected mice, for hover notification. [...]
@visibleForTesting, inherited
initRenderView() → void
Creates a RenderView object to be the root of the RenderObject rendering tree, and initializes it so that it will be rendered when the next frame is requested. [...]
override
initServiceExtensions() → void
Called when the binding is initialized, to register service extensions. [...]
inherited
instantiateImageCodec(Uint8List bytes, {int? cacheWidth, int? cacheHeight, bool allowUpscaling = false}) Future<Codec>
Calls through to dart:ui.instantiateImageCodec from ImageCache. [...]
inherited
localToGlobal(Offset point) Offset
Convert the given point from the local coordinate space to the global one. [...]
override
lockEvents(Future<void> callback()) Future<void>
Locks the dispatching of asynchronous events and callbacks until the callback's future completes. [...]
@protected, inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
performReassemble() Future<void>
This method is called by reassembleApplication to actually cause the application to reassemble, e.g. after a hot reload. [...]
inherited
postEvent(String eventKind, Map<String, dynamic> eventData) → void
All events dispatched by a BindingBase use this method instead of calling developer.postEvent directly so that tests for BindingBase can track which events were dispatched by overriding this method.
@protected, inherited
postTest() → void
Called by the testWidgets function after a test is executed.
override
pump([Duration? duration, EnginePhase newPhase = EnginePhase.sendSemanticsUpdate]) Future<void>
Triggers a frame sequence (build/layout/paint/etc), then flushes microtasks. [...]
override
readInitialLifecycleStateFromNativeWindow() → void
Initializes the lifecycleState with the dart:ui.SingletonFlutterWindow.initialLifecycleState. [...]
@protected, inherited
readTestInitialLifecycleStateFromNativeWindow() → void
Re-attempts the initialization of the lifecycle state after providing test values in TestWindow.initialLifecycleStateTestValue.
inherited
reassembleApplication() Future<void>
Cause the entire application to redraw, e.g. after a hot reload. [...]
inherited
registerBoolServiceExtension({required String name, required AsyncValueGetter<bool> getter, required AsyncValueSetter<bool> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes a single argument "enabled" which can have the value "true" or the value "false" or can be omitted to read the current value. (Any value other than "true" is considered equivalent to "false". Other arguments are ignored.) [...]
@protected, inherited
registerNumericServiceExtension({required String name, required AsyncValueGetter<double> getter, required AsyncValueSetter<double> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes a single argument with the same name as the method which, if present, must have a value that can be parsed by double.parse, and can be omitted to read the current value. (Other arguments are ignored.) [...]
@protected, inherited
registerServiceExtension({required String name, required ServiceExtensionCallback callback}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"). [...]
@protected, inherited
registerSignalServiceExtension({required String name, required AsyncCallback callback}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes no arguments and returns no value. [...]
@protected, inherited
registerStringServiceExtension({required String name, required AsyncValueGetter<String> getter, required AsyncValueSetter<String> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which optionally takes a single argument with the name "value". If the argument is omitted, the value is to be read, otherwise it is to be set. Returns the current value. [...]
@protected, inherited
removeObserver(WidgetsBindingObserver observer) bool
Unregisters the given observer. This should be used sparingly as it is relatively expensive (O(N) in the number of registered observers). [...]
inherited
removeTimingsCallback(TimingsCallback callback) → void
Removes a callback that was earlier added by addTimingsCallback.
inherited
reportExceptionNoticed(FlutterErrorDetails exception) → void
Called when the framework catches an exception, even if that exception is being handled by takeException. [...]
override
reset() → void
Called by the test framework at the beginning of a widget test to prepare the binding for the next test. [...]
inherited
resetEpoch() → void
Prepares the scheduler for a non-monotonic change to how time stamps are calculated. [...]
inherited
resetFirstFrameSent() → void
Call this to pretend that no frames have been sent to the engine yet. [...]
inherited
resetGestureBinding() → void
Reset states of GestureBinding. [...]
@protected, inherited
runAsync<T>(Future<T> callback(), {Duration additionalTime = const Duration(milliseconds: 1000)}) Future<T?>
Runs a callback that performs real asynchronous work. [...]
override
runTest(Future<void> testBody(), VoidCallback invariantTester, {String description = '', Duration? timeout}) Future<void>
Call the testBody inside a FakeAsync scope on which pump can advance time. [...]
override
scheduleAttachRootWidget(Widget rootWidget) → void
Schedules a Timer for attaching the root widget. [...]
@protected, inherited
scheduleForcedFrame() → void
Schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame. [...]
override
scheduleFrame() → void
If necessary, schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame. [...]
override
scheduleFrameCallback(FrameCallback callback, {bool rescheduling = false}) int
Schedules the given transient frame callback. [...]
inherited
scheduleTask<T>(TaskCallback<T> task, Priority priority, {String? debugLabel, Flow? flow}) Future<T>
Schedules the given task with the given priority and returns a Future that completes to the task's eventual return value. [...]
inherited
scheduleWarmUpFrame() → void
Schedule a frame to run as soon as possible, rather than waiting for the engine to request a frame in response to a system "Vsync" signal. [...]
inherited
setLocale(String languageCode, String countryCode) Future<void>
Artificially calls dispatchLocalesChanged on the Widget binding, then flushes microtasks. [...]
inherited
setLocales(List<Locale> locales) Future<void>
Artificially calls dispatchLocalesChanged on the Widget binding, then flushes microtasks.
inherited
setSemanticsEnabled(bool enabled) → void
Whether the render tree associated with this binding should produce a tree of SemanticsNode objects.
inherited
setSurfaceSize(Size? size) Future<void>
Artificially changes the surface size to size on the Widget binding, then flushes microtasks. [...]
inherited
setSystemUiChangeCallback(SystemUiChangeCallback? callback) → void
Sets the callback for the SystemChrome.systemUIChange method call received on the SystemChannels.platform channel. [...]
inherited
takeException() → dynamic
Returns the exception most recently caught by the Flutter framework. [...]
inherited
toString() String
A string representation of this object. [...]
inherited
unlocked() → void
Called by lockEvents when events get unlocked. [...]
inherited
withPointerEventSource(TestBindingEventSource source, VoidCallback task) → void
Sets pointerEventSource to source, runs task, then resets source to the previous value.
@protected, inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited