isRegistered property
Whether this TestTextInput is registered with SystemChannels.textInput.
The binding uses the register and unregister methods to control this value when TestWidgetsFlutterBinding.registerTestTextInput is true.
Implementation
bool get isRegistered => TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.checkMockMessageHandler(SystemChannels.textInput.name, _handleTextInputCall);