Simple selector engine

[kubawojtczakLC]

No description provided.

[bartekpacia]

I'll assume this issue is about the part of API surface of package:maestro_test concerned with finding native widgets. Probably this comment would fit better into #30.

From what I understand, we want to provide both:

• basic functionality

  Similar to what package:flutter_test offers (but for the underlying native platform). Example of how I image it to look like:

  // example/lib/integration_test/app_test.dart
  import 'package:maestro_test/maestro_test.dart';
  
  
  final maestro = Maestro.forTest();
  const notificationBodyText = 'Notification body sent by Maestro example app';
  // ...
  
  // Send notification by tapping on a button
  await tester.tap(find.text("Show notification"));
  
  // Verify that our counter starts at 0.
  maestro.openNotifications();
  
   // "native"-kind methods are provided by Maestro
  expectLater( 
    await nativeFind.text(notificationBodyText),
    findsOneNativeWidget, 
  );
  
  // Open the notification by tapping on the text that is it
  await maestro.tap(nativeFind.text(notificationBodyText));
  
  expect(nativeFind.text('cuba voytchack'), findsNoNativeWidgets); // provided by Maestro as well
  
  await maestro.pressBack(); // hide notification shade
  
  await maestro.tap(nativeFind.byIcon(Icons.add)); // problem – how to map icon names from Flutter to native platform?

• convenience functionlity

  Such as signInWithFacebook(email, password) (which automatically sign in using the default Facebook WebView) or resetPassword(senderEmail) (which opens Gmail app, finds the mail from senderEmail and clicks the reset password link). They encapsulate whole flows into a single, simple method call and are composed using basic functionalities.

I think that we should implement the basic functionality first and then figure how to create whole flows out of them. We have to encode native finders into a JSON, send it to the instrumentation server, and then recreate it somehow into calls to native BySelector.

[bartekpacia]

Kind of done for now.

The paragraph and code snippet about native selectors might be useful in the future.

[github-actions]

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