runtime/observatory/tests/service/pause_on_exceptions_test.dart

// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:observatory/service_io.dart';
import 'package:test/test.dart';
import 'test_helper.dart';
import 'dart:async';

doThrow() {
  throw "TheException";
}

doCaught() {
  try {
    doThrow();
  } catch (e) {}
  return "end of doCaught";
}

doUncaught() {
  doThrow();
  return "end of doUncaught";
}

var tests = <IsolateTest>[
  (Isolate isolate) async {
    Library lib = await isolate.rootLibrary.reload() as Library;

    var onPaused = null;
    var onResume = null;

    var stream = await isolate.vm.getEventStream(VM.kDebugStream);
    var subscription;
    subscription = stream.listen((ServiceEvent event) {
      print("Event $event");
      if (event.kind == ServiceEvent.kPauseException) {
        if (onPaused == null) throw "Unexpected pause event $event";
        var t = onPaused;
        onPaused = null;
        t.complete(event);
      }
      if (event.kind == ServiceEvent.kResume) {
        if (onResume == null) throw "Unexpected resume event $event";
        var t = onResume;
        onResume = null;
        t.complete(event);
      }
    });

    test(String pauseMode, String expression, bool shouldPause,
        bool shouldBeCaught) async {
      print("Evaluating $expression with pause on $pauseMode exception");

      expect(
          (await isolate.setIsolatePauseMode(pauseMode)) is DartError, isFalse);

      var t;
      if (shouldPause) {
        t = new Completer();
        onPaused = t;
      }
      var fres = lib.evaluate(expression);
      if (shouldPause) {
        await t.future;

        var stack = await isolate.getStack();
        expect(stack['frames'][0].function.name, equals('doThrow'));
        // Ugh, no .line. expect(stack['frames'][0].location.line, equals(17));

        t = new Completer();
        onResume = t;
        isolate.resume();
        await t.future;
      }

      dynamic res = await fres;
      print(res);
      if (shouldBeCaught) {
        expect(res.isInstance, isTrue);
        expect(res.isString, isTrue);
        expect(res.valueAsString, equals("end of doCaught"));
      } else {
        expect(res.isError, isTrue);
        await res.load(); // Weird?
        expect(res.exception.isInstance, isTrue);
        expect(res.exception.isString, isTrue);
        expect(res.exception.valueAsString, equals("TheException"));
      }
    }

    await test("All", "doCaught()", true, true);
    await test("All", "doUncaught()", true, false);

    await test("Unhandled", "doCaught()", false, true);
    await test("Unhandled", "doUncaught()", true, false);

    await test("None", "doCaught()", false, true);
    await test("None", "doUncaught()", false, false);

    subscription.cancel();
  },
];

main(args) => runIsolateTests(args, tests);