Respect setLibraryDebuggable

runtime/observatory/tests/service/set_library_debuggable_test.dart

+// Copyright (c) 2016, 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.
+// VMOptions=--error_on_bad_type --error_on_bad_override
+
+library set_library_debuggable_test;
+
+import 'dart:developer';
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'service_test_common.dart';
+import 'test_helper.dart';
+
+const LINE_A = 20;
+const LINE_B = 21;
+const LINE_C = 22;
+
+testMain() async {
+  debugger();
+  print('hi');   // LINE_A.
+  print('yep');  // LINE_B.
+  print('zoo');  // LINE_C.
+}
+
+var tests = [
+  (Isolate isolate) async {
+    await isolate.reload();
+    Library dartCore = isolate.libraries.firstWhere(
+      (Library library) => library.uri == 'dart:core');
+    await dartCore.load();
+    expect(dartCore.debuggable, equals(true));
+  },
+  stoppedInFunction('testMain', contains:true),
+  stoppedAtLine(LINE_A),
+  stepInto,
+  stoppedInFunction('print'),
+  stepOut,
+  stoppedInFunction('testMain', contains:true),
+  stoppedAtLine(LINE_B),
+  (Isolate isolate) async {
+    // Mark 'dart:core' as not debuggable.
+    await isolate.reload();
+    Library dartCore = isolate.libraries.firstWhere(
+      (Library library) => library.uri == 'dart:core');
+    await dartCore.load();
+    expect(dartCore.debuggable, equals(true));
+    var setDebugParams = {
+      'libraryId': dartCore.id,
+      'isDebuggable': false,
+    };
+    Map<String, dynamic> result =
+        await isolate.invokeRpcNoUpgrade('setLibraryDebuggable',
+                                         setDebugParams);
+    expect(result['type'], equals('Success'));
+    await dartCore.reload();
+    expect(dartCore.debuggable, equals(false));
+  },
+  stoppedInFunction('testMain', contains:true),
+  stoppedAtLine(LINE_B),
+  stepInto,
+  stoppedInFunction('testMain', contains:true),
+  stoppedAtLine(LINE_C),
+];
+
+main(args) async => runIsolateTests(args, tests, testeeConcurrent: testMain);