Add an integration test for execution.setSubscriptions.

pkg/analysis_server/test/integration/coverage_test.dart

 // Copyright (c) 2017, 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 'dart:io';
 
 import 'package:analysis_server/src/services/correction/strings.dart';
 import 'package:path/path.dart' as path;
 import 'package:test/test.dart';
 
@@ skipping 23 matching lines @@
       new File(path.join(pathPrefix, 'test', 'integration', 'coverage.md'));
   List<String> lines = coverageFile.readAsLinesSync();
 
   // ## server domain
   Set<String> coveredDomains = lines
       .where((line) => line.startsWith('## ') && line.endsWith(' domain'))
       .map((line) =>
           line.substring('##'.length, line.length - 'domain'.length).trim())
       .toSet();
 
+  // Remove any ' (test failed)' suffixes.
+  lines = lines.map((String line) {
+    int index = line.indexOf('(');
+    return index != -1 ? line.substring(0, index).trim() : line;
+  }).toList();
+
   // - [ ] server.getVersion
   Set<String> allMembers = lines
       .where((line) => line.startsWith('- '))
       .map((line) => line.substring('- [ ]'.length).trim())
       .toSet();
   Set<String> coveredMembers = lines
       .where((line) => line.startsWith('- [x]'))
       .map((line) => line.substring('- [x]'.length).trim())
       .toSet();
 
@@ skipping 35 matching lines @@
 
   // validate no unexpected domains
   group('integration coverage', () {
     test('no unexpected domains', () {
       for (String domain in coveredDomains) {
         expect(api.domains.map((d) => d.name), contains(domain));
       }
     });
   });
 }