Allow multiple dirs per package in the data returned by "pub list".

pkg/analysis_server/test/package_map_provider_test.dart

 // Copyright (c) 2014, 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.
 
 library test.package.map.provider;
 
 import 'dart:convert';
 
 import 'package:analysis_server/src/package_map_provider.dart';
 import 'package:unittest/unittest.dart';
 import 'package:analysis_server/src/resource.dart';
 
 main() {
   groupSep = ' | ';
 
   group('PubPackageMapProvider', () {
     group('parsePackageMap', () {
       MemoryResourceProvider resourceProvider;
       PubPackageMapProvider packageMapProvider;
 
       setUp(() {
         resourceProvider = new MemoryResourceProvider();
         packageMapProvider = new PubPackageMapProvider(resourceProvider);
       });
 
       test('normal folder', () {
         String packageName = 'foo';
         String folderPath = '/path/to/folder';
         resourceProvider.newFolder(folderPath);
-        Map<String, Folder> result = packageMapProvider.parsePackageMap(
+        Map<String, List<Folder>> result = packageMapProvider.parsePackageMap(
             JSON.encode({'packages': {packageName: folderPath}}));
         expect(result, hasLength(1));
         expect(result.keys, contains(packageName));
-        expect(result[packageName], new isInstanceOf<Folder>());
-        expect(result[packageName].path, equals(folderPath));
+        expect(result[packageName], hasLength(1));
+        expect(result[packageName][0], new isInstanceOf<Folder>());
+        expect(result[packageName][0].path, equals(folderPath));
       });
 
       test('ignore nonexistent folder', () {
         String packageName = 'foo';
         String folderPath = '/path/to/folder';
-        Map<String, Folder> result = packageMapProvider.parsePackageMap(
+        Map<String, List<Folder>> result = packageMapProvider.parsePackageMap(
             JSON.encode({'packages': {packageName: folderPath}}));
         expect(result, hasLength(0));
       });
+
+      test('package maps to list', () {
+        String packageName = 'foo';
+        String folderPath1 = '/path/to/folder1';
+        String folderPath2 = '/path/to/folder2';
+        resourceProvider.newFolder(folderPath1);
+        resourceProvider.newFolder(folderPath2);
+        Map<String, List<Folder>> result = packageMapProvider.parsePackageMap(
+            JSON.encode({'packages': {packageName: [folderPath1, folderPath2]}}));
+        expect(result, hasLength(1));
+        expect(result.keys, contains(packageName));
+        expect(result[packageName], hasLength(2));
+        for (int i = 0; i < 2; i++) {
+          expect(result[packageName][i], new isInstanceOf<Folder>());
+          expect(result[packageName][i].path, isIn([folderPath1, folderPath2]));
+        }
+      });
     });
   });
 }