Use "pub list-package-dirs" to resolve package URIs in analysis server.

pkg/analysis_server/test/package_map_provider_test.dart

Index: pkg/analysis_server/test/package_map_provider_test.dart
diff --git a/pkg/analysis_server/test/package_map_provider_test.dart b/pkg/analysis_server/test/package_map_provider_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f154e32ab146579853add7648810c87db69a9240
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+++ b/pkg/analysis_server/test/package_map_provider_test.dart
@@ -0,0 +1,47 @@
+// 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(
+            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));
+      });
+
+      test('ignore nonexistent folder', () {
+        String packageName = 'foo';
+        String folderPath = '/path/to/folder';
+        Map<String, Folder> result = packageMapProvider.parsePackageMap(
+            JSON.encode({'packages': {packageName: folderPath}}));
+        expect(result, hasLength(0));
+      });
+    });
+  });
+}