Analysis request `getReachableSources` (#24893).

pkg/analysis_server/test/domain_analysis_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.domain.analysis;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 37 matching lines @@
         serverPlugin,
         new AnalysisServerOptions(),
         new MockSdk(),
         InstrumentationService.NULL_SERVICE);
     handler = new AnalysisDomainHandler(server);
   });
 
   group('updateContent', testUpdateContent);
 
   group('AnalysisDomainHandler', () {
+    group('getReachableSources', () {
+      test('valid sources', () async {
+        String fileA = '/project/a.dart';
+        String fileB = '/project/b.dart';
+        resourceProvider.newFile(fileA, 'import "b.dart";');
+        resourceProvider.newFile(fileB, '');
+
+        server.setAnalysisRoots('0', ['/project/'], [], {});
+
+        await server.onAnalysisComplete;
+
+        var request =
+            new AnalysisGetReachableSourcesParams(fileA).toRequest('0');
+        var response = handler.handleRequest(request);
+
+        var json = response.toJson()[Response.RESULT];
+
+        // Sanity checks.
+        expect(json['sources'], hasLength(6));
+        expect(json['sources']['file:///project/a.dart'],
+            unorderedEquals(['dart:core', 'file:///project/b.dart']));
+        expect(json['sources']['file:///project/b.dart'], ['dart:core']);
+      });
+
+      test('invalid source', () async {
+        resourceProvider.newFile('/project/a.dart', 'import "b.dart";');
+        server.setAnalysisRoots('0', ['/project/'], [], {});
+
+        await server.onAnalysisComplete;
+
+        var request =
+            new AnalysisGetReachableSourcesParams('/does/not/exist.dart')
+                .toRequest('0');
+        var response = handler.handleRequest(request);
+        expect(response.error, isNotNull);
+        expect(response.error.code,
+            RequestErrorCode.GET_REACHABLE_SOURCES_INVALID_FILE);
+      });
+    });
+
     group('setAnalysisRoots', () {
       Response testSetAnalysisRoots(
           List<String> included, List<String> excluded) {
         Request request = new AnalysisSetAnalysisRootsParams(included, excluded)
             .toRequest('0');
         return handler.handleRequest(request);
       }
 
       group('excluded', () {
         test('excluded folder', () {
@@ skipping 667 matching lines @@
   test_beforeAnalysis() async {
     addTestFile('int V = 42;');
     createProject();
     // subscribe
     addAnalysisSubscription(AnalysisService.HIGHLIGHTS, testFile);
     // wait for analysis
     await waitForTasksFinished();
     expect(filesHighlights[testFile], isNotEmpty);
   }
 }