Compute files referencing an externally defined name.

pkg/analyzer/test/src/dart/analysis/driver_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.
 
 library analyzer.test.driver;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 382 matching lines @@
 
     var f = result.unit.declarations[0] as FunctionDeclaration;
     expect(f.name.staticType.toString(), '() → int');
     expect(f.returnType.type.toString(), 'int');
 
     // The same result is also received through the stream.
     await _waitForIdle();
     expect(allResults, [result]);
   }
 
+  test_getFilesReferencingName() async {
+    var a = _p('/test/bin/a.dart');
+    var b = _p('/test/bin/b.dart');
+    var c = _p('/test/bin/c.dart');
+    var d = _p('/test/bin/d.dart');
+    var e = _p('/test/bin/e.dart');
+
+    provider.newFile(a, 'class A {}');
+    provider.newFile(b, "import 'a.dart'; A a;");
+    provider.newFile(c, "import 'a.dart'; var a = new A();");
+    provider.newFile(d, "classs A{} A a;");
+    provider.newFile(e, "import 'a.dart'; main() {}");
+
+    driver.addFile(a);
+    driver.addFile(b);
+    driver.addFile(c);
+    driver.addFile(d);
+    driver.addFile(e);
+
+    // 'b.dart' references an external 'A'.
+    // 'c.dart' references an external 'A'.
+    // 'd.dart' references the local 'A'.
+    // 'e.dart' does not reference 'A' at all.
+    List<String> files = await driver.getFilesReferencingName('A');
+    expect(files, unorderedEquals([b, c]));
+
+    // We get the same results second time.
+    List<String> files2 = await driver.getFilesReferencingName('A');
+    expect(files2, unorderedEquals([b, c]));
+  }
+
   test_getResult_constants_defaultParameterValue_localFunction() async {
     var a = _p('/test/bin/a.dart');
     var b = _p('/test/bin/b.dart');
     provider.newFile(a, 'const C = 42;');
     provider.newFile(
         b,
         r'''
 import 'a.dart';
 main() {
   foo({int p: C}) {}
@@ skipping 777 matching lines @@
   String _p(String path) => provider.convertPath(path);
 
   Future<Null> _waitForIdle() async {
     await idleStatusMonitor.signal;
   }
 
   static String _md5(String content) {
     return hex.encode(md5.convert(UTF8.encode(content)).bytes);
   }
 }