Create a "file repository" data structure to help interface analyzer and front_end code.

pkg/front_end/test/src/base/file_repository_test.dart

Index: pkg/front_end/test/src/base/file_repository_test.dart
diff --git a/pkg/front_end/test/src/base/file_repository_test.dart b/pkg/front_end/test/src/base/file_repository_test.dart
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+// 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 'package:analyzer/error/listener.dart';
+import 'package:analyzer/src/generated/parser.dart';
+import 'package:analyzer/src/summary/summarize_ast.dart';
+import 'package:front_end/src/base/file_repository.dart';
+import 'package:front_end/src/base/library_info.dart';
+import 'package:front_end/src/libraries_reader.dart';
+import 'package:front_end/src/scanner/errors.dart';
+import 'package:front_end/src/scanner/reader.dart';
+import 'package:front_end/src/scanner/scanner.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(FileRepositoryTest);
+  });
+}
+
+/// Generic URI resolver tests which do not depend on the particular path
+/// context in use.
+@reflectiveTest
+class FileRepositoryTest {
+  final fileRepository = new FileRepository();
+
+  test_contentsForPath() {
+    var path1 =
+        fileRepository.store(Uri.parse('file:///foo/bar.dart'), 'contents1');
+    var path2 =
+        fileRepository.store(Uri.parse('package:foo/bar.dart'), 'contents2');
+    expect(fileRepository.contentsForPath(path1), 'contents1');
+    expect(fileRepository.contentsForPath(path2), 'contents2');
+  }
+
+  test_pathForUri() {
+    var uri1 = Uri.parse('file:///foo/bar.dart');
+    var path1 = fileRepository.store(uri1, 'contents1');
+    var uri2 = Uri.parse('package:foo/bar.dart');
+    var path2 = fileRepository.store(uri2, 'contents2');
+    expect(fileRepository.pathForUri(uri1), path1);
+    expect(fileRepository.pathForUri(uri2), path2);
+  }
+
+  test_store() {
+    var uri = Uri.parse('file:///foo/bar.dart');
+    var path = fileRepository.store(uri, 'contents1');
+    expect(path, endsWith('.dart'));
+    expect(fileRepository.contentsForPath(path), 'contents1');
+    expect(fileRepository.store(uri, 'contents2'), path);
+    expect(fileRepository.contentsForPath(path), 'contents2');
+  }
+
+  test_uriForPath() {
+    var uri1 = Uri.parse('file:///foo/bar.dart');
+    var path1 = fileRepository.store(uri1, 'contents1');
+    var uri2 = Uri.parse('package:foo/bar.dart');
+    var path2 = fileRepository.store(uri2, 'contents2');
+    expect(fileRepository.uriForPath(path1), uri1);
+    expect(fileRepository.uriForPath(path2), uri2);
+  }
+}