Added tests for docs.dart

tools/dom/docs/test/docs_test.dart

+// Copyright (c) 2013, 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 docs_test;
+
+import 'dart:io';
+
+import '../../../../pkg/unittest/lib/unittest.dart';
+
+import '../bin/docs.dart';
+import '../lib/docs.dart';
+
+final testJsonPath = scriptDir.append('test.json').canonicalize();
+
+main() {
+  test('Ensure that docs.json is up to date', () {
+    var oldJson = new File.fromPath(json_path);
+    var testJson = new File.fromPath(testJsonPath);
+
+    // We should find a json file where we expect it.
+    expect(oldJson.existsSync(), isTrue);
+
+    // Save the last modified time to check it at the end.
+    var oldJsonModified = oldJson.lastModifiedSync();
+
+    // There should be no test file yet.
+    if (testJson.existsSync()) testJson.deleteSync();
+    expect(testJson.existsSync(), isFalse);
+
+    expect(convert(lib_path, testJsonPath)
+        .then((bool anyErrors) {
+      expect(anyErrors, isFalse);
+
+      // We should have a file now.
+      expect(testJson.existsSync(), isTrue);
+
+      // Ensure that there's nothing different between the new JSON and old.
+      expect(testJson.readAsStringSync(), equals(oldJson.readAsStringSync()));
+
+      // Ensure that the old JSON file didn't actually change.
+      expect(oldJsonModified, equals(oldJson.lastModifiedSync()));
+
+      // Clean up.
+      if (testJson.existsSync()) {
+        testJson.deleteSync();
+      }
+      expect(testJson.existsSync(), isFalse);
+    }), completes);
+  });
+}