Move embedder locator and convert context builder to use the new API

pkg/analyzer/test/src/context/builder_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.src.context.context_builder_test;
 
 import 'dart:io' as io;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/context/builder.dart';
 import 'package:analyzer/src/context/source.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:package_config/packages.dart';
 import 'package:package_config/src/packages_impl.dart';
 import 'package:path/path.dart' as path;
 import 'package:unittest/unittest.dart';
 
 import '../../generated/test_support.dart';
 import '../../reflective_tests.dart';
+import '../../source/embedder_test.dart';
 import '../../utils.dart';
 import 'mock_sdk.dart';
 
 main() {
   initializeTestEnvironment();
   runReflectiveTests(ContextBuilderTest_WithDisk);
   runReflectiveTests(ContextBuilderTest_WithoutDisk);
+  runReflectiveTests(EmbedderYamlLocatorTest);
 }
 
 @reflectiveTest
 class ContextBuilderTest_WithDisk extends EngineTestCase {
   /**
    * The resource provider to be used by tests.
    */
   PhysicalResourceProvider resourceProvider;
 
   /**
@@ skipping 646 matching lines @@
     expect(actual.lint, expected.lint);
     expect(actual.preserveComments, expected.preserveComments);
     expect(actual.strongMode, expected.strongMode);
     expect(actual.strongModeHints, expected.strongModeHints);
     expect(actual.implicitCasts, expected.implicitCasts);
     expect(actual.implicitDynamic, expected.implicitDynamic);
     expect(actual.trackCacheDependencies, expected.trackCacheDependencies);
     expect(actual.finerGrainedInvalidation, expected.finerGrainedInvalidation);
   }
 }
+
+@reflectiveTest
+class EmbedderYamlLocatorTest extends EmbedderRelatedTest {
+  void test_empty() {
+    EmbedderYamlLocator locator = new EmbedderYamlLocator({
+      'fox': [pathTranslator.getResource('/empty')]
+    });
+    expect(locator.embedderYamls, hasLength(0));
+  }
+
+  void test_invalid() {
+    EmbedderYamlLocator locator = new EmbedderYamlLocator(null);
+    locator.addEmbedderYaml(null, r'''{{{,{{}}},}}''');
+    expect(locator.embedderYamls, hasLength(0));
+  }
+
+  void test_valid() {
+    EmbedderYamlLocator locator = new EmbedderYamlLocator({
+      'fox': [pathTranslator.getResource('/tmp')]
+    });
+    expect(locator.embedderYamls, hasLength(1));
+  }
+}