Add Folder.getChildAssumingFile().

pkg/analyzer/test/file_system/physical_resource_provider_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 analyzer.test.file_system.physical_resource_provider_test;
 
 import 'dart:async';
 import 'dart:core' hide Resource;
 import 'dart:io' as io;
 
@@ skipping 236 matching lines @@
     expect(child.exists, isTrue);
   }
 
   void test_getChild_folder() {
     new io.Directory(join(path, 'myFolder')).createSync();
     var child = folder.getChild('myFolder');
     expect(child, _isFolder);
     expect(child.exists, isTrue);
   }
 
+  void test_getChildAssumingFile_doesNotExist() {
+    File child = folder.getChildAssumingFile('no-such-resource');
+    expect(child, isNotNull);
+    expect(child.exists, isFalse);
+  }
+
+  void test_getChildAssumingFile_file() {
+    new io.File(join(path, 'myFile')).createSync();
+    File child = folder.getChildAssumingFile('myFile');
+    expect(child, isNotNull);
+    expect(child.exists, isTrue);
+  }
+
+  void test_getChildAssumingFile_folder() {
+    new io.Directory(join(path, 'myFolder')).createSync();
+    File child = folder.getChildAssumingFile('myFolder');
+    expect(child, isNotNull);
+    expect(child.exists, isFalse);
+  }
+
   void test_getChildAssumingFolder_doesNotExist() {
     Folder child = folder.getChildAssumingFolder('no-such-resource');
     expect(child, isNotNull);
     expect(child.exists, isFalse);
   }
 
   void test_getChildAssumingFolder_file() {
     new io.File(join(path, 'myFile')).createSync();
     Folder child = folder.getChildAssumingFolder('myFile');
     expect(child, isNotNull);
@@ skipping 239 matching lines @@
 
   setUp() {
     tempDirectory = io.Directory.systemTemp.createTempSync('test_resource');
     tempPath = tempDirectory.absolute.path;
   }
 
   tearDown() {
     tempDirectory.deleteSync(recursive: true);
   }
 }