Add Resource.delete() method.

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 32 matching lines @@
   }
 
   void test_createSource() {
     new io.File(path).writeAsStringSync('contents');
     Source source = file.createSource();
     expect(source.uriKind, UriKind.FILE_URI);
     expect(source.exists(), isTrue);
     expect(source.contents.data, 'contents');
   }
 
+  void test_delete() {
+    new io.File(path).writeAsStringSync('contents');
+    expect(file.exists, isTrue);
+    // delete
+    file.delete();
+    expect(file.exists, isFalse);
+  }
+
   void test_equals_differentPaths() {
     String path2 = join(tempPath, 'file2.txt');
     File file2 = PhysicalResourceProvider.INSTANCE.getResource(path2);
     expect(file == file2, isFalse);
   }
 
   void test_equals_samePath() {
     new io.File(path).writeAsStringSync('contents');
     File file2 = PhysicalResourceProvider.INSTANCE.getResource(path);
     expect(file == file2, isTrue);
@@ skipping 152 matching lines @@
         equals(join(path2, 'baz')));
   }
 
   void test_contains() {
     expect(folder.contains(join(path, 'aaa.txt')), isTrue);
     expect(folder.contains(join(path, 'aaa', 'bbb.txt')), isTrue);
     expect(folder.contains(join(tempPath, 'baz.txt')), isFalse);
     expect(folder.contains(path), isFalse);
   }
 
+  void test_delete() {
+    new io.File(join(path, 'myFile')).createSync();
+    var child = folder.getChild('myFile');
+    expect(child, _isFile);
+    expect(child.exists, isTrue);
+    // delete "folder"
+    folder.delete();
+    expect(child.exists, isFalse);
+  }
+
   void test_equals_differentPaths() {
     String path2 = join(tempPath, 'folder2');
     new io.Directory(path2).createSync();
     Folder folder2 = PhysicalResourceProvider.INSTANCE.getResource(path2);
     expect(folder == folder2, isFalse);
   }
 
   void test_equals_samePath() {
     Folder folder2 = PhysicalResourceProvider.INSTANCE.getResource(path);
     expect(folder == folder2, isTrue);
@@ skipping 291 matching lines @@
 
   setUp() {
     tempDirectory = io.Directory.systemTemp.createTempSync('test_resource');
     tempPath = tempDirectory.absolute.path;
   }
 
   tearDown() {
     tempDirectory.deleteSync(recursive: true);
   }
 }