Finish 'Extract Local' refactoring.

pkg/analysis_server/test/services/refactoring/extract_local_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 test.services.refactoring.extract_local;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/correction/change.dart';
 import 'package:analysis_server/src/services/correction/status.dart';
@@ skipping 451 matching lines @@
     _createRefactoringForString('2 + 3 ');
     // apply refactoring
     return _assertSuccessfulRefactoring('''
 main() {
   var res = 2 + 3 ;
   int a = 1 + res+ 4;
 }
 ''');
   }
 
+  test_guessNames_fragmentExpression() {
+    indexTestUnit('''
+main() {
+  var a = 111 + 222 + 333 + 444;
+}
+''');
+    _createRefactoringForString('222 + 333');
+    // check guesses
+    return refactoring.checkInitialConditions().then((_) {
+      expect(refactoring.names, isEmpty);
+    });
+  }
+
+  test_guessNames_singleExpression() {
+    indexTestUnit('''
+class TreeItem {}
+TreeItem getSelectedItem() => null;
+process(my) {}
+main() {
+  process(getSelectedItem()); // marker
+}
+''');
+    _createRefactoringWithSuffix('getSelectedItem()', '); // marker');
+    // check guesses
+    return refactoring.checkInitialConditions().then((_) {
+      expect(
+          refactoring.names,
+          unorderedEquals(['selectedItem', 'item', 'my', 'treeItem']));
+    });
+  }
+
+  test_guessNames_stringPart() {
+    indexTestUnit('''
+main() {
+  var s = 'Hello Bob... welcome to Dart!';
+}
+''');
+    _createRefactoringForString('Hello Bob');
+    // check guesses
+    return refactoring.checkInitialConditions().then((_) {
+      expect(refactoring.names, unorderedEquals(['helloBob', 'bob']));
+    });
+  }
+
   test_occurences_disableOccurences() {
     indexTestUnit('''
 int foo() => 42;
 main() {
   int a = 1 + foo();
   int b = 2 + foo(); // marker
 }
 ''');
     _createRefactoringWithSuffix('foo()', '; // marker');
     refactoring.extractAll = false;
@@ skipping 128 matching lines @@
 int foo(String s) => 42;
 main() {
   var res = foo('has space');
   int a = 1 + res;
   int b = 2 + res; // marker
 }
 ''');
   }
 
   test_offsets_lengths() {
-    // TODO(scheglov) implement and test
+    indexTestUnit('''
+int foo() => 42;
+main() {
+  int a = 1 + foo(); // marker
+  int b = 2 + foo( );
+}
+''');
+    _createRefactoringWithSuffix('foo()', '; // marker');
+    // apply refactoring
+    return refactoring.checkInitialConditions().then((_) {
+      expect(
+          refactoring.offsets,
+          unorderedEquals([findOffset('foo();'), findOffset('foo( );')]));
+      expect(refactoring.lengths, unorderedEquals([5, 6]));
+    });
   }
 
   test_singleExpression() {
     indexTestUnit('''
 main() {
   int a = 1 + 2;
 }
 ''');
     _createRefactoringForString('1 + 2');
     // apply refactoring
@@ skipping 208 matching lines @@
     int length = search.length;
     _createRefactoring(offset, length);
   }
 
   void _createRefactoringWithSuffix(String selectionSearch, String suffix) {
     int offset = findOffset(selectionSearch + suffix);
     int length = selectionSearch.length;
     _createRefactoring(offset, length);
   }
 }