Issue 18926. Rename refactoring for labels.

pkg/analysis_server/test/services/refactoring/rename_label_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.rename_label;
+
+import 'package:analysis_server/src/protocol.dart';
+import 'package:unittest/unittest.dart';
+
+import '../../reflective_tests.dart';
+import 'abstract_rename.dart';
+
+
+main() {
+  groupSep = ' | ';
+  runReflectiveTests(RenameLabelTest);
+}
+
+
+@ReflectiveTestCase()
+class RenameLabelTest extends RenameRefactoringTest {
+  test_checkNewName_LocalVariableElement() {
+    indexTestUnit('''
+main() {
+test:
+  while (true) {
+    break test;
+  }
+}
+''');
+    createRenameRefactoringAtString('test:');
+    // null
+    refactoring.newName = null;
+    assertRefactoringStatus(
+        refactoring.checkNewName(),
+        RefactoringProblemSeverity.FATAL,
+        expectedMessage: "Label name must not be null.");
+    // empty
+    refactoring.newName = '';
+    assertRefactoringStatus(
+        refactoring.checkNewName(),
+        RefactoringProblemSeverity.FATAL,
+        expectedMessage: "Label name must not be empty.");
+    // OK
+    refactoring.newName = 'newName';
+    assertRefactoringStatusOK(refactoring.checkNewName());
+  }
+
+  test_createChange() {
+    indexTestUnit('''
+main() {
+test:
+  while (true) {
+    break test;
+  }
+}
+''');
+    // configure refactoring
+    createRenameRefactoringAtString('test:');
+    expect(refactoring.refactoringName, 'Rename Label');
+    expect(refactoring.elementKindName, 'label');
+    refactoring.newName = 'newName';
+    // validate change
+    return assertSuccessfulRefactoring('''
+main() {
+newName:
+  while (true) {
+    break newName;
+  }
+}
+''');
+  }
+
+  test_oldName() {
+    indexTestUnit('''
+main() {
+test:
+  while (true) {
+    break test;
+  }
+}
+''');
+    // configure refactoring
+    createRenameRefactoringAtString('test:');
+    // old name
+    expect(refactoring.oldName, 'test');
+  }
+}