Issue 18926. Rename refactoring for labels.

pkg/analysis_server/test/services/refactoring/naming_conventions_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.naming_conventions;
 
 import 'package:analysis_server/src/protocol.dart' show
     RefactoringProblemSeverity;
 import 'package:analysis_server/src/services/refactoring/naming_conventions.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
-import '../../reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
+import '../../reflective_tests.dart';
 import 'abstract_refactoring.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(NamingConventionsTest);
 }
 
 
 @ReflectiveTestCase()
@@ skipping 432 matching lines @@
         expectedMessage: "Import prefix name must not be null.");
   }
 
   void test_validateImportPrefixName_trailingBlanks() {
     assertRefactoringStatus(
         validateImportPrefixName("newName "),
         RefactoringProblemSeverity.ERROR,
         expectedMessage: "Import prefix name must not start or end with a blank.");
   }
 
+  void test_validateLabelName_OK() {
+    assertRefactoringStatusOK(validateLabelName("newName"));
+  }
+
+  void test_validateLabelName_OK_leadingDollar() {
+    assertRefactoringStatusOK(validateLabelName("\$newName"));
+  }
+
+  void test_validateLabelName_OK_leadingUnderscore() {
+    assertRefactoringStatusOK(validateLabelName("_newName"));
+  }
+
+  void test_validateLabelName_OK_middleUnderscore() {
+    assertRefactoringStatusOK(validateLabelName("new_name"));
+  }
+
+  void test_validateLabelName_doesNotStartWithLowerCase() {
+    assertRefactoringStatus(
+        validateLabelName("NewName"),
+        RefactoringProblemSeverity.WARNING,
+        expectedMessage: "Label name should start with a lowercase letter.");
+  }
+
+  void test_validateLabelName_empty() {
+    assertRefactoringStatus(
+        validateLabelName(""),
+        RefactoringProblemSeverity.FATAL,
+        expectedMessage: "Label name must not be empty.");
+  }
+
+  void test_validateLabelName_leadingBlanks() {
+    assertRefactoringStatus(
+        validateLabelName(" newName"),
+        RefactoringProblemSeverity.ERROR,
+        expectedMessage: "Label name must not start or end with a blank.");
+  }
+
+  void test_validateLabelName_notIdentifierMiddle() {
+    assertRefactoringStatus(
+        validateLabelName("new-Name"),
+        RefactoringProblemSeverity.ERROR,
+        expectedMessage: "Label name must not contain '-'.");
+  }
+
+  void test_validateLabelName_notIdentifierStart() {
+    assertRefactoringStatus(
+        validateLabelName("2newName"),
+        RefactoringProblemSeverity.ERROR,
+        expectedMessage:
+            "Label name must begin with a lowercase letter or underscore.");
+  }
+
+  void test_validateLabelName_null() {
+    assertRefactoringStatus(
+        validateLabelName(null),
+        RefactoringProblemSeverity.FATAL,
+        expectedMessage: "Label name must not be null.");
+  }
+
+  void test_validateLabelName_trailingBlanks() {
+    assertRefactoringStatus(
+        validateLabelName("newName "),
+        RefactoringProblemSeverity.ERROR,
+        expectedMessage: "Label name must not start or end with a blank.");
+  }
+
   void test_validateLibraryName_OK_oneIdentifier() {
     assertRefactoringStatusOK(validateLibraryName("name"));
   }
 
   void test_validateLibraryName_OK_severalIdentifiers() {
     assertRefactoringStatusOK(validateLibraryName("my.library.name"));
   }
 
   void test_validateLibraryName_blank() {
     assertRefactoringStatus(
@@ skipping 244 matching lines @@
         expectedMessage: "Variable name must not be null.");
   }
 
   void test_validateVariableName_trailingBlanks() {
     assertRefactoringStatus(
         validateVariableName("newName "),
         RefactoringProblemSeverity.ERROR,
         expectedMessage: "Variable name must not start or end with a blank.");
   }
 }