Issue 27536. Quick Fix for 'Avoid using braces in interpolation when not needed'.

pkg/analysis_server/test/services/correction/fix_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.correction.fix;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
@@ skipping 5255 matching lines @@
 
   Future applyFix(FixKind kind) async {
     fix = await _assertHasFix(kind, error);
     change = fix.change;
     // apply to "file"
     List<SourceFileEdit> fileEdits = change.edits;
     expect(fileEdits, hasLength(1));
     resultCode = SourceEdit.applySequence(testCode, change.edits[0].edits);
   }
 
-  void findLint(String src, String lintCode) {
+  void findLint(String src, String lintCode, {int length: 1}) {
     int errorOffset = src.indexOf('/*LINT*/');
     resolveTestUnit(src.replaceAll('/*LINT*/', ''));
-    error = new AnalysisError(testUnit.element.source, errorOffset, 1,
+    error = new AnalysisError(testUnit.element.source, errorOffset, length,
         new LintCode(lintCode, '<ignored>'));
   }
 
   test_lint_addMissingOverride_field() async {
     String src = '''
 class abstract Test {
   int get t;
 }
 class Sub extends Test {
   int /*LINT*/t = 42;
@@ skipping 165 matching lines @@
   void t() { }
 }
 class Sub extends Test {
   // Non-doc comment.
   @override
   void t() { }
 }
 ''');
   }
 
+  test_lint_removeInterpolationBraces() async {
+    String src = r'''
+main() {
+  var v = 42;
+  print('v: /*LINT*/${ v}');
+}
+''';
+    findLint(src, LintNames.unnecessary_brace_in_string_interp, length: 4);
+    await applyFix(DartFixKind.LINT_REMOVE_INTERPOLATION_BRACES);
+    verifyResult(r'''
+main() {
+  var v = 42;
+  print('v: $v');
+}
+''');
+  }
+
   void verifyResult(String expectedResult) {
     expect(resultCode, expectedResult);
   }
 }