Always split collections and argument lists with trailing commas.

test/io_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 dart_style.test.io;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:dart_style/src/io.dart';
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import 'package:dart_style/src/formatter_options.dart';
 
 import 'utils.dart';
 
 void main() {
   setUpTestSuite();
 
   var overwriteOptions = new FormatterOptions(OutputReporter.overwrite);
 
   var followOptions =
       new FormatterOptions(OutputReporter.overwrite, followLinks: true);
 
   test('handles directory ending in ".dart"', () {
-    d.dir('code.dart', [d.file('a.dart', unformattedSource),]).create();
+    d.dir('code.dart', [
+      d.file('a.dart', unformattedSource),
+    ]).create();
 
     schedule(() {
       var dir = new Directory(d.defaultRoot);
       processDirectory(overwriteOptions, dir);
     }, 'Run formatter.');
 
     d.dir('code.dart', [d.file('a.dart', formattedSource)]).validate();
   });
 
   test("doesn't touch unchanged files", () {
@@ skipping 51 matching lines @@
 
     schedule(() {
       var dir = new Directory(p.join(d.defaultRoot, '.code'));
       processDirectory(overwriteOptions, dir);
     }, 'Run formatter.');
 
     d.dir('.code', [d.file('a.dart', formattedSource)]).validate();
   });
 
   test("doesn't follow directory symlinks by default", () {
-    d.dir('code', [d.file('a.dart', unformattedSource),]).create();
+    d.dir('code', [
+      d.file('a.dart', unformattedSource),
+    ]).create();
 
-    d.dir('target_dir', [d.file('b.dart', unformattedSource),]).create();
+    d.dir('target_dir', [
+      d.file('b.dart', unformattedSource),
+    ]).create();
 
     schedule(() {
       // Create a link to the target directory in the code directory.
       new Link(p.join(d.defaultRoot, 'code', 'linked_dir'))
           .createSync(p.join(d.defaultRoot, 'target_dir'));
     }, 'Create symlinks.');
 
     schedule(() {
       var dir = new Directory(p.join(d.defaultRoot, 'code'));
       processDirectory(overwriteOptions, dir);
     }, 'Run formatter.');
 
     d.dir('code', [
       d.file('a.dart', formattedSource),
-      d.dir('linked_dir', [d.file('b.dart', unformattedSource),])
+      d.dir('linked_dir', [
+        d.file('b.dart', unformattedSource),
+      ])
     ]).validate();
   });
 
   test("follows directory symlinks when 'followLinks' is true", () {
-    d.dir('code', [d.file('a.dart', unformattedSource),]).create();
+    d.dir('code', [
+      d.file('a.dart', unformattedSource),
+    ]).create();
 
-    d.dir('target_dir', [d.file('b.dart', unformattedSource),]).create();
+    d.dir('target_dir', [
+      d.file('b.dart', unformattedSource),
+    ]).create();
 
     schedule(() {
       // Create a link to the target directory in the code directory.
       new Link(p.join(d.defaultRoot, 'code', 'linked_dir'))
           .createSync(p.join(d.defaultRoot, 'target_dir'));
     });
 
     schedule(() {
       var dir = new Directory(p.join(d.defaultRoot, 'code'));
       processDirectory(followOptions, dir);
     }, 'running formatter');
 
     d.dir('code', [
       d.file('a.dart', formattedSource),
-      d.dir('linked_dir', [d.file('b.dart', formattedSource),])
+      d.dir('linked_dir', [
+        d.file('b.dart', formattedSource),
+      ])
     ]).validate();
   });
 
   if (!Platform.isWindows) {
     test("doesn't follow file symlinks by default", () {
       d.dir('code').create();
       d.file('target_file.dart', unformattedSource).create();
 
       schedule(() {
         // Create a link to the target file in the code directory.
         new Link(p.join(d.defaultRoot, 'code', 'linked_file.dart'))
             .createSync(p.join(d.defaultRoot, 'target_file.dart'));
       }, 'Create symlinks.');
 
       schedule(() {
         var dir = new Directory(p.join(d.defaultRoot, 'code'));
         processDirectory(overwriteOptions, dir);
       }, 'Run formatter.');
 
-      d.dir(
-          'code', [d.file('linked_file.dart', unformattedSource),]).validate();
+      d.dir('code', [
+        d.file('linked_file.dart', unformattedSource),
+      ]).validate();
     });
 
     test("follows file symlinks when 'followLinks' is true", () {
       d.dir('code').create();
       d.file('target_file.dart', unformattedSource).create();
 
       schedule(() {
         // Create a link to the target file in the code directory.
         new Link(p.join(d.defaultRoot, 'code', 'linked_file.dart'))
             .createSync(p.join(d.defaultRoot, 'target_file.dart'));
       });
 
       schedule(() {
         var dir = new Directory(p.join(d.defaultRoot, 'code'));
         processDirectory(followOptions, dir);
       }, 'running formatter');
 
-      d.dir('code', [d.file('linked_file.dart', formattedSource),]).validate();
+      d.dir('code', [
+        d.file('linked_file.dart', formattedSource),
+      ]).validate();
     });
   }
 }