Ensure formatted CUs end with a newline (dartbug.com/13188).

pkg/analyzer_experimental/test/services/formatter_test.dart

 // Copyright (c) 2013, 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.
 
 import 'package:unittest/unittest.dart';
 
 import 'package:analyzer_experimental/src/generated/scanner.dart';
 import 'package:analyzer_experimental/src/services/formatter_impl.dart';
 import 'package:analyzer_experimental/src/services/writer.dart';
 
@@ skipping 28 matching lines @@
           'class A {\n'
           '}\n'
         );
     });
 
     test('CU (3)', () {
       expectCUFormatsTo(
           'class A {\n'
           '  }',
           'class A {\n'
-          '}'
+          '}\n'
         );
     });
 
     test('CU (4)', () {
       expectCUFormatsTo(
           ' class A {\n'
           '}\n',
           'class A {\n'
           '}\n'
         );
     });
 
     test('CU (5)', () {
       expectCUFormatsTo(
           'class A  { int meaningOfLife() => 42; }',
           'class A {\n'
           '  int meaningOfLife() => 42;\n'
-          '}'
+          '}\n'
       );
     });
 
     test('CU - EOL comments', () {
       expectCUFormatsTo(
           '//comment one\n\n'
           '//comment two\n\n',
           '//comment one\n\n'
           '//comment two\n\n'
       );
@@ skipping 77 matching lines @@
           '}\n',
           'import "dart:io";\n\n'
           'import "package:unittest/unittest.dart";\n'
           'foo() {\n'
           '}\n'
       );
       expectCUFormatsTo(
           'library a; class B { }',
           'library a;\n'
           'class B {\n'
-          '}'
+          '}\n'
       );
     });
 
     test('CU - method invocations', () {
       expectCUFormatsTo(
           'class A {\n'
           '  foo() {\n'
           '    bar();\n'
           '    for (int i = 0; i < 42; i++) {\n'
           '      baz();\n'
@@ skipping 13 matching lines @@
 
     test('CU w/class decl comment', () {
       expectCUFormatsTo(
           'import "foo";\n\n'
           '//Killer class\n'
           'class A {\n'
           '}',
           'import "foo";\n\n'
           '//Killer class\n'
           'class A {\n'
-          '}'
+          '}\n'
         );
     });
 
     test('CU (method body)', () {
       expectCUFormatsTo(
           'class A {\n'
           '  foo(path) {\n'
           '    var buffer = new StringBuffer();\n'
           '    var file = new File(path);\n'
           '    return file;\n'
@@ skipping 211 matching lines @@
           '// Comment 2\n'
           '\n'
           '/* Comment 3 */',
           'library foo;\n'
           '\n'
           '\n'
           '/* Comment 1 */\n'
           '\n'
           '// Comment 2\n'
           '\n'
-          '/* Comment 3 */'
+          '/* Comment 3 */\n'
         );
     });
 
     test('CU - comments (EOF)', () {
       expectCUFormatsTo(
           'library foo; //zamm',
           'library foo; //zamm\n' //<-- note extra NEWLINE
         );
     });
 
@@ skipping 30 matching lines @@
           'var x;   //x\n',
           'var x; //x\n'
       );
     });
 
     test('CU - comments (4)', () {
       expectCUFormatsTo(
           'class X { //X!\n'
           '}',
           'class X { //X!\n'
-          '}'
+          '}\n'
       );
     });
 
     test('CU - comments (5)', () {
       expectCUFormatsTo(
           '//comment one\n\n'
           '//comment two\n\n',
           '//comment one\n\n'
           '//comment two\n\n'
       );
@@ skipping 35 matching lines @@
           'class A {\n'
           '}\n'
           '\n'
           '/// ... and\n'
           '\n'
           '/// Dangling ones too\n'
           'int x;\n'
         );
     });
 
-
+    test('CU - EOF nl', () {
+      expectCUFormatsTo(
+          'var x = 1;',
+          'var x = 1;\n'
+      );
+    });
+    
     test('CU - constructor', () {
       expectCUFormatsTo(
           'class A {\n'
           '  const _a;\n'
           '  A();\n'
           '  int a() => _a;\n'
           '}\n',
           'class A {\n'
           '  const _a;\n'
           '  A();\n'
@@ skipping 419 matching lines @@
     new TokenStreamComparator(null, t1, t2).verifyEquals();
 
 expectStreamsNotEqual(Token t1, Token t2) =>
     expect(() => new TokenStreamComparator(null, t1, t2).verifyEquals(),
     throwsA(new isInstanceOf<FormatterException>()));
 
 expectCUFormatsTo(src, expected) => expect(formatCU(src), equals(expected));
 
 expectStmtFormatsTo(src, expected) => expect(formatStatement(src),
     equals(expected));