Fix tests with 'part' without 'library'.

pkg/analyzer/test/generated/compile_time_error_code_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 engine.compile_time_error_code_test;
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:analyzer/src/generated/source_io.dart';
@@ skipping 3271 matching lines @@
     assertErrors(source, [CompileTimeErrorCode.INVALID_URI]);
   }
 
   void test_invalidUri_import() {
     Source source = addSource("import 'ht:';");
     computeLibrarySourceErrors(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_URI]);
   }
 
   void test_invalidUri_part() {
-    Source source = addSource("part 'ht:';");
+    Source source = addSource(r'''
+library lib;
+part 'ht:';''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [CompileTimeErrorCode.INVALID_URI]);
   }
 
   void test_isInConstInstanceCreation_restored() {
     // If ErrorVerifier._isInConstInstanceCreation is not properly restored on
     // exit from visitInstanceCreationExpression, the error at (1) will be
     // treated as a warning rather than an error.
     Source source = addSource(r'''
 class Foo<T extends num> {
@@ skipping 2494 matching lines @@
     assertErrors(source, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
   }
 
   void test_uriDoesNotExist_import() {
     Source source = addSource("import 'unknown.dart';");
     computeLibrarySourceErrors(source);
     assertErrors(source, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
   }
 
   void test_uriDoesNotExist_part() {
-    Source source = addSource("part 'unknown.dart';");
+    Source source = addSource(r'''
+library lib;
+part 'unknown.dart';''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [CompileTimeErrorCode.URI_DOES_NOT_EXIST]);
   }
 
   void test_uriWithInterpolation_constant() {
     Source source = addSource("import 'stuff_\$platform.dart';");
     computeLibrarySourceErrors(source);
     assertErrors(source, [
       CompileTimeErrorCode.URI_WITH_INTERPOLATION,
       StaticWarningCode.UNDEFINED_IDENTIFIER
@@ skipping 224 matching lines @@
         source, [CompileTimeErrorCode.WRONG_NUMBER_OF_PARAMETERS_FOR_OPERATOR]);
     verify([source]);
     reset();
   }
 
   void _check_wrongNumberOfParametersForOperator1(String name) {
     _check_wrongNumberOfParametersForOperator(name, "");
     _check_wrongNumberOfParametersForOperator(name, "a, b");
   }
 }