Split resolver_test.dart into smaller files.

pkg/analyzer/test/generated/error_suppression_test.dart

 // Copyright (c) 2016, 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:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 
 import '../reflective_tests.dart';
 import '../utils.dart';
-import 'resolver_test.dart';
+import 'resolver_test_case.dart';
 
 main() {
   initializeTestEnvironment();
   runReflectiveTests(ErrorSuppressionTest);
 }
 
 @reflectiveTest
 class ErrorSuppressionTest extends ResolverTestCase {
   void test_error_code_mismatch() {
     Source source = addSource('''
@@ skipping 121 matching lines @@
 int x = '';  //INVALID_ASSIGNMENT
 const y = x; //CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
 ''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [
       StaticTypeWarningCode.INVALID_ASSIGNMENT,
       CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE
     ]);
   }
 }