Add an analysis option to disable cache flushing.

pkg/analyzer_cli/test/options_test.dart

 // Copyright (c) 2015, 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 analyzer_cli.test.options;
 
 import 'dart:io';
 
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:analyzer_cli/src/options.dart';
 import 'package:args/args.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 main() {
   group('CommandLineOptions', () {
     group('parse', () {
       test('defaults', () {
         CommandLineOptions options =
             CommandLineOptions.parse(['--dart-sdk', '.', 'foo.dart']);
         expect(options, isNotNull);
         expect(options.buildMode, isFalse);
         expect(options.buildAnalysisOutput, isNull);
         expect(options.buildSummaryInputs, isEmpty);
         expect(options.buildSummaryOnly, isFalse);
         expect(options.buildSummaryOutput, isNull);
         expect(options.buildSummaryOutputSemantic, isNull);
         expect(options.buildSuppressExitCode, isFalse);
         expect(options.dartSdkPath, isNotNull);
+        expect(options.disableCacheFlushing, isFalse);
         expect(options.disableHints, isFalse);
         expect(options.lints, isFalse);
         expect(options.displayVersion, isFalse);
         expect(options.enableStrictCallChecks, isFalse);
         expect(options.enableSuperMixins, isFalse);
         expect(options.enableTypeChecks, isFalse);
         expect(options.hintsAreFatal, isFalse);
         expect(options.ignoreUnrecognizedFlags, isFalse);
         expect(options.log, isFalse);
         expect(options.machineFormat, isFalse);
@@ skipping 13 matching lines @@
         expect(options.shouldBatch, isTrue);
       });
 
       test('defined variables', () {
         CommandLineOptions options = CommandLineOptions
             .parse(['--dart-sdk', '.', '-Dfoo=bar', 'foo.dart']);
         expect(options.definedVariables['foo'], equals('bar'));
         expect(options.definedVariables['bar'], isNull);
       });
 
+      test('disable cache flushing', () {
+        CommandLineOptions options = CommandLineOptions
+            .parse(['--dart-sdk', '.', '--disable-cache-flushing', 'foo.dart']);
+        expect(options.disableCacheFlushing, isTrue);
+      });
+
       test('enable strict call checks', () {
         CommandLineOptions options = CommandLineOptions.parse(
             ['--dart-sdk', '.', '--enable-strict-call-checks', 'foo.dart']);
         expect(options.enableStrictCallChecks, isTrue);
       });
 
       test('enable super mixins', () {
         CommandLineOptions options = CommandLineOptions
             .parse(['--dart-sdk', '.', '--supermixin', 'foo.dart']);
         expect(options.enableSuperMixins, isTrue);
@@ skipping 272 matching lines @@
       'package:p/foo.dart|/path/to/p/lib/foo.dart'
     ]);
     expect(options.buildMode, isTrue);
     expect(options.buildSuppressExitCode, isTrue);
   }
 
   void _parse(List<String> args) {
     options = CommandLineOptions.parse(args);
   }
 }