Add SExpression test and share tests between dart2dart and analyzer2dart.

pkg/analyzer2dart/test/sexpr_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.
+
+/// Unittest test of the CPS ir generated by the analyzer2dart compiler.
+
+import 'mock_sdk.dart';
+import 'package:analyzer/file_system/memory_file_system.dart';
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:compiler/implementation/cps_ir/cps_ir_nodes_sexpr.dart';
+import 'package:unittest/unittest.dart';
+
+import '../lib/src/closed_world.dart';
+import '../lib/src/driver.dart';
+import '../lib/src/converted_world.dart';
+import 'output_helper.dart';
+import 'test_helper.dart';
+import 'sexpr_data.dart';
+
+main() {
+  performTests(TEST_DATA, unittester, checkResult);
+}
+
+checkResult(TestSpec result) {
+  String input = result.input.trim();
+  String expectedOutput = result.output.trim();
+  CollectingOutputProvider outputProvider = new CollectingOutputProvider();
+  MemoryResourceProvider provider = new MemoryResourceProvider();
+  DartSdk sdk = new MockSdk();
+  Driver driver = new Driver(provider, sdk, outputProvider);
+  String rootFile = '/root.dart';
+  provider.newFile(rootFile, input);
+  Source rootSource = driver.setRoot(rootFile);
+  FunctionElement entryPoint = driver.resolveEntryPoint(rootSource);
+  ClosedWorld world = driver.computeWorld(entryPoint);
+  ConvertedWorld convertedWorld = convertWorld(world);
+  String output = convertedWorld.getIr(convertedWorld.mainFunction)
+      .accept(new SExpressionStringifier());
+  expect(output, equals(expectedOutput),
+      reason: 'Input:\n$input\n'
+              'Expected:\n$expectedOutput\n'
+              'Actual:\n$output');
+}
+