Start trying to compile platform from unpatched sources.

pkg/front_end/test/fasta/compile_platform_test.dart

Index: pkg/front_end/test/fasta/compile_platform_test.dart
diff --git a/pkg/front_end/test/fasta/compile_platform_test.dart b/pkg/front_end/test/fasta/compile_platform_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3d94d7cfdc3cc788c98ec5ac5fb8eeb5d4c6093b
--- /dev/null
+++ b/pkg/front_end/test/fasta/compile_platform_test.dart
@@ -0,0 +1,61 @@
+// Copyright (c) 2017, 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.md file.
+
+library fasta.test.compile_platform_test;
+
+import 'dart:io';
+
+import 'package:async_helper/async_helper.dart';
+
+import 'package:expect/expect.dart';
+
+import '../../tool/_fasta/compile_platform.dart' show compilePlatform;
+
+main(List<String> arguments) async {
+  await asyncTest(() async {
+    await withTemporyDirectory("compile_platform_test_", (Uri tmp) async {
+      String patchedSdk = Uri.base
+          .resolveUri(new Uri.file(Platform.resolvedExecutable))
+          .resolve("patched_sdk")
+          .toFilePath();
+      // This first invocation should succeed.
+      await compilePlatform(<String>[
+        "-v",
+        patchedSdk,
+        tmp.resolve("platform.dill").toFilePath(),
+        tmp.resolve("platform-outline.dill").toFilePath(),
+      ]);
+      print("Successfully compiled $patchedSdk.\n\n");
+
+      try {
+        // This invocation is expected to throw an exception for now. Patching
+        // isn't fully implemented yet.
+        //
+        // TODO(ahe): When this stops crashing, use Process to invoke the tool
+        // instead of importing its main entry point.
+        await compilePlatform(<String>[
+          "-v",
+          "sdk/",
+          tmp.resolve("platform.dill").toFilePath(),
+          tmp.resolve("platform-outline.dill").toFilePath(),
+        ]);
+      } on String catch (e) {
+        Expect.isTrue(
+            e.startsWith("A member with disambiguated name '_withType' "));
+        print("Failed as expected: $e");
+        return;
+      }
+      Expect.fail("Test didn't throw expected exception.");
+    });
+  });
+}
+
+withTemporyDirectory(String prefix, Future f(Uri tmp)) async {
+  Directory tmp = await Directory.systemTemp.createTemp(prefix);
+  try {
+    await f(tmp.uri);
+  } finally {
+    await tmp.delete(recursive: true);
+  }
+}