Update worker mode to use the bazel protos directly instead of json

pkg/analyzer_cli/test/message_grouper_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_cli/src/message_grouper.dart';
+import 'package:unittest/unittest.dart';
+
+import 'utils.dart';
+
+main() {
+  MessageGrouper messageGrouper;
+  TestStdinStream stdinStream;
+
+  setUp(() {
+    stdinStream = new TestStdinStream();
+    messageGrouper = new MessageGrouper(stdinStream);
+  });
+
+  group('message_grouper', () {
+    /// Check that if the message grouper produces the [expectedOutput] in
+    /// response to the corresponding [input].
+    void check(List<int> input, List<List<int>> expectedOutput) {
+      stdinStream.addInputBytes(input);
+      for (var chunk in expectedOutput) {
+        expect(messageGrouper.next, equals(chunk));
+      }
+    }
+
+    /// Make a simple message having the given [length]
+    List<int> makeMessage(int length) {
+      var result = <int>[];
+      for (int i = 0; i < length; i++) {
+        result.add(i & 0xff);
+      }
+      return result;
+    }
+
+    test('Empty message', () {
+      check([0], [[]]);
+    });
+
+    test('Short message', () {
+      check([
+        5,
+        10,
+        20,
+        30,
+        40,
+        50
+      ], [
+        [10, 20, 30, 40, 50]
+      ]);
+    });
+
+    test('Message with 2-byte length', () {
+      var len = 0x155;
+      var msg = makeMessage(len);
+      var encodedLen = [0xd5, 0x02];
+      check([]..addAll(encodedLen)..addAll(msg), [msg]);
+    });
+
+    test('Message with 3-byte length', () {
+      var len = 0x4103;
+      var msg = makeMessage(len);
+      var encodedLen = [0x83, 0x82, 0x01];
+      check([]..addAll(encodedLen)..addAll(msg), [msg]);
+    });
+
+    test('Multiple messages', () {
+      check([
+        2,
+        10,
+        20,
+        2,
+        30,
+        40
+      ], [
+        [10, 20],
+        [30, 40]
+      ]);
+    });
+
+    test('Empty message at start', () {
+      check([
+        0,
+        2,
+        10,
+        20
+      ], [
+        [],
+        [10, 20]
+      ]);
+    });
+
+    test('Empty message at end', () {
+      check([
+        2,
+        10,
+        20,
+        0
+      ], [
+        [10, 20],
+        []
+      ]);
+    });
+
+    test('Empty message in the middle', () {
+      check([
+        2,
+        10,
+        20,
+        0,
+        2,
+        30,
+        40
+      ], [
+        [10, 20],
+        [],
+        [30, 40]
+      ]);
+    });
+  });
+}