send priority instrumentation message on startup with version info

pkg/analyzer/test/instrumentation/instrumentation_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 test.instrumentation;
 
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:unittest/unittest.dart';
 
 import '../reflective_tests.dart';
@@ skipping 87 matching lines @@
     assertNormal(server, InstrumentationService.TAG_REQUEST, message);
   }
 
   void test_logResponse() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
     String message = 'responseText';
     service.logResponse(message);
     assertNormal(server, InstrumentationService.TAG_RESPONSE, message);
   }
+
+  void test_logVersion() {
+    TestInstrumentationServer server = new TestInstrumentationServer();
+    InstrumentationService service = new InstrumentationService(server);
+    service.logVersion(
+        'myUuid',
+        'someClientId',
+        'someClientVersion',
+        'aServerVersion',
+        'anSdkVersion');
+    expect(server.normalChannel.toString(), '');
+    expect(
+        server.priorityChannel.toString(),
+        endsWith(
+            ':myUuid:someClientId:someClientVersion:aServerVersion:anSdkVersion\n'));
+  }
 }
 
 @reflectiveTest
 class MulticastInstrumentationServerTest {
   TestInstrumentationServer serverA = new TestInstrumentationServer();
   TestInstrumentationServer serverB = new TestInstrumentationServer();
   MulticastInstrumentationServer server;
 
   void setUp() {
     server = new MulticastInstrumentationServer([serverA, serverB]);
@@ skipping 42 matching lines @@
   @override
   void logWithPriority(String message) {
     priorityChannel.writeln(message);
   }
 
   @override
   void shutdown() {
     // Ignored
   }
 }