add sendRequest to VMIsolateRef

test/isolate_test.dart

Index: test/isolate_test.dart
diff --git a/test/isolate_test.dart b/test/isolate_test.dart
index b08bdd9158db4d4326739dbc8fc1e97da022cfe2..545c45ff0e9bc39b4034478892c08477aab86694 100644
--- a/test/isolate_test.dart
+++ b/test/isolate_test.dart
@@ -375,6 +375,49 @@ void main() {
       expect(breakpoint.number, equals(1));
     });
   });
+
+  group("invokeExtension", () {
+    test("enforces ext. prefix", () async {
+      var client = await runAndConnect();
+      var isolate = await (await client.getVM()).isolates.first.loadRunnable();
+      expect(() => isolate.invokeExtension('noprefix'), throwsArgumentError);
+    });
+
+    test("forwards to scope", () async {
+      var client = await runAndConnect(main: r"""
+        registerExtension('ext.ping', (_, __) async {
+          return new ServiceExtensionResponse.result('{"type": "pong"}');
+        });
+      """);
+
+      var isolate = await (await client.getVM()).isolates.first.loadRunnable();
+      Map response = await isolate.invokeExtension('ext.ping');
+      expect(response, {'type': 'pong'});
+    });
+
+    test("passes parameters", () async {
+      var client = await runAndConnect(main: r"""
+        registerExtension('ext.params', (_, params) async {
+          return new ServiceExtensionResponse.result('''{
+            "type": "params",
+            "foo": "${params['foo']}",
+            "baz": "${params['baz']}"
+          }''');
+        });
+      """);
+
+      var isolate = await (await client.getVM()).isolates.first.loadRunnable();
+      Map response = await isolate.invokeExtension('ext.params', {

[nweiz, 2016/02/10 22:17:11]

Nit: "var response" (also above).

[yjbanov, 2016/02/10 23:06:37]

Ugh, Flutter code style is getting into me. Done.

+        'foo': 'bar',
+        'baz': 1,  // VM service string-encodes parameter values
+      });
+      expect(response, {
+        'type': 'params',
+        'foo': 'bar',
+        'baz': '1',
+      });
+    });
+  });
 }
 
 /// Starts a client with two unpaused empty isolates.