Add a mid-sized integration test for the Dart Embedding Api which

runtime/vm/port_test.cc

Index: runtime/vm/port_test.cc
===================================================================
--- runtime/vm/port_test.cc	(revision 1518)
+++ runtime/vm/port_test.cc	(working copy)
@@ -11,6 +11,13 @@
 namespace dart {
 
 
+// Intercept the create port callback and remember which port was created.
+static Dart_Port saved_create_port = 0;
+static void MyCreatePortCallback(Dart_Isolate dart_isolate,
+                                 Dart_Port port) {
+  saved_create_port = port;
+}
+
 // Intercept the post message callback and just store a copy of the message.
 static const int kMaxSavedMsg = 80;
 static char saved_msg[kMaxSavedMsg];
@@ -27,16 +34,18 @@
 
 
 // Intercept the close port callback and remember which port was closed.
-static Dart_Port saved_port = 0;
+static Dart_Port saved_close_port = 0;
 static void MyClosePortCallback(Dart_Isolate dart_isolate,
                                 Dart_Port port) {
-  saved_port = port;
+  saved_close_port = port;
 }
 
 
 static void InitPortMapTest() {
-  Dart_SetMessageCallbacks(&MyPostMessageCallback, &MyClosePortCallback);
-  saved_port = 0;
+  Dart_SetMessageCallbacks(
+      &MyCreatePortCallback, &MyPostMessageCallback, &MyClosePortCallback);
+  saved_create_port = 0;
+  saved_close_port = 0;
   saved_msg[0] = '\0';
 }
 
@@ -47,11 +56,14 @@
   EXPECT_NE(0, port);
   EXPECT(PortMap::IsActivePort(port));
 
+  // Embedder was notified of port creation.
+  EXPECT_EQ(port, saved_create_port);
+
   PortMap::ClosePort(port);
   EXPECT(!PortMap::IsActivePort(port));
 
   // Embedder was notified of port closure.
-  EXPECT_EQ(port, saved_port);
+  EXPECT_EQ(port, saved_close_port);
 }
 
 
@@ -68,12 +80,12 @@
   PortMap::ClosePort(port1);
   EXPECT(!PortMap::IsActivePort(port1));
   EXPECT(PortMap::IsActivePort(port2));
-  EXPECT_EQ(port1, saved_port);
+  EXPECT_EQ(port1, saved_close_port);
 
   PortMap::ClosePort(port2);
   EXPECT(!PortMap::IsActivePort(port1));
   EXPECT(!PortMap::IsActivePort(port2));
-  EXPECT_EQ(port2, saved_port);
+  EXPECT_EQ(port2, saved_close_port);
 }
 
 
@@ -90,7 +102,7 @@
   EXPECT(!PortMap::IsActivePort(port2));
 
   // Embedder is notified to close all ports as well.
-  EXPECT_EQ(kCloseAllPorts, saved_port);
+  EXPECT_EQ(kCloseAllPorts, saved_close_port);
 }