Add tests for session

test/session_test.dart

@@ -0,0 +1,61 @@
+import "package:test/expect.dart";
+import "package:test/scaffolding.dart";
+import "package:wampproto/serializers.dart";
+
+import "package:xconn/exports.dart";
+import "package:xconn/src/types.dart";
+
+void main() {
+  var router = Router()..addRealm("realm1");
+
+  var serializer = JSONSerializer();
+  var clientSideBase = ClientSideLocalBaseSession(1, "realm1", "local", "local", serializer, router);
+  var serverSideBase = ServerSideLocalBaseSession(1, "realm1", "local", "local", serializer, other: clientSideBase);
+
+  router.attachClient(serverSideBase);
+
+  var session = Session(clientSideBase);
+
+  const procedureName = "io.xconn.test_procedure";
+  late Registration registration;
+  test("register a procedure", () async {
+    registration = await session.register(procedureName, (inv) {
+      print("Invocation: args=${inv.args}, kwargs=${inv.kwargs}, details=${inv.details}");
+      return Result(args: inv.args, kwargs: inv.kwargs, details: inv.details);
+    });
+
+    expect(registration, isA<Registration>());
+  });
+
+  test("call a procedure", () async {
+    var args = ["abc", 1];
+    var kwargs = {"foo": 1};
+
+    var result = await session.call(procedureName, args: args, kwargs: kwargs);
+    expect(result, isA<Result>());
+    expect(result.args, args);
+    expect(result.kwargs, kwargs);
+    expect(result.details, {});
+  });
+
+  test("unregister a procedure", () async {
+    await session.unregister(registration);
+  });
+
+  const topicName = "io.xconn.test_topic";
+  late Subscription subscription;
+  test("subscribe to a topic", () async {
+    subscription = await session.subscribe(topicName, (event) {
+      print("Event: args=${event.args}, kwargs=${event.kwargs}, details=${event.details}");
+    });
+    expect(subscription, isA<Subscription>());
+  });
+
+  test("publish to a topic", () async {
+    await session.publish(topicName, args: ["abc"], kwargs: {"one": 1}, options: {"acknowledge": true});
+  });
+
+  test("unsubscribe from a topic", () async {
+    await session.unsubscribe(subscription);
+  });
+}