xmpp: Add test for negotiation behaviour

test/negotiator_test.dart

@@ -0,0 +1,68 @@
+import "package:test/test.dart";
+import "package:moxxyv2/xmpp/stringxml.dart";
+import "package:moxxyv2/xmpp/connection.dart";
+import "package:moxxyv2/xmpp/reconnect.dart";
+import "package:moxxyv2/xmpp/presence.dart";
+import "package:moxxyv2/xmpp/negotiators/negotiator.dart";
+
+import "helpers/logging.dart";
+
+const exampleXmlns1 = "im:moxxy:example1";
+const exampleNamespace1 = "im.moxxy.test.example1";
+const exampleXmlns2 = "im:moxxy:example2";
+const exampleNamespace2 = "im.moxxy.test.example2";
+
+class StubNegotiator1 extends XmppFeatureNegotiatorBase {
+  StubNegotiator1() : called = false, super(1, false, exampleXmlns1, exampleNamespace1);
+
+  bool called;
+  
+  @override
+  Future<void> negotiate(XMLNode nonza) async {
+    state = NegotiatorState.done;
+  }
+}
+
+class StubNegotiator2 extends XmppFeatureNegotiatorBase {
+  StubNegotiator2() : called = false, super(10, false, exampleXmlns2, exampleNamespace2);
+
+  bool called;
+  
+  @override
+  Future<void> negotiate(XMLNode nonza) async {
+    called = true;
+    state = NegotiatorState.done;
+  }
+}
+
+void main() {
+  initLogger();
+
+  final connection = XmppConnection(TestingReconnectionPolicy())
+    ..registerFeatureNegotiators([
+      StubNegotiator1(),
+      StubNegotiator2(),
+    ])
+    ..registerManagers([
+      PresenceManager(),
+    ]);
+  final features = [
+    XMLNode.xmlns(tag: "example1", xmlns: exampleXmlns1),
+    XMLNode.xmlns(tag: "example2", xmlns: exampleXmlns2),
+  ];
+
+  test("Test the priority system", () {
+    expect(connection.getNextNegotiator(features)?.id, exampleNamespace2);
+  });
+
+  test("Test negotiating features with no stream restarts", () async {
+    // TODO: Use a simple connection setup to test this
+    final streamFeatures = XMLNode(tag: "stream:features", children: features);
+    await connection.handleXmlStream(streamFeatures);
+
+    final negotiator1 = connection.getNegotiatorById(exampleNamespace1) as StubNegotiator1?;
+    final negotiator2 = connection.getNegotiatorById(exampleNamespace2) as StubNegotiator2?;
+    expect(negotiator1?.called, true);
+    expect(negotiator2?.called, true);
+  });
+}