1 files changed, 158 insertions, 0 deletions
diff --git a/devtools/shared/discovery/tests/xpcshell/test_discovery.js b/devtools/shared/discovery/tests/xpcshell/test_discovery.js
new file mode 100644
index 0000000000..cf14d7416c
--- /dev/null
+++ b/devtools/shared/discovery/tests/xpcshell/test_discovery.js
@@ -0,0 +1,158 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+
+"use strict";
+
+const { require } = ChromeUtils.importESModule(
+  "resource://devtools/shared/loader/Loader.sys.mjs"
+);
+const EventEmitter = require("resource://devtools/shared/event-emitter.js");
+const discovery = require("resource://devtools/shared/discovery/discovery.js");
+const { setTimeout, clearTimeout } = ChromeUtils.importESModule(
+  "resource://gre/modules/Timer.sys.mjs"
+);
+
+Services.prefs.setBoolPref("devtools.discovery.log", true);
+
+registerCleanupFunction(() => {
+  Services.prefs.clearUserPref("devtools.discovery.log");
+});
+
+function log(msg) {
+  info("DISCOVERY: " + msg);
+}
+
+// Global map of actively listening ports to TestTransport instances
+var gTestTransports = {};
+
+/**
+ * Implements the same API as Transport in discovery.js.  Here, no UDP sockets
+ * are used.  Instead, messages are delivered immediately.
+ */
+function TestTransport(port) {
+  EventEmitter.decorate(this);
+  this.port = port;
+  gTestTransports[this.port] = this;
+}
+
+TestTransport.prototype = {
+  send(object, port) {
+    log("Send to " + port + ":\n" + JSON.stringify(object, null, 2));
+    if (!gTestTransports[port]) {
+      log("No listener on port " + port);
+      return;
+    }
+    const message = JSON.stringify(object);
+    gTestTransports[port].onPacketReceived(null, message);
+  },
+
+  destroy() {
+    delete gTestTransports[this.port];
+  },
+
+  // nsIUDPSocketListener
+
+  onPacketReceived(socket, message) {
+    const object = JSON.parse(message);
+    object.from = "localhost";
+    log("Recv on " + this.port + ":\n" + JSON.stringify(object, null, 2));
+    this.emit("message", object);
+  },
+
+  onStopListening(socket, status) {},
+};
+
+// Use TestTransport instead of the usual Transport
+discovery._factories.Transport = TestTransport;
+
+// Ignore name generation on b2g and force a fixed value
+Object.defineProperty(discovery.device, "name", {
+  get() {
+    return "test-device";
+  },
+});
+
+add_task(async function () {
+  // At startup, no remote devices are known
+  deepEqual(discovery.getRemoteDevicesWithService("devtools"), []);
+  deepEqual(discovery.getRemoteDevicesWithService("penguins"), []);
+
+  discovery.scan();
+
+  // No services added yet, still empty
+  deepEqual(discovery.getRemoteDevicesWithService("devtools"), []);
+  deepEqual(discovery.getRemoteDevicesWithService("penguins"), []);
+
+  discovery.addService("devtools", { port: 1234 });
+
+  // Changes not visible until next scan
+  deepEqual(discovery.getRemoteDevicesWithService("devtools"), []);
+  deepEqual(discovery.getRemoteDevicesWithService("penguins"), []);
+
+  await scanForChange("devtools", "added");
+
+  // Now we see the new service
+  deepEqual(discovery.getRemoteDevicesWithService("devtools"), ["test-device"]);
+  deepEqual(discovery.getRemoteDevicesWithService("penguins"), []);
+
+  discovery.addService("penguins", { tux: true });
+  await scanForChange("penguins", "added");
+
+  deepEqual(discovery.getRemoteDevicesWithService("devtools"), ["test-device"]);
+  deepEqual(discovery.getRemoteDevicesWithService("penguins"), ["test-device"]);
+  deepEqual(discovery.getRemoteDevices(), ["test-device"]);
+
+  deepEqual(discovery.getRemoteService("devtools", "test-device"), {
+    port: 1234,
+    host: "localhost",
+  });
+  deepEqual(discovery.getRemoteService("penguins", "test-device"), {
+    tux: true,
+    host: "localhost",
+  });
+
+  discovery.removeService("devtools");
+  await scanForChange("devtools", "removed");
+
+  discovery.addService("penguins", { tux: false });
+  await scanForChange("penguins", "updated");
+
+  // Scan again, but nothing should be removed
+  await scanForNoChange("penguins", "removed");
+
+  // Split the scanning side from the service side to simulate the machine with
+  // the service becoming unreachable
+  gTestTransports = {};
+
+  discovery.removeService("penguins");
+  await scanForChange("penguins", "removed");
+});
+
+function scanForChange(service, changeType) {
+  return new Promise((resolve, reject) => {
+    const timer = setTimeout(() => {
+      reject(new Error("Reply never arrived"));
+    }, discovery.replyTimeout + 500);
+    discovery.on(service + "-device-" + changeType, function onChange() {
+      discovery.off(service + "-device-" + changeType, onChange);
+      clearTimeout(timer);
+      resolve();
+    });
+    discovery.scan();
+  });
+}
+
+function scanForNoChange(service, changeType) {
+  return new Promise((resolve, reject) => {
+    const timer = setTimeout(() => {
+      resolve();
+    }, discovery.replyTimeout + 500);
+    discovery.on(service + "-device-" + changeType, function onChange() {
+      discovery.off(service + "-device-" + changeType, onChange);
+      clearTimeout(timer);
+      reject(new Error("Unexpected change occurred"));
+    });
+    discovery.scan();
+  });
+}