feat: add unit tests for previewDevicesService

Author: Fatme

test/services/preview-devices-service.ts

@@ -0,0 +1,102 @@
+import { Yok } from "../../lib/common/yok";
+import { PreviewDevicesService } from "../../lib/services/livesync/playground/devices/preview-devices-service";
+import { Device } from "nativescript-preview-sdk";
+import { assert } from "chai";
+import { DeviceDiscoveryEventNames } from "../../lib/common/constants";
+import { LoggerStub } from "../stubs";
+
+let foundDevices: Device[] = [];
+let lostDevices: Device[] = [];
+
+function createTestInjector(): IInjector {
+	const injector = new Yok();
+	injector.register("previewDevicesService", PreviewDevicesService);
+	injector.register("logger", LoggerStub);
+	return injector;
+}
+
+function createDevice(id: string): Device {
+	return {
+		id,
+		platform: "ios",
+		model: "my test model",
+		name: "my test name",
+		osVersion: "10.0.0",
+		previewAppVersion: "19.0.0",
+		runtimeVersion: "5.0.0"
+	};
+}
+
+describe.only("PreviewDevicesService", () => {
+	describe("onDevicesPresence", () => {
+		let previewDevicesService: IPreviewDevicesService = null;
+		beforeEach(() => {
+			const injector = createTestInjector();
+			previewDevicesService = injector.resolve("previewDevicesService");
+			previewDevicesService.on(DeviceDiscoveryEventNames.DEVICE_FOUND, device => {
+				foundDevices.push(device);
+			});
+			previewDevicesService.on(DeviceDiscoveryEventNames.DEVICE_LOST, device => {
+				lostDevices.push(device);
+			});
+		});
+
+		afterEach(() => {
+			previewDevicesService.removeAllListeners();
+			foundDevices = [];
+			lostDevices = [];
+		});
+
+		it("should add new device", () => {
+			const device = createDevice("device1");
+
+			previewDevicesService.onDevicesPresence([device]);
+
+			assert.deepEqual(previewDevicesService.connectedDevices, [device]);
+			assert.deepEqual(foundDevices, [device]);
+			assert.deepEqual(lostDevices, []);
+		});
+		it("should add new device when there are already connected devices", () => {
+			const device1 = createDevice("device1");
+			const device2 = createDevice("device2");
+			previewDevicesService.connectedDevices = [device1];
+
+			previewDevicesService.onDevicesPresence([device1, device2]);
+
+			assert.deepEqual(previewDevicesService.connectedDevices, [device1, device2]);
+			assert.deepEqual(foundDevices, [device2]);
+			assert.deepEqual(lostDevices, []);
+		});
+		it("should add more than one new device", () => {
+			const device1 = createDevice("device1");
+			const device2 = createDevice("device2");
+			const device3 = createDevice("device3");
+
+			previewDevicesService.onDevicesPresence([device1, device2, device3]);
+
+			assert.deepEqual(previewDevicesService.connectedDevices, [device1, device2, device3]);
+			assert.deepEqual(foundDevices, [device1, device2, device3]);
+			assert.deepEqual(lostDevices, []);
+		});
+		it("should remove device", () => {
+			const device1 = createDevice("device1");
+			previewDevicesService.connectedDevices = [device1];
+
+			previewDevicesService.onDevicesPresence([]);
+
+			assert.deepEqual(foundDevices, []);
+			assert.deepEqual(lostDevices, [device1]);
+		});
+		it("should add and remove devices in the same time", () => {
+			const device1 = createDevice("device1");
+			const device2 = createDevice("device2");
+			previewDevicesService.connectedDevices = [device1];
+
+			previewDevicesService.onDevicesPresence([device2]);
+
+			assert.deepEqual(previewDevicesService.connectedDevices, [device2]);
+			assert.deepEqual(foundDevices, [device2]);
+			assert.deepEqual(lostDevices, [device1]);
+		});
+	});
+});