Backchannel for UITesting.
Snapshot is awesome.
Now it uses UI Testing.
UI Testing is massively better than UI Automation - but sometimes, you just want to cheat.
HSTestingBackchannel gives you a simple method to send messages from your UITesting tests directly to your running app in the form of notifications.
Installation
Install with CocoaPods
pod 'HSTestingBackchannel', :configuration => ['Debug']
Usage
- set an 'Active Compilation Condition' in your swift project to define SNAPSHOT
- In your App Delegate, install the helper
#if SNAPSHOT
import HSTestingBackchannel
#endif
And then, in application(_:didFinishLaunchingWithOptions:)
:
#ifdef SNAPSHOT
HSTestingBackchannel.installReceiver()
#endif
- Send notifications from your UITesting class
HSTestingBackchannel.sendNotification("SnapshotTest")
or
HSTestingBackchannel.sendNotification("SnapshotTest",with: ["aKey":"aValue"])
- Respond to notifications within your app
#if SNAPSHOT
NotificationCenter.default.addObserver(
forName: NSNotification.Name("SnapshotTest"),
object: nil,
queue: .main) { _ in
//Do Something
})
#endif
Bonus - Copy dummy files to the Simulator
Within a test method (or in setUp), call something like
HSTestingBackchannel.installFiles(from: "..pathTo/fastlane/DummyImages",
to: HSTestingResources)
This will install the contents of DummyImages in the resources folder of your running app. You can also install directly to the Documents directory in the app.
Multiple Simultaneous Simulators
By default, Fastlane now runs multiple simulators simultaneously. This means you need to make sure that the server for each simulator is running on a different test.
Use the setup method to do the following
let app = XCUIApplication()
HSTestingBackchannel.port = UInt.random(in: 8000 ... 60000)
app.launchArguments.append(contentsOf: ["-HSTestingBackchannelPort", "\(HSTestingBackchannel.port)"])
Snapshot.setupSnapshot(app, waitForAnimations: true)
app.launch()
How it works
HSTestingBackchannel installs a webserver in your main app (GCDWebServer).
You simply send requests directly to that - and it recognises them and broadcasts NSNotifications