Mobile in-app subscriptions are the most popular monetization method for most non-gaming apps these days. Yet implementing and testing in-app subscriptions in iOS is a complicated task.
Luckily Apple has presented a set of new convenient features for StoreKit testing in their Introducing StoreKit Testing in Xcode session during WWDC 2020. We have summarized the key changes for you.
- StoreKit Configuration File – allows you to set up the in-app products for testing directly in Xcode 12. No need to create them in App Store Connect anymore.
- StoreKit Transaction Manager – transaction manager allows you to see all in-app purchases locally and manage their statuses;
- StoreKitTest Framework – a new framework for running tests in Xcode that provides full control over them;
- Sandbox subscription management on devices.
StoreKit Configuration File
StoreKit Configuration File allows you to set up a local environment for in-app purchases testing without creating in-app products in App Store Connect.
To create StoreKit Configureation file just go File → New → File
You can use three product types:
- Consumable In-App Purchase
- Non-Consumable In-App Purchase
- Auto-Renewable Subscription
Now it is possible to change the rate at which time passes for auto-renewable subscriptions in a test environment using the Time Rate configuration:
StoreKit Transaction Manager
StoreKit Transaction Manager is a very useful tool for local development and in-app subscription testing.
StoreKit Transaction Manager allows to:
- cancel a subscription
- refund a subscription
- reset a subscription (as if a purchase never happened)
- set a billing retry state for a subscription
To access the StoreKit Transaction Manager you need to choose your StoreKit Configuration File and click on the icon in the debugging area(field/bar).
New StoreKitTest framework works together with StoreKit Configuration File and allows creating Unit and UI tests. It allows testing automation for in-app purchases. The state is managed by SKTestSession. You can test:
- Successful purchases
- Failed purchases
- Interrupted purchases
- External transactions
- Subscription offers
Managing Sandbox subscriptions
Sandbox subscription can be canceled or changed to another subscription within the same subscription group on a device.
There is also a new Reset Eligibility setting that resets the introductory offer. You no longer need to create a new sandbox account for testing.
New features provide developers with a flexible environment and in-app transaction management tools. New capabilities of in-app test automation will help ship faster to the App Store and implement a more reliable in-app subscription.
To the best of my knowledge, it is the most significant update of testing capabilities for in-app purchases on iOS. I am sure it will improve the developer experience with in-apps and reduce the problems of in-app product implementation.
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