How to Inject Repository Dagger Dependency Instance in Your Integration Tests

Описание: Learn how to properly inject your `Repository` dependency in Kotlin integration tests using Dagger for effective dependency management.
---
This video is based on the question https://stackoverflow.com/q/71091341/ asked by the user 'redAce' ( https://stackoverflow.com/u/3557384/ ) and on the answer https://stackoverflow.com/a/71095053/ provided by the user 'Gaurav Chaudhari' ( https://stackoverflow.com/u/12636967/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to inject repository dagger dependency instance in my integration tests?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Inject Repository Dagger Dependency Instance in Your Integration Tests

When working on integration tests in a Kotlin application that uses Dagger for dependency injection, a common challenge is the proper injection of dependencies, such as repositories. If you've encountered the error message "lateinit property has not been initialized," you're not alone. This guide will guide you through the process of injecting a repository instance into your integration tests using Dagger.

Understanding the Problem

In your integration tests, you want to access the repository dependency. You might be trying to access it as follows:

[[See Video to Reveal this Text or Code Snippet]]

However, without proper initialization via Dagger, you'll see an error indicating that the lateinit property has not been initialized. This situation arises when Dagger does not know about the AppIntegTests class and cannot provide the necessary instance.

The Solution: Step-by-Step Guide

Here's how to make your repository accessible within your integration tests.

Step 1: Update Your TestAppComponent

To ensure that Dagger can inject your dependency into the AppIntegTests class, you need to add an injection function to your TestAppComponent. You should modify it as follows:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Call the inject Method in the Setup Function

Next, you need to call this new inject function in the setup method of your integration test class so that Dagger can initialize the dependencies correctly.

Here’s how to adjust your AppIntegTests class:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By following these steps, you can resolve the initialization issue with your repository dependency in integration tests:

Update TestAppComponent: Add an inject function that takes your test class.

Use the Inject Function: In your setup method, call this function to appropriately initialize dependencies.

By employing Dagger in this manner, you’re ensuring that your integration tests are set up correctly, allowing for better test coverage and reliable functionality. Happy testing!