Automated testing

Go comes with excellent built-in support for automated tests. Encore builds on top of this foundation, and lets you write tests in exactly the same way. We won't cover the basics of how to write tests here, see the official Go docs for that. Let's instead focus on the difference between testing in Encore compared to a standard Go application.

The main difference is that since Encore requires an extra compilation step, you must run your tests using encore test instead of go test. This is a wrapper that compiles the Encore app and then runs go test. It supports all the same flags that the go test command does.

For example, use encore test ./... to run tests in all sub-directories, or just encore test for the current directory.

Integration testing

Since Encore removes almost all boilerplate, most of the code you write is business logic that involves databases and calling APIs between services. Such behavior is most easily tested with integration tests.

When running tests, Encore automatically sets up the databases you need in a separate database cluster. They are additionally configured to skip fsync and to use an in-memory filesystem since durability is not a concern for automated tests.

This drastically reduces the speed overhead of writing integration tests.

In general, Encore applications tend to focus more on integration tests compared to traditional applications that are heavier on unit tests. This is nothing to worry about and is the recommended best practice.

Test-only infrastructure

Encore allows tests to define infrastructure resources specifically for testing. This can be useful for testing library code that interacts with infrastructure.

For example, the x.encore.dev/pubsub/outbox package defines a test-only database that is used to do integration testing of the outbox functionality.