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Sharing multiple layers across test files #9688

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petern-sc opened this issue Mar 12, 2025 · 0 comments
Open

Sharing multiple layers across test files #9688

petern-sc opened this issue Mar 12, 2025 · 0 comments
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@petern-sc
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petern-sc commented Mar 12, 2025 •
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Going off this example https://zio.dev/reference/test/sharing-layers-between-multiple-files, I'm able to get a single resource shared but this doesn't seem possible if I want to share multiple resources.

As an example, I have 2 test containers, Mysql and Kafka.
Some integration tests require only Mysql and some only Kafka, which works with this pattern

trait SharedDatabaseSpec extends ZIOSpec[TestEnvironment with MySQLContainer] {
  override val bootstrap: ZLayer[Any, Nothing, TestEnvironment with MySQLContainer] = testEnvironment ++ ZMySQLContainer.live
}

trait SharedKafkaSpec extends ZIOSpec[TestEnvironment with KafkaContainer] {
  override val bootstrap: ZLayer[Any, Nothing, TestEnvironment with KafkaContainer] = testEnvironment ++ KafkaContainer.live
}

But with some tests that require both Kafka and Database containers, this pattern no longer works.

MyExampleSpec extends SharedDatabaseSpec with SharedKafkaSpec { ... }

illegal inheritance;
 self-type RecoveryIntegrationSpec.type does not conform to zio.test.ZIOSpec[zio.test.TestEnvironment with com.dimafeng.testcontainers.MySQLContainer]'s selftype zio.test.ZIOSpec[zio.test.TestEnvironment with com.dimafeng.testcontainers.MySQLContainer]
object RecoveryIntegrationSpec extends SharedDatabaseSpec with SharedKafkaSpec {

I assume this is because both are overriding bootstrap and there isn't a way to compose at the traits level. One option I considered is to just have another trait which includes both types but I couldn't figure out if there's a way to memoize or re-use the same containers from the previous traits.

trait SharedContainerSpec extends ZIOSpec[TestEnvironment with KafkaContainer with MySQLContainer] {
  override val bootstrap: ZLayer[Any, Nothing, TestEnvironment with KafkaContainer] = testEnvironment ++ KafkaContainer.live ++ ZMySQLContainer.live
}

Is there any other way to achieve what I'm looking to do or is that not possible at the moment?

Also somewhat related to the layer sharing, is there a reason provideSome supports providing a list of layers, but provideSomeLayerShared only accepts a single zlayer?
@hearnadam hearnadam added the question Further information is requested label Mar 15, 2025
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@petern-sc @hearnadam