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MountableExtension.kt
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MountableExtension.kt
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package io.kotest.core.extensions
import io.kotest.core.spec.Spec
/**
* A [MountableExtension] is an [Extension] that can return a materialized value to the
* user and allows for a configuration block.
*
* This allows extensions to return control objects which differ from the extension itself.
*
* For example:
*
* class MyTest : FunSpec() {
* init {
* val kafka = install(EmbeddedKafka) {
* port = 9092
* }
* }
* }
*
* Here `kafka` is a materialized value that contains details of the host/port of the
* started kafka instance and `EmbeddedKafka` is the extension itself.
*
*/
interface MountableExtension<CONFIG, MATERIALIZED> : Extension {
// cannot be suspending as it is invoked by install that is used in constructors
fun mount(configure: CONFIG.() -> Unit): MATERIALIZED
}
/**
* A [LazyMountableExtension] is an [Extension] that can return a materialized value to the
* user and allows for a configuration block.
*
* This allows extensions to return control objects which differ from the extension itself.
*
* For example:
*
* class MyTest : FunSpec() {
* init {
* val kafka = install(EmbeddedKafka) {
* port = 9092
* }
* }
* }
*
* Here `kafka` is a materialized value that contains details of the host/port of the
* started kafka instance and `EmbeddedKafka` is the extension itself.
*
*/
interface LazyMountableExtension<CONFIG, MATERIALIZED> : Extension {
// cannot be suspending as it is invoked by install that is used in constructors
fun mount(configure: CONFIG.() -> Unit): LazyMaterialized<MATERIALIZED>
}
data class LazyMaterialized<MATERIALIZED>(private var value: MATERIALIZED) {
fun set(value: MATERIALIZED) {
this.value = value
}
fun get() = value
}
// cannot be suspending as it is used in constructors
fun <CONFIG, MATERIALIZED> Spec.install(
ext: MountableExtension<CONFIG, MATERIALIZED>,
configure: CONFIG.() -> Unit = {}
): MATERIALIZED {
extensions(ext)
return ext.mount(configure)
}
// cannot be suspending as it is used in constructors
fun <CONFIG, MATERIALIZED> Spec.install(
ext: LazyMountableExtension<CONFIG, MATERIALIZED>,
configure: CONFIG.() -> Unit = {},
): LazyMaterialized<MATERIALIZED> {
extensions(ext)
return ext.mount(configure)
}