Run the mount configure() hook before starting the container, so it can be configured in the hook.

Fixes #125

Author: Kantis

src/main/kotlin/io/kotest/extensions/testcontainers/ContainerExtension.kt

@@ -73,16 +73,16 @@ class ContainerExtension<T : GenericContainer<*>>(
 
  /**
  * Mounts the container, starting it if necessary. The [configure] block will be invoked
- * every time the container is mounted, and after the container has started.
+ * every time the [ContainerExtension] is mounted, before the container is started.
  */
  override fun mount(configure: T.() -> Unit): T = container.apply{
+ configure()
+
  if (!isRunning) {
  beforeStart()
  start()
  afterStart()
  }
-
- configure()
  }
 
  override suspend fun beforeTest(testCase: TestCase) {

src/test/kotlin/io/kotest/extensions/testcontainers/ContainerExtensionSpecLifecycleTest.kt

@@ -4,12 +4,15 @@ import com.redis.testcontainers.RedisContainer
 import io.kotest.core.extensions.install
 import io.kotest.core.spec.style.FunSpec
 import io.kotest.matchers.shouldBe
+import org.testcontainers.containers.GenericContainer
 import redis.clients.jedis.JedisPool
 
 class ContainerExtensionSpecLifecycleTest : FunSpec() {
  init {
 
- val container = install(ContainerExtension(RedisContainer("7.2.5-alpine"), ContainerLifecycleMode.Spec)) {
+ // Using GenericContainer (which includes no out-of-the-box port mappings
+ // to ensure the configure hook exposes ports correctly
+ val container = install(ContainerExtension(GenericContainer("redis:7.2.5-alpine"), ContainerLifecycleMode.Spec)) {
  startupAttempts = 2
  withExposedPorts(6379)
  }