Add alias for creating a generic container definition

README.md

@@ -455,6 +455,15 @@ object NginxContainer {
 }
 ```
 
+However, if you don't want to create a custom container, you can use `GenericContainer` directly while overriding `containerDef`:
+
+```scala
+override val containerDef = GenericContainer.Def("nginx:latest",
+  exposedPorts = Seq(80),
+  waitStrategy = Wait.forHttp("/")
+)
+```
+
 ### Migration from the classic API
 
 1. If you have custom containers created with the `GenericContainer`, add `ContainerDef` in the companion like this:

core/src/main/scala/com/dimafeng/testcontainers/GenericContainer.scala

@@ -83,4 +83,36 @@ object GenericContainer {
     override type Container = C
     protected def createContainer(): C = init
   }
+
+  object Def {
+
+    private final case class Default(dockerImage: DockerImage,
+                                     exposedPorts: Seq[Int] = Seq(),
+                                     env: Map[String, String] = Map(),
+                                     command: Seq[String] = Seq(),
+                                     classpathResourceMapping: Seq[(String, String, BindMode)] = Seq(),
+                                     waitStrategy: WaitStrategy = null,
+                                     labels: Map[String, String] = Map.empty,
+                                     tmpFsMapping: Map[String, String] = Map.empty,
+                                     imagePullPolicy: ImagePullPolicy = null) extends Def[GenericContainer](
+      GenericContainer(
+        dockerImage, exposedPorts, env, command, classpathResourceMapping, waitStrategy, 
+        labels, tmpFsMapping, imagePullPolicy)
+    )
+
+    def apply(dockerImage: DockerImage,
+              exposedPorts: Seq[Int] = Seq(),
+              env: Map[String, String] = Map(),
+              command: Seq[String] = Seq(),
+              classpathResourceMapping: Seq[(String, String, BindMode)] = Seq(),
+              waitStrategy: WaitStrategy = null,
+              labels: Map[String, String] = Map.empty,
+              tmpFsMapping: Map[String, String] = Map.empty,
+              imagePullPolicy: ImagePullPolicy = null): GenericContainer.Def[GenericContainer] = 
+      Default(
+        dockerImage, exposedPorts, env, command, classpathResourceMapping, waitStrategy, 
+        labels, tmpFsMapping, imagePullPolicy)
+
+  }
+
 }

test-framework/scalatest/src/test/scala/com/dimafeng/testcontainers/GenericContainerSpec.scala

@@ -0,0 +1,21 @@
+package com.dimafeng.testcontainers
+
+import org.scalatest.flatspec.AnyFlatSpec
+import scala.io.Source
+import java.net.URL
+import com.dimafeng.testcontainers.scalatest.TestContainerForAll
+import org.testcontainers.containers.wait.strategy.Wait
+import com.dimafeng.testcontainers.GenericContainer.Def
+
+class GenericContainerSpec extends AnyFlatSpec with TestContainerForAll {
+  override val containerDef: Def[GenericContainer] = GenericContainer.Def("nginx:latest",
+    exposedPorts = Seq(80),
+    waitStrategy = Wait.forHttp("/")
+  )
+
+  "GenericContainer" should "start nginx and expose 80 port" in withContainers { case container =>
+    assert(Source.fromInputStream(
+      new URL(s"http://${container.containerIpAddress}:${container.mappedPort(80)}/").openConnection().getInputStream
+    ).mkString.contains("If you see this page, the nginx web server is successfully installed"))
+  }
+}