Ensure sealed traits keep working as expected

Author: SamTheisens

build.sbt

@@ -20,7 +20,7 @@ pomIncludeRepository := { x => false }
 
 libraryDependencies ++= Seq(
   "io.swagger.core.v3" % "swagger-core-jakarta" % "2.2.4",
-  "com.github.swagger-akka-http" %% "swagger-scala-module" % "2.7.7",
+  "com.github.swagger-akka-http" %% "swagger-scala-module" % "2.7.8",
   "com.fasterxml.jackson.module" %% "jackson-module-scala" % "2.13.4",
   "com.beachape" %% "enumeratum" % "1.7.0",
   "org.scalatest" %% "scalatest" % "3.2.14" % Test,

src/test/scala/com/github/swagger/enumeratum/converter/ModelPropertyParserTest.scala

@@ -3,6 +3,7 @@ package com.github.swagger.enumeratum.converter
 import io.swagger.v3.core.converter._
 import io.swagger.v3.oas.models.media._
 import models.{
+  Animal,
   Ctx,
   ModelWCtxEnum,
   ModelWCtxEnumAndAnnotation,
@@ -76,7 +77,7 @@ class ModelPropertyParserTest extends AnyFlatSpec with Matchers with OptionValue
 
     val field = model.value.getProperties.get("field")
     field shouldBe a[StringSchema]
-    field.asInstanceOf[StringSchema].getRequired shouldBe Seq.empty
+    field.asInstanceOf[StringSchema].getRequired shouldBe null
 
     val schema = field.asInstanceOf[StringSchema]
     schema.getDescription shouldEqual (null)
@@ -85,6 +86,26 @@ class ModelPropertyParserTest extends AnyFlatSpec with Matchers with OptionValue
     nullSafeList(model.value.getRequired) shouldBe Seq("field")
   }
 
+  it should "process sealed abstract class" in {
+    val converter = ModelConverters.getInstance()
+    val schemas = converter.readAll(classOf[Animal]).asScala.toMap
+    val catModel = findModel(schemas, "Cat")
+    catModel should be(defined)
+    val catProps = catModel.value.getProperties
+    catProps should have size 3
+    catProps.get("name") shouldBe a[StringSchema]
+    catProps.get("age") shouldBe a[IntegerSchema]
+    catProps.get("animalType") shouldBe a[StringSchema]
+    catModel.value.getRequired.asScala shouldEqual Seq("age", "animalType", "name")
+    val dogModel = findModel(schemas, "Dog")
+    dogModel should be(defined)
+    val dogProps = dogModel.value.getProperties
+    dogProps should have size 2
+    dogProps.get("name") shouldBe a[StringSchema]
+    dogProps.get("animalType") shouldBe a[StringSchema]
+    dogModel.value.getRequired.asScala shouldEqual Seq("animalType", "name")
+  }
+
   it should "not add additional model when enum field is annotated" in {
     val converter = ModelConverters.getInstance()
     val schemas = converter.readAll(classOf[ModelWCtxEnumAndAnnotation]).asScala.toMap

src/test/scala/models/SealedTraitModels.scala

@@ -0,0 +1,11 @@
+package models
+
+sealed abstract class Animal(val animalType: String) {
+  val name: String
+}
+
+class Dog(val name: String) extends Animal("Dog")
+
+class Cat(val name: String, val age: Int) extends Animal("Cat")
+
+case class PetOwner(owner: String, pet: Animal)