support enummodule in scalamodule builder (built-ins) (#708)

Author: pjfanning

src/main/scala-2.+/tools/jackson/module/scala/BuiltinModules.scala

@@ -0,0 +1,6 @@
+package tools.jackson.module.scala
+
+private[scala] object BuiltinModules {
+  def addScalaVersionSpecificModules(builder: ScalaModule.Builder): ScalaModule.Builder =
+    builder
+}

src/main/scala-3/tools/jackson/module/scala/BuiltinModules.scala

@@ -0,0 +1,8 @@
+package tools.jackson.module.scala
+
+private[scala] object BuiltinModules {
+  def addScalaVersionSpecificModules(builder: ScalaModule.Builder): ScalaModule.Builder = {
+    builder.addModule(EnumModule)
+    builder
+  }
+}

src/main/scala/tools/jackson/module/scala/ScalaModule.scala

@@ -53,6 +53,7 @@ object ScalaModule {
       addModule(UntypedObjectDeserializerModule)
       addModule(EitherModule)
       addModule(SymbolModule)
+      BuiltinModules.addScalaVersionSpecificModules(this)
       this
     }
 

src/test/scala-3/tools/jackson/module/scala/Scala3ModuleTest.scala

@@ -0,0 +1,10 @@
+package tools.jackson.module.scala
+
+class ScalaModule3Test extends BaseSpec {
+  "A ScalaModule builder" should "support addAllBuiltinModules" in {
+    val cfg = ScalaModule.builder().addAllBuiltinModules()
+    // ScalaModuleTest tests the modules that work in Scala 2 and 3
+    // here we test the Scala3 specific classes
+    cfg.hasModule(EnumModule) shouldBe true
+  }
+}