Add map and functor instance for Example

build.sbt

@@ -126,7 +126,9 @@ lazy val cats: Project = (project in file("integrations/cats"))
     libraryDependencies ++= Seq(
       "org.typelevel" %% "cats-core" % "2.1.1",
       scalaTest % Test,
-      scalaCheck % Test
+      scalaCheck % Test,
+      "org.typelevel" %% "discipline-scalatest" % "1.0.1" % Test,
+      "org.typelevel" %% "cats-laws" % "2.1.1" % Test
     )
   )
   .dependsOn(core)

core/src/main/scala/sttp/tapir/EndpointIO.scala

@@ -421,7 +421,9 @@ object EndpointIO {
 
   //
 
-  case class Example[+T](value: T, name: Option[String], summary: Option[String])
+  case class Example[+T](value: T, name: Option[String], summary: Option[String]) {
+    def map[B](f: T => B): Example[B] = copy(value = f(value))
+  }
 
   object Example {
     def of[T](t: T, name: Option[String] = None, summary: Option[String] = None): Example[T] = Example(t, name, summary)

integrations/cats/src/main/scala/sttp/tapir/integ/cats/ExampleInstances.scala

@@ -0,0 +1,10 @@
+package sttp.tapir.integ.cats
+
+import cats.Functor
+import sttp.tapir.EndpointIO.Example
+
+trait ExampleInstances {
+  implicit val exampleFunctor: Functor[Example] = new Functor[Example] {
+    override def map[A, B](example: Example[A])(f: A => B): Example[B] = example.map(f)
+  }
+}

integrations/cats/src/main/scala/sttp/tapir/integ/cats/instances.scala

@@ -0,0 +1,3 @@
+package sttp.tapir.integ.cats
+
+object instances extends ExampleInstances

integrations/cats/src/test/scala/sttp/tapir/integ/cats/ExampleFunctorLawSpec.scala

@@ -0,0 +1,26 @@
+package sttp.tapir.integ.cats
+
+import cats.Eq
+import cats.implicits._
+import cats.laws.discipline.FunctorTests
+import org.scalacheck.Arbitrary
+import org.scalatest.funsuite.AnyFunSuite
+import org.scalatestplus.scalacheck.Checkers
+import org.typelevel.discipline.scalatest.FunSuiteDiscipline
+import sttp.tapir.EndpointIO.Example
+import sttp.tapir.integ.cats.instances._
+
+class ExampleFunctorLawSpec  extends AnyFunSuite with FunSuiteDiscipline with Checkers {
+  implicit def eqTree[A: Eq]: Eq[Example[A]] = Eq.fromUniversalEquals
+
+  implicit def exampleArbitrary[T: Arbitrary]: Arbitrary[Example[T]] = Arbitrary {
+    for {
+      t <- Arbitrary.arbitrary[T]
+      name <- Arbitrary.arbitrary[Option[String]]
+      summary <- Arbitrary.arbitrary[Option[String]]
+    } yield Example(t, name, summary)
+  }
+
+  checkAll("Example.FunctorLaws", FunctorTests[Example].functor[Int, Int, String])
+}
+

integrations/cats/src/test/scala/sttp/tapir/integ/cats/TapirCodecCatsTest.scala

@@ -2,7 +2,8 @@ package sttp.tapir.integ.cats
 
 import cats.data.{NonEmptyChain, NonEmptyList, NonEmptySet}
 import org.scalacheck.{Arbitrary, Gen}
-import org.scalatest.{FlatSpec, Matchers}
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
 import org.scalatestplus.scalacheck.Checkers
 import org.scalacheck.Arbitrary.arbString
 import sttp.tapir.SchemaType.{SArray, SString}
@@ -12,7 +13,7 @@ import codec._
 
 import scala.collection.immutable.SortedSet
 
-class TapirCodecCatsTest extends FlatSpec with Matchers with Checkers {
+class TapirCodecCatsTest extends AnyFlatSpec with Matchers with Checkers {
   case class Test(value: String)
 
   it should "find schema for cats collections" in {