add test for ApiHelpController

build.sbt

@@ -52,6 +52,8 @@ lazy val swagger = (projectMatrix in file("."))
       libraryDependencies ++= Seq(
         "com.typesafe.play" %% "play" % "2.7.3",
         "com.typesafe.play" %% "routes-compiler" % "2.7.3",
+        "com.typesafe.play" %% "play-test" % "2.7.3" % Test,
+        "com.typesafe.play" %% "play-specs2" % "2.7.3" % Test,
         "io.swagger" % "swagger-core" % "1.5.24",
         "io.swagger" %% "swagger-scala-module" % "1.0.6",
         "com.fasterxml.jackson.module" %% "jackson-module-scala" % "2.9.10",
@@ -67,6 +69,8 @@ lazy val swagger = (projectMatrix in file("."))
       libraryDependencies ++= Seq(
         "com.typesafe.play" %% "play" % "2.8.0",
         "com.typesafe.play" %% "routes-compiler" % "2.8.0",
+        "com.typesafe.play" %% "play-test" % "2.8.0" % Test,
+        "com.typesafe.play" %% "play-specs2" % "2.8.0" % Test,
         "io.swagger" % "swagger-core" % "1.6.1",
         "io.swagger" %% "swagger-scala-module" % "1.0.6", // FIXME: no version supports jackson 2.10
         "com.fasterxml.jackson.module" %% "jackson-module-scala" % "2.10.5",
@@ -82,6 +86,8 @@ lazy val swagger = (projectMatrix in file("."))
       libraryDependencies ++= Seq(
         "com.typesafe.play" %% "play" % "2.9.0",
         "com.typesafe.play" %% "play-routes-compiler" % "2.9.0",
+        "com.typesafe.play" %% "play-test" % "2.9.0" % Test,
+        "com.typesafe.play" %% "play-specs2" % "2.9.0" % Test,
         "io.swagger" % "swagger-core" % "1.6.11",
         "io.swagger" %% "swagger-scala-module" % "1.0.6",
         "com.fasterxml.jackson.module" %% "jackson-module-scala" % "2.14.2",

src/test/scala/PlayApiHelpControllerSpec.scala

@@ -0,0 +1,21 @@
+import controllers.ApiHelpController
+import org.specs2.concurrent.ExecutionEnv
+import org.specs2.mutable._
+import play.api.libs.json.JsString
+import play.api.test.Helpers._
+import play.api.test.{FakeRequest, Helpers, WithApplication}
+import play.modules.swagger._
+
+class PlayApiHelpControllerSpec(implicit ee: ExecutionEnv) extends Specification {
+
+  "ApiHelpController" should {
+    "return the swagger specification" in new WithApplication {
+      val swaggerPlugin = new SwaggerPluginImpl(app.environment, app.configuration)
+      val controller = new ApiHelpController(Helpers.stubControllerComponents(), swaggerPlugin)
+      val result = controller.getResources(FakeRequest("GET", "/swagger.json"))
+      result.map(_.header.status) must beEqualTo (200).await
+      val body = contentAsJson(result)
+      (body \ "swagger").get must beEqualTo (JsString("2.0"))
+    }
+  }
+}