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test/controllers/HomeControllerSpec.scala

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+package controllers
+
+import org.scalatestplus.play._
+import org.scalatestplus.play.guice._
+import play.api.test._
+import play.api.test.Helpers._
+
+/**
+ * Add your spec here.
+ * You can mock out a whole application including requests, plugins etc.
+ *
+ * For more information, see https://www.playframework.com/documentation/latest/ScalaTestingWithScalaTest
+ */
+class HomeControllerSpec extends PlaySpec with GuiceOneAppPerTest with Injecting {
+
+  "HomeController GET" should {
+
+    "render the index page from a new instance of controller" in {
+      val controller = new HomeController(stubControllerComponents())
+      val home = controller.index().apply(FakeRequest(GET, "/"))
+
+      status(home) mustBe OK
+      contentType(home) mustBe Some("text/html")
+      contentAsString(home) must include ("Welcome to Play")
+    }
+
+    "render the index page from the application" in {
+      val controller = inject[HomeController]
+      val home = controller.index().apply(FakeRequest(GET, "/"))
+
+      status(home) mustBe OK
+      contentType(home) mustBe Some("text/html")
+      contentAsString(home) must include ("Welcome to Play")
+    }
+
+    "render the index page from the router" in {
+      val request = FakeRequest(GET, "/")
+      val home = route(app, request).get
+
+      status(home) mustBe OK
+      contentType(home) mustBe Some("text/html")
+      contentAsString(home) must include ("Welcome to Play")
+    }
+  }
+}