Add a httptest simple example, I'm thinking to obselete the gitbook entirely, the feature/_example folder is easier for the users

Former-commit-id: 6d4143e63838164a6b1bf1184b0c86a6b3fe15cd

httptest/_example/main_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"testing"
+
+	"gopkg.in/kataras/iris.v6/httptest"
+)
+
+// $ cd _example
+// $ go test -v
+func TestNewApp(t *testing.T) {
+	app := newApp()
+	e := httptest.New(app, t)
+
+	// test nauthorized
+	e.GET("/hello").Expect().Status(401).Body().Equal("<h1> Unauthorized Page! </h1>")
+	// test our login flash message
+	name := "myname"
+	e.POST("/login").WithFormField("name", name).Expect().Status(200)
+	// test the /hello again with the flash (a message which deletes itself after it has been shown to the user)
+	// setted on /login previously.
+	expectedResponse := map[string]interface{}{
+		"Message": "Hello",
+		"From":    name,
+	}
+	e.GET("/hello").Expect().Status(200).JSON().Equal(expectedResponse)
+	// test /hello nauthorized again, it should be return 401 now (flash should be removed)
+	e.GET("/hello").Expect().Status(401).Body().Equal("<h1> Unauthorized Page! </h1>")
+}
+
+// for advanced test examples navigate there:
+// https://github.com/gavv/httpexpect/blob/master/_examples/iris_test.go