HandleHTTPError MVC Method as requested at #1595. Read HISTORY.md

example at: https://github.com/kataras/iris/tree/master/_examples/mvc/error-handler-http

_examples/mvc/error-handler-http/main_test.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/kataras/iris/v12/httptest"
+)
+
+func TestControllerHandleHTTPError(t *testing.T) {
+	const (
+		expectedIndex    = "Hello!"
+		expectedNotFound = "<h3>Not Found Custom Page Rendered through Controller's HandleHTTPError</h3>"
+	)
+
+	app := newApp()
+
+	e := httptest.New(t, app)
+	e.GET("/").Expect().Status(httptest.StatusOK).Body().Equal(expectedIndex)
+	e.GET("/a_notefound").Expect().Status(httptest.StatusNotFound).ContentType("text/html").Body().Equal(expectedNotFound)
+}