add a test example for upload files as requested at: #1516

Former-commit-id: afb2d3e9c0902cce6c46d26b5b6cfc51551c2373

_examples/http_request/upload-files/main_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"net/http"
+	"os"
+	"testing"
+
+	"github.com/kataras/iris/v12/httptest"
+)
+
+func TestUploadFiles(t *testing.T) {
+	app := newApp()
+	e := httptest.New(t, app)
+
+	// upload the file itself.
+	fh, err := os.Open("main.go")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer fh.Close()
+
+	e.POST("/upload").WithMultipart().WithFile("files", "main.go", fh).
+		Expect().Status(http.StatusOK)
+
+	f, err := os.Open("uploads/main.go")
+	if err != nil {
+		t.Fatalf("expected file to get actually uploaded on the system directory but: %v", err)
+	}
+	f.Close()
+
+	os.Remove(f.Name())
+}