diff -r acaea3179f4d -r 23d3a518d0ad madon_test.go
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/madon_test.go	Wed Apr 19 10:43:38 2017 +0200
@@ -0,0 +1,21 @@
+package madon
+
+import (
+	"testing"
+
+	"github.com/sendgrid/rest"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPrepareRequest(t *testing.T) {
+	mc := &Client{
+		Name:    "foo",
+		ID:      "666",
+		Secret:  "biiiip",
+		APIBase: "http://example.com",
+	}
+
+	req, err := mc.prepareRequest("bar", rest.Get, nil)
+	assert.NoError(t, err, "no error")
+	assert.NotNil(t, req.Headers, "not nil")
+}