diff --git a/controller/log/log_test.go b/controller/log/log_test.go
new file mode 100644
index 00000000..8be0fcb7
--- /dev/null
+++ b/controller/log/log_test.go
@@ -0,0 +1,16 @@
+package log
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestLog(t *testing.T) {
+	f := &bytes.Buffer{}
+	Default = New(f, &Config{})
+	Printf("hello %v", "everyone")
+	if !strings.HasSuffix(f.String(), "hello everyone\n") {
+		t.Fatal("fail")
+	}
+}