initial checkin

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

errors/message_test.go

@@ -0,0 +1,18 @@
+package errors
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestOnError(t *testing.T) {
+	onError := OnError("Failed to process [%s]", "filename")
+
+	err := fmt.Errorf("Cause")
+
+	err1 := onError(err)
+
+	assert.Equal(t, "Failed to process [filename], Caused By: Cause", err1.Error())
+}