diff --git a/app/config_test.go b/app/config_test.go
new file mode 100644
index 0000000..f5ba383
--- /dev/null
+++ b/app/config_test.go
@@ -0,0 +1,126 @@
+package app
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/spf13/viper"
+	"path/filepath"
+	"os"
+	"time"
+	"strconv"
+	"bytes"
+	"io/ioutil"
+	"encoding/json"
+)
+
+func TestParseConfig(t *testing.T) {
+	viper.Reset()
+
+	tmpDir := filepath.Join(os.TempDir(), "dave__"+strconv.FormatInt(time.Now().UnixNano(), 10))
+	os.Mkdir(tmpDir, 0700)
+	defer os.RemoveAll(tmpDir)
+
+	tests := []struct {
+		name string
+		want *Config
+	}{
+		{"default", cfg(t, tmpDir, `
+address: 1.2.3.4
+port: 42
+prefix: /oh-de-lally
+tls:
+  keyFile: `+ tmpDir+ `/robin.pem
+  certFile: `+ tmpDir+ `/tuck.pem
+dir: /sherwood/forest
+realm: uk
+users:
+  lj:
+    password: 123
+    subdir: /littlejohn
+  srf:
+    password: 234
+    subdir: /sheriff
+log:
+  error: true
+`)},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+
+			if got := ParseConfig(); !reflect.DeepEqual(got, tt.want) {
+				gotJson, _ := json.Marshal(got)
+				wantJson, _ := json.Marshal(tt.want)
+				t.Errorf("ParseConfig() = %s, want %s", gotJson, wantJson)
+			}
+		})
+	}
+}
+
+func cfg(t *testing.T, tmpDir string, content string) *Config {
+	viper.SetConfigType("yaml")
+	var yamlCfg = []byte(content)
+
+	err := ioutil.WriteFile(filepath.Join(tmpDir, "config.yaml"), yamlCfg, 0600)
+	if err != nil {
+		t.Errorf("error writing test config. error = %v", err)
+	}
+
+	err = viper.ReadConfig(bytes.NewBuffer(yamlCfg))
+	if err != nil {
+		t.Errorf("error reading test config. error = %v", err)
+	}
+	var cfg = &Config{}
+	viper.Unmarshal(&cfg)
+
+	// let viper read from the tmp directory fist
+	viper.AddConfigPath(tmpDir)
+
+	// add dummy cert and key file
+	_, err = os.OpenFile(filepath.Join(tmpDir, "robin.pem"), os.O_RDWR|os.O_CREATE, 0644)
+	if err != nil {
+		t.Errorf("error creating key file. error = %v", err)
+		return nil
+	}
+
+	_, err = os.OpenFile(filepath.Join(tmpDir, "tuck.pem"), os.O_RDWR|os.O_CREATE, 0644)
+	if err != nil {
+		t.Errorf("error creating cert file. error = %v", err)
+		return nil
+	}
+	viper.AddConfigPath(tmpDir)
+
+	return cfg
+}
+
+func TestSetDefaults(t *testing.T) {
+	viper.Reset()
+
+	tests := []struct {
+		name  string
+		value interface{}
+	}{
+		{"Address", "127.0.0.1"},
+		{"Port", "8000"},
+		{"Prefix", ""},
+		{"Dir", "/tmp"},
+		{"TLS", nil},
+		{"Realm", "dave"},
+		{"Log.Error", true},
+		{"Log.Create", false},
+		{"Log.Read", false},
+		{"Log.Update", false},
+		{"Log.Delete", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			viper.Reset()
+
+			setDefaults()
+
+			if viper.Get(tt.name) != tt.value {
+				t.Errorf("Default Keys doesn't fit. name = %v, want = %v", tt.name, tt.value)
+			}
+		})
+	}
+}