diff --git a/cmd/syncthing/config_test.go b/cmd/syncthing/config_test.go
new file mode 100644
index 000000000..801d3d498
--- /dev/null
+++ b/cmd/syncthing/config_test.go
@@ -0,0 +1,113 @@
+package main
+
+import (
+	"bytes"
+	"io"
+	"reflect"
+	"testing"
+)
+
+func TestDefaultValues(t *testing.T) {
+	expected := OptionsConfiguration{
+		ListenAddress:      []string{":22000"},
+		ReadOnly:           false,
+		AllowDelete:        true,
+		FollowSymlinks:     true,
+		GUIEnabled:         true,
+		GUIAddress:         "127.0.0.1:8080",
+		GlobalAnnServer:    "announce.syncthing.net:22025",
+		GlobalAnnEnabled:   true,
+		LocalAnnEnabled:    true,
+		ParallelRequests:   16,
+		MaxSendKbps:        0,
+		RescanIntervalS:    60,
+		ReconnectIntervalS: 60,
+		MaxChangeKbps:      1000,
+	}
+
+	cfg, err := readConfigXML(bytes.NewReader(nil))
+	if err != io.EOF {
+		t.Error(err)
+	}
+
+	if !reflect.DeepEqual(cfg.Options, expected) {
+		t.Errorf("Default config differs;\n  E: %#v\n  A: %#v", expected, cfg.Options)
+	}
+}
+
+func TestNoListenAddress(t *testing.T) {
+	data := []byte(`<configuration version="1">
+    <repository directory="~/Sync">
+        <node id="..." name="...">
+            <address>dynamic</address>
+        </node>
+    </repository>
+    <options>
+        <listenAddress></listenAddress>
+    </options>
+</configuration>
+`)
+
+	cfg, err := readConfigXML(bytes.NewReader(data))
+	if err != nil {
+		t.Error(err)
+	}
+
+	expected := []string{""}
+	if !reflect.DeepEqual(cfg.Options.ListenAddress, expected) {
+		t.Errorf("Unexpected ListenAddress %#v", cfg.Options.ListenAddress)
+	}
+}
+
+func TestOverriddenValues(t *testing.T) {
+	data := []byte(`<configuration version="1">
+    <repository directory="~/Sync">
+        <node id="..." name="...">
+            <address>dynamic</address>
+        </node>
+    </repository>
+    <options>
+       <listenAddress>:23000</listenAddress>
+        <readOnly>true</readOnly>
+        <allowDelete>false</allowDelete>
+        <followSymlinks>false</followSymlinks>
+        <guiEnabled>false</guiEnabled>
+        <guiAddress>125.2.2.2:8080</guiAddress>
+        <globalAnnounceServer>syncthing.nym.se:22025</globalAnnounceServer>
+        <globalAnnounceEnabled>false</globalAnnounceEnabled>
+        <localAnnounceEnabled>false</localAnnounceEnabled>
+        <parallelRequests>32</parallelRequests>
+        <maxSendKbps>1234</maxSendKbps>
+        <rescanIntervalS>600</rescanIntervalS>
+        <reconnectionIntervalS>6000</reconnectionIntervalS>
+        <maxChangeKbps>2345</maxChangeKbps>
+    </options>
+</configuration>
+`)
+
+	expected := OptionsConfiguration{
+		ListenAddress:      []string{":23000"},
+		ReadOnly:           true,
+		AllowDelete:        false,
+		FollowSymlinks:     false,
+		GUIEnabled:         false,
+		GUIAddress:         "125.2.2.2:8080",
+		GlobalAnnServer:    "announce.nym.se:22025",
+		GlobalAnnEnabled:   false,
+		LocalAnnEnabled:    false,
+		ParallelRequests:   32,
+		MaxSendKbps:        1234,
+		RescanIntervalS:    600,
+		ReconnectIntervalS: 6000,
+		MaxChangeKbps:      2345,
+	}
+
+	cfg, err := readConfigXML(bytes.NewReader(data))
+	if err != nil {
+		t.Error(err)
+	}
+
+	if !reflect.DeepEqual(cfg.Options, expected) {
+		t.Errorf("Overridden config differs;\n  E: %#v\n  A: %#v", expected, cfg.Options)
+	}
+}