diff --git a/internal/server/user/mux.go b/internal/server/user/mux.go
new file mode 100644
index 0000000..c47aaca
--- /dev/null
+++ b/internal/server/user/mux.go
@@ -0,0 +1,25 @@
+package user
+
+import (
+	"sync"
+
+	"github.com/gorilla/mux"
+)
+
+type swappableMux struct {
+	m    sync.RWMutex
+	root mux.Router
+}
+
+func (sm *swappableMux) get() mux.Router {
+	sm.m.RLock()
+	defer sm.m.RUnlock()
+
+	return sm.root
+}
+
+func (sm *swappableMux) set(mux mux.Router) {
+	sm.m.Lock()
+	sm.root = mux
+	sm.m.Unlock()
+}
diff --git a/internal/server/user/mux_test.go b/internal/server/user/mux_test.go
new file mode 100644
index 0000000..154c0b5
--- /dev/null
+++ b/internal/server/user/mux_test.go
@@ -0,0 +1,121 @@
+package user
+
+import (
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/gorilla/mux"
+)
+
+func TestSwappableMuxGetReturnsTheCurrentMux(t *testing.T) {
+	sm := swappableMux{}
+	mux := sm.get()
+	if !reflect.DeepEqual(mux, sm.root) {
+		t.Errorf("Returned mux is not the same %#v", mux)
+	}
+}
+
+func TestSwappableMuxGetReturnsADifferentInstance(t *testing.T) {
+	sm := swappableMux{}
+	mux := sm.get()
+	if &mux == &sm.root {
+		t.Error("Returned mux is the same instance")
+	}
+}
+
+func TestSwappableMuxGetWaitsForTheMutexToBeReleased(t *testing.T) {
+	sm := swappableMux{}
+
+	sm.m.Lock()
+	defer sm.m.Unlock()
+
+	c := make(chan mux.Router)
+	go func() { c <- sm.get() }()
+
+	time.Sleep(10 * time.Millisecond)
+
+	select {
+	case <-c:
+		t.Error("Didn't acquire the mutex")
+	default:
+	}
+}
+
+func TestSwappableMuxGetIsAbleToReadWhileOthersAreReading(t *testing.T) {
+	sm := swappableMux{}
+
+	sm.m.RLock()
+	defer sm.m.RUnlock()
+
+	c := make(chan mux.Router)
+	go func() { c <- sm.get() }()
+
+	time.Sleep(10 * time.Millisecond)
+
+	select {
+	case <-c:
+	default:
+		t.Error("The mutex cannot be acquired")
+	}
+}
+
+func TestSwappableMuxSetSetsTheGivenMux(t *testing.T) {
+	sm := swappableMux{}
+	mux := mux.Router{
+		KeepContext: true,
+	}
+
+	sm.set(mux)
+
+	if !sm.root.KeepContext {
+		t.Error("mux not set")
+	}
+}
+
+func TestSwappableMuxSetSetsADifferentInstance(t *testing.T) {
+	sm := swappableMux{}
+	mux := mux.Router{}
+
+	sm.set(mux)
+
+	if &mux == &sm.root {
+		t.Error("Set mux is the same instance")
+	}
+}
+
+func TestSwappableMuxSetWaitsForWriterToReleaseMutex(t *testing.T) {
+	sm := swappableMux{}
+
+	sm.m.Lock()
+	defer sm.m.Unlock()
+
+	c := make(chan bool)
+	go func() { sm.set(mux.Router{}); c <- true }()
+
+	time.Sleep(10 * time.Millisecond)
+
+	select {
+	case <-c:
+		t.Error("Didn't acquire the mutex")
+	default:
+	}
+}
+
+func TestSwappableMuxSetWaitsForReadersToReleaseMutex(t *testing.T) {
+	sm := swappableMux{}
+
+	sm.m.RLock()
+	defer sm.m.RUnlock()
+
+	c := make(chan bool)
+	go func() { sm.set(mux.Router{}); c <- true }()
+
+	time.Sleep(10 * time.Millisecond)
+
+	select {
+	case <-c:
+		t.Error("Didn't acquire the mutex")
+	default:
+	}
+}
diff --git a/internal/server/user/server.go b/internal/server/user/server.go
index 98edb84..ff8b332 100644
--- a/internal/server/user/server.go
+++ b/internal/server/user/server.go
@@ -2,29 +2,8 @@ package user
 
 import (
 	"net/http"
-	"sync"
-
-	"github.com/gorilla/mux"
 )
 
-type swappableMux struct {
-	m    sync.RWMutex
-	root mux.Router
-}
-
-func (sm *swappableMux) get() mux.Router {
-	sm.m.RLock()
-	defer sm.m.RUnlock()
-
-	return sm.root
-}
-
-func (sm *swappableMux) set(mux mux.Router) {
-	sm.m.Lock()
-	sm.root = mux
-	sm.m.Unlock()
-}
-
 var Server http.Server
 
 func Run() {
diff --git a/internal/server/user/server_test.go b/internal/server/user/server_test.go
index c7d1777..d5eed30 100644
--- a/internal/server/user/server_test.go
+++ b/internal/server/user/server_test.go
@@ -1,123 +1,3 @@
 package user
 
-import (
-	"reflect"
-	"testing"
-	"time"
-
-	"github.com/gorilla/mux"
-)
-
 // TODO TestRunRunsAnHTTPServer(t *testing.T) {}
-
-func TestSwappableMuxGetReturnsTheCurrentMux(t *testing.T) {
-	sm := swappableMux{}
-	mux := sm.get()
-	if !reflect.DeepEqual(mux, sm.root) {
-		t.Errorf("Returned mux is not the same %#v", mux)
-	}
-}
-
-func TestSwappableMuxGetReturnsADifferentInstance(t *testing.T) {
-	sm := swappableMux{}
-	mux := sm.get()
-	if &mux == &sm.root {
-		t.Error("Returned mux is the same instance")
-	}
-}
-
-func TestSwappableMuxGetWaitsForTheMutexToBeReleased(t *testing.T) {
-	sm := swappableMux{}
-
-	sm.m.Lock()
-	defer sm.m.Unlock()
-
-	c := make(chan mux.Router)
-	go func() { c <- sm.get() }()
-
-	time.Sleep(10 * time.Millisecond)
-
-	select {
-	case <-c:
-		t.Error("Didn't acquire the mutex")
-	default:
-	}
-}
-
-func TestSwappableMuxGetIsAbleToReadWhileOthersAreReading(t *testing.T) {
-	sm := swappableMux{}
-
-	sm.m.RLock()
-	defer sm.m.RUnlock()
-
-	c := make(chan mux.Router)
-	go func() { c <- sm.get() }()
-
-	time.Sleep(10 * time.Millisecond)
-
-	select {
-	case <-c:
-	default:
-		t.Error("The mutex cannot be acquired")
-	}
-}
-
-func TestSwappableMuxSetSetsTheGivenMux(t *testing.T) {
-	sm := swappableMux{}
-	mux := mux.Router{
-		KeepContext: true,
-	}
-
-	sm.set(mux)
-
-	if !sm.root.KeepContext {
-		t.Error("mux not set")
-	}
-}
-
-func TestSwappableMuxSetSetsADifferentInstance(t *testing.T) {
-	sm := swappableMux{}
-	mux := mux.Router{}
-
-	sm.set(mux)
-
-	if &mux == &sm.root {
-		t.Error("Set mux is the same instance")
-	}
-}
-
-func TestSwappableMuxSetWaitsForWriterToReleaseMutex(t *testing.T) {
-	sm := swappableMux{}
-
-	sm.m.Lock()
-	defer sm.m.Unlock()
-
-	c := make(chan bool)
-	go func() { sm.set(mux.Router{}); c <- true }()
-
-	time.Sleep(10 * time.Millisecond)
-
-	select {
-	case <-c:
-		t.Error("Didn't acquire the mutex")
-	default:
-	}
-}
-
-func TestSwappableMuxSetWaitsForReadersToReleaseMutex(t *testing.T) {
-	sm := swappableMux{}
-
-	sm.m.RLock()
-	defer sm.m.RUnlock()
-
-	c := make(chan bool)
-	go func() { sm.set(mux.Router{}); c <- true }()
-
-	time.Sleep(10 * time.Millisecond)
-
-	select {
-	case <-c:
-		t.Error("Didn't acquire the mutex")
-	default:
-	}
-}