diff --git a/cmd/serve_test.go b/cmd/serve_test.go
new file mode 100644
index 0000000..6a3da47
--- /dev/null
+++ b/cmd/serve_test.go
@@ -0,0 +1,184 @@
+package cmd
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"sort"
+	"testing"
+
+	"github.com/gorilla/mux"
+)
+
+func setupTest(t *testing.T) (string, func()) {
+	tempDir := t.TempDir()
+	oldDir := serveDirectory
+	serveDirectory = tempDir
+
+	return tempDir, func() {
+		serveDirectory = oldDir
+	}
+}
+
+func TestUploadHandler_Success(t *testing.T) {
+	tempDir, cleanup := setupTest(t)
+	defer cleanup()
+
+	r := mux.NewRouter()
+	r.HandleFunc("/backup/{filename}", uploadHandler).Methods("POST")
+
+	body := bytes.NewBufferString("test data")
+	req := httptest.NewRequest("POST", "/backup/testfile", body)
+	req = mux.SetURLVars(req, map[string]string{"filename": "testfile"})
+
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", w.Code)
+	}
+
+	filePath := filepath.Join(tempDir, "testfile")
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		t.Fatal("File not created:", err)
+	}
+
+	if string(data) != "test data" {
+		t.Errorf("Expected 'test data', got '%s'", string(data))
+	}
+}
+
+func TestUploadHandler_CreateFileError(t *testing.T) {
+	_, cleanup := setupTest(t)
+	defer cleanup()
+
+	// Создаем директорию без прав на запись
+	serveDirectory = "/proc/invalid_path"
+
+	r := mux.NewRouter()
+	r.HandleFunc("/backup/{filename}", uploadHandler).Methods("POST")
+
+	body := bytes.NewBufferString("test")
+	req := httptest.NewRequest("POST", "/backup/testfile", body)
+	req = mux.SetURLVars(req, map[string]string{"filename": "testfile"})
+
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusInternalServerError {
+		t.Errorf("Expected status 500, got %d", w.Code)
+	}
+}
+
+func TestDownloadHandler_Success(t *testing.T) {
+	tempDir, cleanup := setupTest(t)
+	defer cleanup()
+
+	// Создаем тестовый файл
+	filePath := filepath.Join(tempDir, "testfile")
+	if err := os.WriteFile(filePath, []byte("test data"), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	r := mux.NewRouter()
+	r.HandleFunc("/backup/{filename}", downloadHandler).Methods("GET")
+
+	req := httptest.NewRequest("GET", "/backup/testfile", nil)
+	req = mux.SetURLVars(req, map[string]string{"filename": "testfile"})
+
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", w.Code)
+	}
+
+	if body := w.Body.String(); body != "test data" {
+		t.Errorf("Expected 'test data', got '%s'", body)
+	}
+}
+
+func TestDownloadHandler_NotFound(t *testing.T) {
+	_, cleanup := setupTest(t)
+	defer cleanup()
+
+	r := mux.NewRouter()
+	r.HandleFunc("/backup/{filename}", downloadHandler).Methods("GET")
+
+	req := httptest.NewRequest("GET", "/backup/missing", nil)
+	req = mux.SetURLVars(req, map[string]string{"filename": "missing"})
+
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusNotFound {
+		t.Errorf("Expected status 404, got %d", w.Code)
+	}
+}
+
+func TestListHandler_Success(t *testing.T) {
+	tempDir, cleanup := setupTest(t)
+	defer cleanup()
+
+	// Создаем тестовые файлы
+	files := []string{"file1.txt", "file2.txt"}
+	for _, f := range files {
+		path := filepath.Join(tempDir, f)
+		if err := os.WriteFile(path, []byte("data"), 0644); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	r := mux.NewRouter()
+	r.HandleFunc("/backup", listHandler).Methods("GET")
+
+	req := httptest.NewRequest("GET", "/backup", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("Expected status 200, got %d", w.Code)
+	}
+
+	var result []string
+	if err := json.Unmarshal(w.Body.Bytes(), &result); err != nil {
+		t.Fatal("Failed to parse JSON:", err)
+	}
+
+	sort.Strings(result)
+	expected := []string{"file1.txt", "file2.txt"}
+	sort.Strings(expected)
+
+	if len(result) != len(expected) {
+		t.Fatalf("Expected %d files, got %d", len(expected), len(result))
+	}
+
+	for i := range expected {
+		if expected[i] != result[i] {
+			t.Errorf("Expected %s, got %s", expected[i], result[i])
+		}
+	}
+}
+
+func TestListHandler_ReadDirError(t *testing.T) {
+	tempDir, cleanup := setupTest(t)
+	defer cleanup()
+
+	// Удаляем директорию чтобы вызвать ошибку
+	os.RemoveAll(tempDir)
+
+	r := mux.NewRouter()
+	r.HandleFunc("/backup", listHandler).Methods("GET")
+
+	req := httptest.NewRequest("GET", "/backup", nil)
+	w := httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+
+	if w.Code != http.StatusInternalServerError {
+		t.Errorf("Expected status 500, got %d", w.Code)
+	}
+}