diff --git a/api/router_mock_test.go b/api/router_mock_test.go
new file mode 100644
index 00000000..3c84921d
--- /dev/null
+++ b/api/router_mock_test.go
@@ -0,0 +1,377 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"github.com/stretchr/testify/require"
+)
+
+type centerMock struct {
+}
+
+func (c *centerMock) Authenticate(*http.Request) (*auth.Box, error) {
+	return &auth.Box{}, nil
+}
+
+type handlerMock struct {
+	t *testing.T
+}
+
+type handlerResult struct {
+	Method  string
+	ReqInfo *middleware.ReqInfo
+}
+
+func (h *handlerMock) HeadObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteObjectTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) SelectObjectContentHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectRetentionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectLegalHoldHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetObjectAttributesHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) CopyObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectRetentionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectLegalHoldHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
+	res := &handlerResult{
+		Method:  "PutObject",
+		ReqInfo: middleware.GetReqInfo(r.Context()),
+	}
+
+	h.writeResponse(w, res)
+}
+
+func (h *handlerMock) DeleteObjectHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketLocationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketPolicyHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketLifecycleHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketEncryptionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketACLHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketCorsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketCorsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketCorsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketWebsiteHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketAccelerateHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketRequestPaymentHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketLoggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketReplicationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketWebsiteHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketObjectLockConfigHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketVersioningHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) GetBucketNotificationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListenBucketNotificationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListObjectsV2MHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListObjectsV2Handler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListBucketObjectVersionsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListObjectsV1Handler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketLifecycleHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketEncryptionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketPolicyHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketObjectLockConfigHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketTaggingHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketVersioningHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PutBucketNotificationHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) CreateBucketHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) HeadBucketHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) PostObject(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteMultipleObjectsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketPolicyHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketLifecycleHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketEncryptionHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) DeleteBucketHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListBucketsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) Preflight(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) AppendCORSHeaders(http.ResponseWriter, *http.Request) {
+}
+
+func (h *handlerMock) CreateMultipartUploadHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) UploadPartHandler(w http.ResponseWriter, r *http.Request) {
+	res := &handlerResult{
+		Method:  "UploadPart",
+		ReqInfo: middleware.GetReqInfo(r.Context()),
+	}
+
+	h.writeResponse(w, res)
+}
+
+func (h *handlerMock) UploadPartCopy(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) CompleteMultipartUploadHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) AbortMultipartUploadHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListPartsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ListMultipartUploadsHandler(http.ResponseWriter, *http.Request) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (h *handlerMock) ResolveBucket(context.Context, string) (*data.BucketInfo, error) {
+	return &data.BucketInfo{}, nil
+}
+
+func (h *handlerMock) writeResponse(w http.ResponseWriter, resp *handlerResult) {
+	respData, err := json.Marshal(resp)
+	require.NoError(h.t, err)
+
+	_, err = w.Write(respData)
+	require.NoError(h.t, err)
+}
diff --git a/api/router_test.go b/api/router_test.go
new file mode 100644
index 00000000..e63007e0
--- /dev/null
+++ b/api/router_test.go
@@ -0,0 +1,75 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap/zaptest"
+)
+
+func TestRouterUploadPart(t *testing.T) {
+	chiRouter := prepareRouter(t)
+
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest(http.MethodPut, "/dkirillov/fix-object", nil)
+	query := make(url.Values)
+	query.Set("uploadId", "some-id")
+	query.Set("partNumber", "1")
+	r.URL.RawQuery = query.Encode()
+
+	chiRouter.ServeHTTP(w, r)
+	resp := readResponse(t, w)
+	require.Equal(t, "UploadPart", resp.Method)
+}
+
+func TestRouterObjectWithSlashes(t *testing.T) {
+	chiRouter := prepareRouter(t)
+
+	bktName, objName := "dkirillov", "/fix/object"
+	target := fmt.Sprintf("/%s/%s", bktName, objName)
+
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest(http.MethodPut, target, nil)
+
+	chiRouter.ServeHTTP(w, r)
+	resp := readResponse(t, w)
+	require.Equal(t, "PutObject", resp.Method)
+	require.Equal(t, objName, resp.ReqInfo.ObjectName)
+}
+
+func prepareRouter(t *testing.T) *chi.Mux {
+	throttleOps := middleware.ThrottleOpts{
+		Limit:          10,
+		BacklogTimeout: 30 * time.Second,
+	}
+
+	handleMock := &handlerMock{t: t}
+	cntrMock := &centerMock{}
+	log := zaptest.NewLogger(t)
+	metric := &metrics.AppMetrics{}
+
+	chiRouter := chi.NewRouter()
+	AttachChi(chiRouter, nil, throttleOps, handleMock, cntrMock, log, metric)
+	return chiRouter
+}
+
+func readResponse(t *testing.T, w *httptest.ResponseRecorder) handlerResult {
+	var res handlerResult
+
+	resData, err := io.ReadAll(w.Result().Body)
+	require.NoError(t, err)
+
+	err = json.Unmarshal(resData, &res)
+	require.NoErrorf(t, err, "actual body: '%s'", string(resData))
+	return res
+}