diff --git a/internal/api/thumbnails_test.go b/internal/api/thumbnails_test.go
new file mode 100644
index 000000000..d8ac8b137
--- /dev/null
+++ b/internal/api/thumbnails_test.go
@@ -0,0 +1,58 @@
+package api
+
+import (
+	"github.com/stretchr/testify/assert"
+	"net/http"
+	"testing"
+)
+
+func TestGetThumbnail(t *testing.T) {
+	t.Run("invalid type", func(t *testing.T) {
+		app, router, ctx := NewApiTest()
+		GetThumbnail(router, ctx)
+		result := PerformRequest(app, "GET", "/api/v1/thumbnails/1/xxx")
+
+		assert.Equal(t, http.StatusBadRequest, result.Code)
+	})
+	t.Run("invalid hash", func(t *testing.T) {
+		app, router, ctx := NewApiTest()
+		GetThumbnail(router, ctx)
+		result := PerformRequest(app, "GET", "/api/v1/thumbnails/1/tile_500")
+
+		assert.Equal(t, http.StatusNotFound, result.Code)
+	})
+}
+
+func TestLabelThumbnail(t *testing.T) {
+	t.Run("invalid type", func(t *testing.T) {
+		app, router, ctx := NewApiTest()
+		LabelThumbnail(router, ctx)
+		result := PerformRequest(app, "GET", "/api/v1/labels/dog/thumbnail/xxx")
+
+		assert.Equal(t, http.StatusBadRequest, result.Code)
+	})
+	t.Run("invalid label", func(t *testing.T) {
+		app, router, ctx := NewApiTest()
+		LabelThumbnail(router, ctx)
+		result := PerformRequest(app, "GET", "/api/v1/labels/xxx/thumbnail/tile_500")
+
+		assert.Equal(t, http.StatusNotFound, result.Code)
+	})
+}
+
+func TestAlbumThumbnail(t *testing.T) {
+	t.Run("invalid type", func(t *testing.T) {
+		app, router, ctx := NewApiTest()
+		AlbumThumbnail(router, ctx)
+		result := PerformRequest(app, "GET", "/api/v1/albums/1/thumbnail/xxx")
+
+		assert.Equal(t, http.StatusBadRequest, result.Code)
+	})
+	t.Run("album has no photo (because is not existing)", func(t *testing.T) {
+		app, router, ctx := NewApiTest()
+		AlbumThumbnail(router, ctx)
+		result := PerformRequest(app, "GET", "/api/v1/albums/987-986435/thumbnail/tile_500")
+
+		assert.Equal(t, http.StatusOK, result.Code)
+	})
+}