diff --git a/pkg/filesystem/image_test.go b/pkg/filesystem/image_test.go
index 0c4d0261..9678df92 100644
--- a/pkg/filesystem/image_test.go
+++ b/pkg/filesystem/image_test.go
@@ -38,3 +38,12 @@ func TestFileSystem_GetThumb(t *testing.T) {
 		asserts.EqualValues(50, res.MaxAge)
 	}
 }
+
+func TestFileSystem_ThumbWorker(t *testing.T) {
+	asserts := assert.New(t)
+
+	asserts.NotPanics(func() {
+		getThumbWorker().addWorker()
+		getThumbWorker().releaseWorker()
+	})
+}
diff --git a/pkg/thumb/image_test.go b/pkg/thumb/image_test.go
index 7fe65a18..210a39a4 100644
--- a/pkg/thumb/image_test.go
+++ b/pkg/thumb/image_test.go
@@ -86,6 +86,30 @@ func TestThumb_GetThumb(t *testing.T) {
 	})
 }
 
+func TestThumb_Thumbnail(t *testing.T) {
+	asserts := assert.New(t)
+	{
+		img := image.NewRGBA(image.Rect(0, 0, 500, 200))
+		thumb := Thumbnail(100, 100, img)
+		asserts.Equal(thumb.Bounds(), image.Rect(0, 0, 100, 40))
+	}
+	{
+		img := image.NewRGBA(image.Rect(0, 0, 200, 200))
+		thumb := Thumbnail(100, 100, img)
+		asserts.Equal(thumb.Bounds(), image.Rect(0, 0, 100, 100))
+	}
+	{
+		img := image.NewRGBA(image.Rect(0, 0, 500, 500))
+		thumb := Thumbnail(100, 100, img)
+		asserts.Equal(thumb.Bounds(), image.Rect(0, 0, 100, 100))
+	}
+	{
+		img := image.NewRGBA(image.Rect(0, 0, 200, 500))
+		thumb := Thumbnail(100, 100, img)
+		asserts.Equal(thumb.Bounds(), image.Rect(0, 0, 40, 100))
+	}
+}
+
 func TestThumb_Save(t *testing.T) {
 	asserts := assert.New(t)
 	file := CreateTestImage()