diff --git a/testdata/ffmpeg.d/cmd/prune/main_test.go b/testdata/ffmpeg.d/cmd/prune/main_test.go
index 911696f..431b0bb 100644
--- a/testdata/ffmpeg.d/cmd/prune/main_test.go
+++ b/testdata/ffmpeg.d/cmd/prune/main_test.go
@@ -2,11 +2,49 @@ package main
 
 import (
 	"context"
+	"os"
+	"path"
 	"testing"
 )
 
 func TestRun(t *testing.T) {
-	if err := Run(context.Background(), []string{}); err != nil {
+	d := path.Join(t.TempDir(), "record")
+	if err := os.MkdirAll(d, os.ModePerm); err != nil {
 		t.Fatal(err)
 	}
+	if a, err := os.ReadFile(path.Join("testdata", "a.jpg")); err != nil {
+		t.Fatal(err)
+	} else if b, err := os.ReadFile(path.Join("testdata", "b.jpg")); err != nil {
+		t.Fatal(err)
+	} else if err := os.WriteFile(path.Join(d, "series.0.jpg"), a, os.ModePerm); err != nil {
+		t.Fatal(err)
+	} else if err := os.WriteFile(path.Join(d, "series.1.jpg"), a, os.ModePerm); err != nil {
+		t.Fatal(err)
+	} else if err := os.WriteFile(path.Join(d, "series.2.jpg"), b, os.ModePerm); err != nil {
+		t.Fatal(err)
+	} else if err := os.WriteFile(path.Join(d, "series.3.jpg"), b, os.ModePerm); err != nil {
+		t.Fatal(err)
+	} else if err := os.WriteFile(path.Join(d, "zlast.0.jpg"), b, os.ModePerm); err != nil {
+		t.Fatal(err)
+	}
+
+	t.Log("lsd", path.Dir(d))
+	t.Log(lsd(path.Dir(d)))
+
+	t.Log("lsf", d)
+	t.Log(lsf(d))
+
+	if err := Run(context.Background(), []string{path.Dir(d)}); err != nil {
+		t.Fatal(err)
+	}
+
+	if results, err := lsf(path.Join(path.Dir(d), "movement")); err != nil {
+		t.Fatal(err)
+	} else if len(results) < 2 {
+		t.Fatal(results)
+	} else if path.Base(results[0]) != "series.1.jpg" {
+		t.Fatal(results)
+	} else if path.Base(results[1]) != "series.2.jpg" {
+		t.Fatal(results)
+	}
 }