1 files changed, 55 insertions, 0 deletions
diff --git a/gui/internal/model/plan_test.go b/gui/internal/model/plan_test.go
index a54768c..0aa0361 100644
--- a/gui/internal/model/plan_test.go
+++ b/gui/internal/model/plan_test.go
@@ -408,3 +408,58 @@ func TestAgeText(t *testing.T) {
 		t.Errorf("a file from the future = %q, want 0m", got)
 	}
 }
+
+// TestKeepThisCopy: choosing the downloaded copy over the filed one puts it
+// in the other's place and sends the other to the Trash, where undo can
+// still reach it (his request, 2026-09-17).
+func TestKeepThisCopy(t *testing.T) {
+	conf := "(path \"~/dl\")\n(rule \"dupes\" (when (duplicate \"~/docs\")) (move \"Dupes\"))\n"
+	e, h := sandboxDir(t, conf, map[string]string{"report.pdf": "the same bytes"})
+	filed := filepath.Join(h, "docs", "work", "report.pdf")
+	if err := os.MkdirAll(filepath.Dir(filed), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filed, []byte("the same bytes"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	tab := planTab(t, e)
+	if len(tab.Rows) != 1 || tab.Rows[0].DuplicateOf != filed {
+		t.Fatalf("row = %+v, want it a duplicate of %s", tab.Rows[0], filed)
+	}
+	if err := tab.KeepThisCopy(0); err != nil {
+		t.Fatal(err)
+	}
+	step := tab.Rows[0].Steps[0]
+	if step.Kind != plan.Move || step.Dst != filed || step.Displaces != filed {
+		t.Fatalf("step = %+v", step)
+	}
+	if _, err := tab.Apply(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	// The download is now the filed copy, with its own bytes.
+	if body, err := os.ReadFile(filed); err != nil || string(body) != "the same bytes" {
+		t.Errorf("the kept copy is not in place: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(h, "dl", "report.pdf")); !os.IsNotExist(err) {
+		t.Errorf("the download is still where it was: %v", err)
+	}
+	// The copy it replaced went to the Trash, not to oblivion.
+	entries, _ := os.ReadDir(filepath.Join(h, ".local", "share", "Trash", "files"))
+	if len(entries) != 1 {
+		t.Errorf("the Trash holds %d files, want the replaced one", len(entries))
+	}
+}
+
+// TestKeepThisCopyRefusesANonDuplicate: the choice only means something for
+// a file krino found another copy of.
+func TestKeepThisCopyRefusesANonDuplicate(t *testing.T) {
+	conf := "(path \"~/dl\")\n(rule \"all\" (move \"Out\"))\n"
+	e, _ := sandboxDir(t, conf, map[string]string{"a.pdf": "one"})
+	tab := planTab(t, e)
+	if err := tab.KeepThisCopy(0); err == nil {
+		t.Error("a file that duplicates nothing was accepted")
+	}
+	if err := tab.KeepThisCopy(9); err == nil {
+		t.Error("a row that does not exist was accepted")
+	}
+}