Utility function to delete content of dir pointed to by open file

tools/utils/rmtree_test.go

@@ -0,0 +1,52 @@
+package utils
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestRemoveChildren(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	// Create nested structure
+	subDir := filepath.Join(tmpDir, "subdir")
+	os.Mkdir(subDir, 0755)
+	os.WriteFile(filepath.Join(tmpDir, "file1.txt"), []byte("data"), 0644)
+	os.WriteFile(filepath.Join(subDir, "file2.txt"), []byte("data"), 0644)
+
+	d, err := os.Open(tmpDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer d.Close()
+
+	if err := RemoveChildren(d); err != nil {
+		t.Errorf("expected no error, got %v", err)
+	}
+
+	// Verify directory is empty
+	entries, _ := os.ReadDir(tmpDir)
+	if len(entries) != 0 {
+		t.Errorf("expected 0 entries, got %d", len(entries))
+	}
+}
+
+func TestRemoveChildren_FirstError(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	// Create a read-only file to trigger an error on some systems
+	// (Note: Behavior varies by OS; this is a conceptual test for firstErr)
+	lockedFile := filepath.Join(tmpDir, "locked")
+	os.WriteFile(lockedFile, nil, 0000)
+
+	d, _ := os.Open(tmpDir)
+	defer d.Close()
+
+	err := RemoveChildren(d)
+	if err != nil {
+		if _, ok := err.(*os.PathError); !ok {
+			t.Errorf("expected *os.PathError, got %T", err)
+		}
+	}
+}