v3 candidate

internal/leviathan/binsnoop/common_test.go

@@ -0,0 +1,22 @@
+package binsnoop
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestReadFileLimitedRejectsOversizedFile(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "firmware.bin")
+	if err := os.WriteFile(path, []byte("abcd"), 0600); err != nil {
+		t.Fatalf("WriteFile() failed: %v", err)
+	}
+	_, err := ReadFileLimited(path, 3)
+	if err == nil {
+		t.Fatal("expected oversized file to be rejected")
+	}
+	if !strings.Contains(err.Error(), "file is too large") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}