package topdata

import (
	"os"
	"path/filepath"
	"testing"
)

func TestHasLFSPointerStubsDetectsStub(t *testing.T) {
	root := t.TempDir()
	if err := os.MkdirAll(filepath.Join(root, "a"), 0o755); err != nil {
		t.Fatalf("mkdir: %v", err)
	}
	stub := "version https://git-lfs.github.com/spec/v1\noid sha256:abc\nsize 12345\n"
	writeFile(t, filepath.Join(root, "a", "model.mdl"), stub)
	writeFile(t, filepath.Join(root, "a", "real.txt"), "not a pointer, real bytes here")

	if !hasLFSPointerStubs(root) {
		t.Fatal("expected stub detection to be true")
	}
}

func TestHasLFSPointerStubsNoStub(t *testing.T) {
	root := t.TempDir()
	writeFile(t, filepath.Join(root, "real.mdl"), "binary-ish content without a pointer header")
	if hasLFSPointerStubs(root) {
		t.Fatal("expected no stub detected")
	}
}