//go:build linux

package assetcache

import (
	"path/filepath"
	"testing"
)

// TestStatfsReportsTheTempDir is the acceptance test for the real FS: it asks
// the kernel about a real directory.
func TestStatfsReportsTheTempDir(t *testing.T) {
	total, free, err := Statfs.Space(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	if total == 0 {
		t.Fatal("total = 0, want the filesystem's size")
	}
	if free > total {
		t.Fatalf("free %d > total %d", free, total)
	}
}

// TestStatfsFailsOnAMissingDirectory asks the kernel about a directory that
// does not exist: the real FS returns the error and no totals.
func TestStatfsFailsOnAMissingDirectory(t *testing.T) {
	total, free, err := Statfs.Space(filepath.Join(t.TempDir(), "missing"))
	if err == nil {
		t.Fatal("Space of a missing directory succeeded")
	}
	if total != 0 || free != 0 {
		t.Fatalf("Space of a missing directory = %d, %d, want 0, 0 with the error", total, free)
	}
}