t.Fatal(err)
	}
	mounts, err := readProcMounts(mountsPath)
	if err != nil {
		t.Fatal(err)
	}
	// Failure case where we detected successfully cross device mounts.
	{
		if err = mounts.checkCrossMounts("/path/to/1"); err == nil {
			t.Fatal("Expected to fail, but found success")
		}

		mp := []mountInfo{
			{"/dev/2", "/path/to/1/2", "type2", []string{"flags"}, "2", "2"},
		}