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diff --git a/tests/tap/files.h b/tests/tap/files.h
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+/*  Copyright (C) 2016 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+
+/*!
+ * \brief Create a temporary file.
+ *
+ * If TMPDIR environment variable is set, the file is created within
+ * that directory. If the variable is not set, the file is created
+ * within /tmp.
+ */
+char *test_mktemp(void);
+
+/*!
+ * \brief Create a temporary directory.
+ *
+ * If TMPDIR environment variable is set, the directory is created within
+ * that directory. If the variable is not set, the directory is created
+ * within /tmp.
+ */
+char *test_mkdtemp(void);
+
+/*!
+ * \brief Delete file or directory (recursive).
+ *
+ * \return true on success, false when one or more files failed to be removed.
+ */
+bool test_rm_rf(const char *path);