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diff --git a/test_util.h b/test_util.h
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+/* test_util.h
+ * Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Utility functions in testing.
+ */
+
+#ifndef _TEST_UTIL_H_
+#define _TEST_UTIL_H_
+
+#include <stdio.h>
+
+#include <memory>
+#include <string>
+
+#include "config_parser.h"
+
+namespace mj {
+
+namespace internal {
+
+// Functor for |ScopedFILE| (below).
+struct ScopedFILECloser {
+  inline void operator()(FILE *x) const {
+    if (x) {
+      fclose(x);
+    }
+  }
+};
+
+// Functor for |ScopedConfigEntry| (below).
+struct ScopedConfigEntryDeleter {
+  inline void operator()(config_entry *entry) const {
+    if (entry) {
+      free(entry);
+    }
+  }
+};
+
+} // namespace internal
+
+} // namespace mj
+
+using ScopedFILE = std::unique_ptr<FILE, mj::internal::ScopedFILECloser>;
+using ScopedConfigEntry =
+    std::unique_ptr<config_entry, mj::internal::ScopedConfigEntryDeleter>;
+
+/*
+ * write_to_pipe: write a string as the file content into a pipe based
+ * file handle. This is particularly useful when testing with temporary data
+ * files, without dealing with complexities such as relative file path, file
+ * permission and etc. However, a pipe has limited capacity so write_to_pipe
+ * will hang when a big enough string is written. This is for use in testing
+ * only.
+ *
+ * Returns a FILE* that contains @content.
+ */
+
+FILE *write_to_pipe(const std::string& content);
+
+/*
+ * source_path: return the path to a test fixture located in the current
+ * source tree. This uses the `SRC` environment variable as the root of the
+ * tree, falling back to the current directory.
+ */
+std::string source_path(const std::string& file);
+
+#endif /* _TEST_UTIL_H_ */