A simple test infrastructure -- idea stolen from Gaurav.

src/platform/vboot_reference/cgptlib/tests/cgpt_test.h

+/* Copyright (c) 2010 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.
+ */
+#ifndef VBOOT_REFERENCE_CGPTLIB_TESTS_CGPT_TEST_H_
+#define VBOOT_REFERENCE_CGPTLIB_TESTS_CGPT_TEST_H_
+
+#include <stdio.h>
+
+#define TEST_FAIL -1
+
+/* ANSI Color coding sequences. */
+#define COL_GREEN "\e[1;32m"
+#define COL_RED "\e[0;31m"
+#define COL_STOP "\e[m"
+
+#define EXPECT(expr) \
+  if (!expr) { \
+    printf(COL_RED " fail " COL_STOP "in expression %s in %s() line %d\n",\
+           #expr, __FUNCTION__, __LINE__); \
+    return TEST_FAIL; \
+  }
+
+#endif  /* VBOOT_REFERENCE_CGPTLIB_TESTS_CGPT_TEST_H_ */