tests: Add lib/cbfs-verification-test test case

This commit adds test case for lib/cbfs verification mechanisms.

Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: I1d8cbb1c2d0a9db3236de065428b70a9c2a66330
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56601
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

tests/stubs/die.c

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <tests/test.h>
+
+void die(const char *msg, ...)
+{
+	/* die() can be called in middle a function, so we should not allow for it to return */
+	static char msg_buf[256];
+	va_list v;
+	va_start(v, msg);
+	vsnprintf(msg_buf, ARRAY_SIZE(msg_buf), msg, v);
+	va_end(v);
+	fail_msg("%s", msg_buf);
+}