diff --git a/src/functional/test.h b/src/functional/test.h
deleted file mode 100644
index fb0a7ae..0000000
--- a/src/functional/test.h
+++ /dev/null
@@ -1,33 +0,0 @@
-#include <stdio.h>
-#include <stdarg.h>
-#include <unistd.h>
-
-/* TODO: not thread-safe nor fork-safe */
-static volatile int test_status;
-
-#define TEST_LOC2(l) __FILE__ ":" #l
-#define TEST_LOC1(l) TEST_LOC2(l)
-#define error(...) test_printf("ERROR " TEST_LOC1(__LINE__) ": " __VA_ARGS__)
-
-static int test_printf(const char *s, ...)
-{
-	va_list ap;
-	char buf[512];
-	int n;
-
-	test_status = 1;
-	va_start(ap, s);
-	n = vsnprintf(buf, sizeof buf, s, ap);
-	va_end(ap);
-	if (n < 0)
-		n = 0;
-	else if (n >= sizeof buf) {
-		n = sizeof buf;
-		buf[n - 1] = '\n';
-		buf[n - 2] = '.';
-		buf[n - 3] = '.';
-		buf[n - 4] = '.';
-	}
-	return write(1, buf, n);
-}
-