Add unit test for tempfile()

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

tempfile.c

@@ -1,6 +1,6 @@
 /* A secure tmpfile() replacement.
  *
- * Copyright (c) 2015  Joachim Nilsson <troglobit@gmail.com>
+ * Copyright (c) 2015-2016  Joachim Nilsson <troglobit@gmail.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -51,17 +51,8 @@ FILE *tempfile(void)
 #endif
 }
 
-#ifdef UNITTEST
-int main(void)
-{
-	FILE *fp = tempfile(); system("ls -lrt "
-	_PATH_TMP " | tail -10"); return fclose(fp);
-}
-#endif
-
 /**
  * Local Variables:
- *  compile-command: "make V=1 -f tempfile.mk"
  *  indent-tabs-mode: t
  *  c-file-style: "linux"
  * End:

tempfile.mk

@@ -1,4 +0,0 @@
-OBJS        = 
-TARGET      = tempfile.test clean
-
-include rules.mk

tests/Makefile.am

@@ -4,10 +4,12 @@ CLEANFILES      = *~ *.trs *.log
 TESTS           =
 TESTS          += makepath
 TESTS          += pidfile
+TESTS          += tempfile
 TESTS          += tree
 
 check_PROGRAMS  = $(TESTS)
 
 # Ignore warnings about unused result, in e.g. write()
 CFLAGS          = -W -Wall -Wextra -Wno-unused-result
+CPPFLAGS        = -D_GNU_SOURCE
 LDADD           = -L../ ../libite.la

tests/tempfile.c

@@ -0,0 +1,25 @@
+#include <fcntl.h>		/* O_TMPFILE requires -D_GNU_SOURCE */
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "check.h"
+
+#ifndef  O_TMPFILE
+#warning O_TMPFILE is missing, either too old GLIBC, Linux, or non-Linux system
+#endif
+
+int main(void)
+{
+	FILE *fp;
+
+	printf("Before tempfile():\n");
+	system("ls -lrt " _PATH_TMP " | tail -3");
+
+	fp = tempfile();
+	fail_unless(fp != NULL);
+
+	printf("\nAfter tempfile(), should be same list:\n");
+	system("ls -lrt " _PATH_TMP " | tail -3");
+
+	return fclose(fp);
+}