Simple unit-tests for libcrypt, to show how easy it is.

Approved by:	marcel (mentor)

lib/libcrypt/tests/Makefile

@@ -0,0 +1,10 @@
+# $FreeBSD$
+
+# exercise libcrypt
+
+TESTS_C= crypt_tests
+
+CFLAGS+= -I${.CURDIR:H}
+LDADD+= -L${.OBJDIR:H} -lcrypt
+
+.include <atf.test.mk>

lib/libcrypt/tests/crypt_tests.c

@@ -0,0 +1,54 @@
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <crypt.h>
+#include <unistd.h>
+
+#include <atf-c.h>
+
+#define	LEET "0.s0.l33t"
+
+ATF_TC(md5);
+ATF_TC_HEAD(md5, tc)
+{
+
+	atf_tc_set_md_var(tc, "descr", "Tests the MD5 based password hash");
+}
+
+ATF_TC_BODY(md5, tc)
+{
+	const char want[] = "$1$deadbeef$0Huu6KHrKLVWfqa4WljDE0";
+	char *pw;
+
+	pw = crypt(LEET, want);
+	ATF_CHECK_STREQ(pw, want);
+}
+
+ATF_TC(invalid);
+ATF_TC_HEAD(invalid, tc)
+{
+
+	atf_tc_set_md_var(tc, "descr", "Tests that invalid password fails");
+}
+
+ATF_TC_BODY(invalid, tc)
+{
+	const char want[] = "$1$cafebabe$0Huu6KHrKLVWfqa4WljDE0";
+	char *pw;
+
+	pw = crypt(LEET, want);
+	ATF_CHECK(strcmp(pw, want) != 0);
+}
+
+/*
+ * This function must not do anything except enumerate
+ * the test cases, else atf-run is likely to be upset.
+ */
+ATF_TP_ADD_TCS(tp)
+{
+
+	ATF_TP_ADD_TC(tp, md5);
+	ATF_TP_ADD_TC(tp, invalid);
+	return atf_no_error();
+}