1 files changed, 76 insertions, 1 deletions
diff --git a/sumtimeval.c b/sumtimeval.c
index 409500d..b4e80bb 100644
--- a/sumtimeval.c
+++ b/sumtimeval.c
@@ -1,9 +1,10 @@
 /* See LICENSE file for copyright and license details. */
 #include "libsimple.h"
+#ifndef TEST
 
 
 int
-libsimple_sumtimeval(struct timeval *sum, const struct timeval *augend, const struct timeval *addend) /* TODO test */
+libsimple_sumtimeval(struct timeval *sum, const struct timeval *augend, const struct timeval *addend)
 {
 	struct timespec a, b, s;
 	int r;
@@ -14,3 +15,77 @@ libsimple_sumtimeval(struct timeval *sum, const struct timeval *augend, const st
 		return r;
 	return r | libsimple_timespec2timeval(sum, &s);
 }
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	struct timeval r, a, b;
+
+	a.tv_sec = 0, a.tv_usec = 0;
+	b.tv_sec = 0, b.tv_usec = 0;
+	assert(!libsimple_sumtimeval(&r, &a, &b));
+	assert(r.tv_sec  == 0);
+	assert(r.tv_usec == 0);
+
+	a.tv_sec = 10, a.tv_usec = 10000L;
+	b.tv_sec =  0, b.tv_usec =     0L;
+	assert(!libsimple_sumtimeval(&r, &a, &b));
+	assert(r.tv_sec  == 10);
+	assert(r.tv_usec == 10000L);
+
+	a.tv_sec =  10, a.tv_usec = 10000L;
+	b.tv_sec = -10, b.tv_usec =     0L;
+	assert(!libsimple_sumtimeval(&r, &a, &b));
+	assert(r.tv_sec  == 0);
+	assert(r.tv_usec == 10000L);
+
+	a.tv_sec =  10, a.tv_usec = 10000L;
+	b.tv_sec = -20, b.tv_usec = 20000L;
+	assert(!libsimple_sumtimeval(&r, &a, &b));
+	assert(r.tv_sec  == -10);
+	assert(r.tv_usec == 30000L);
+
+	a.tv_sec = 1, a.tv_usec = 999999L;
+	b.tv_sec = 1, b.tv_usec =      1L;
+	assert(!libsimple_sumtimeval(&r, &a, &b));
+	assert(r.tv_sec  == 3);
+	assert(r.tv_usec == 0L);
+
+	a.tv_sec = TIME_MAX, a.tv_usec = 0L;
+	b.tv_sec = TIME_MAX, b.tv_usec = 0L;
+	assert(libsimple_sumtimeval(&r, &a, &b) == -1);
+	assert(r.tv_sec  == TIME_MAX);
+	assert(r.tv_usec == 999999L);
+
+	a.tv_sec = TIME_MAX, a.tv_usec = 999999L;
+	b.tv_sec =        0, b.tv_usec =      1L;
+	assert(libsimple_sumtimeval(&r, &a, &b) == -1);
+	assert(r.tv_sec  == TIME_MAX);
+	assert(r.tv_usec == 999999L);
+
+	a.tv_sec = TIME_MAX, a.tv_usec =      1L;
+	b.tv_sec =        0, b.tv_usec = 999999L;
+	assert(libsimple_sumtimeval(&r, &a, &b) == -1);
+	assert(r.tv_sec  == TIME_MAX);
+	assert(r.tv_usec == 999999L);
+
+	a.tv_sec = TIME_MIN, a.tv_usec = 0L;
+	b.tv_sec = TIME_MIN, b.tv_usec = 0L;
+	assert(libsimple_sumtimeval(&r, &a, &b) == -1);
+	assert(r.tv_sec  == TIME_MIN);
+	assert(r.tv_usec == 0L);
+
+	a.tv_sec = TIME_MIN, a.tv_usec = 100L;
+	b.tv_sec = TIME_MIN, b.tv_usec = 100L;
+	assert(libsimple_sumtimeval(&r, &a, &b) == -1);
+	assert(r.tv_sec  == TIME_MIN);
+	assert(r.tv_usec == 0L);
+
+	return 0;
+}
+
+#endif