From 94522bfed1cf1851ec53c8e34af899d6380eacf0 Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Fri, 21 Oct 2016 16:51:06 +0200
Subject: [PATCH] test: add hwclock unit test

---
 test/unit/hwclock.c | 72 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 test/unit/hwclock.c

diff --git a/test/unit/hwclock.c b/test/unit/hwclock.c
new file mode 100644
index 0000000..f5667ed
--- /dev/null
+++ b/test/unit/hwclock.c
@@ -0,0 +1,72 @@
+/*
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar  2016
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+ */
+
+#include <hwclock.c>
+#include "test.h"
+
+void
+test_unit(void)
+{
+  struct timespec start_hw_ts, start_local_ts, hw_ts, local_ts, ts;
+  HCL_Instance clock;
+  double freq, jitter, interval, d;
+  int i, j;
+
+  LCL_Initialise();
+
+  clock = HCL_CreateInstance();
+
+  for (i = 0; i < 2000; i++) {
+    UTI_ZeroTimespec(&start_hw_ts);
+    UTI_ZeroTimespec(&start_local_ts);
+    UTI_AddDoubleToTimespec(&start_hw_ts, TST_GetRandomDouble(0.0, 1e9), &start_hw_ts);
+    UTI_AddDoubleToTimespec(&start_local_ts, TST_GetRandomDouble(0.0, 1e9), &start_local_ts);
+
+    DEBUG_LOG(0, "iteration %d", i);
+
+    freq = TST_GetRandomDouble(0.9, 1.1);
+    jitter = TST_GetRandomDouble(10.0e-9, 1000.0e-9);
+    interval = TST_GetRandomDouble(MIN_SAMPLE_SEPARATION / 10, MIN_SAMPLE_SEPARATION * 10.0);
+
+    clock->n_samples = 0;
+    clock->valid_coefs = 0;
+
+    for (j = 0; j < 100; j++) {
+      UTI_AddDoubleToTimespec(&start_hw_ts, j * interval * freq + TST_GetRandomDouble(-jitter, jitter), &hw_ts);
+      UTI_AddDoubleToTimespec(&start_local_ts, j * interval, &local_ts);
+      if (HCL_CookTime(clock, &hw_ts, &ts, NULL)) {
+        d = UTI_DiffTimespecsToDouble(&ts, &local_ts);
+        TEST_CHECK(fabs(d) <= 5.0 * jitter);
+      }
+
+      if (HCL_NeedsNewSample(clock, &local_ts))
+        HCL_AccumulateSample(clock, &hw_ts, &local_ts, 2.0 * jitter);
+
+      TEST_CHECK(j < 20 || clock->valid_coefs);
+
+      if (!clock->valid_coefs)
+        continue;
+
+      TEST_CHECK(fabs(clock->offset) <= 2.0 * jitter);
+    }
+  }
+
+  LCL_Finalise();
+}