src/utils_latency.c: Add unit test.

[collectd.git] / src / utils_latency_test.c

diff --git a/src/utils_latency_test.c b/src/utils_latency_test.c
new file mode 100644 (file)
index 0000000..9aecf38
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+++ b/src/utils_latency_test.c
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+/**
+ * collectd - src/utils_latency_test.c
+ * Copyright (C) 2015       Florian octo Forster
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *   Florian octo Forster <octo at collectd.org>
+ */
+
+#define DBL_PRECISION 1e-9
+
+#include "testing.h"
+#include "collectd.h"
+#include "common.h" /* for STATIC_ARRAY_SIZE */
+#include "utils_time.h"
+#include "utils_latency.h"
+
+DEF_TEST(simple)
+{
+  struct {
+    double val;
+    double min;
+    double max;
+    double sum;
+    double avg;
+  } cases[] = {
+  /* val  min  max  sum  avg */
+    {0.5, 0.5, 0.5, 0.5, 0.5},
+    {0.3, 0.3, 0.5, 0.8, 0.4},
+    {0.7, 0.3, 0.7, 1.5, 0.5},
+    {2.5, 0.3, 2.5, 4.0, 1.0},
+    { -1, 0.3, 2.5, 4.0, 1.0},
+  };
+  size_t i;
+  latency_counter_t *l;
+
+  CHECK_NOT_NULL (l = latency_counter_create ());
+
+  for (i = 0; i < STATIC_ARRAY_SIZE (cases); i++) {
+    latency_counter_add (l, DOUBLE_TO_CDTIME_T (cases[i].val));
+
+    DBLEQ (cases[i].min, CDTIME_T_TO_DOUBLE (latency_counter_get_min (l)));
+    DBLEQ (cases[i].max, CDTIME_T_TO_DOUBLE (latency_counter_get_max (l)));
+    DBLEQ (cases[i].sum, CDTIME_T_TO_DOUBLE (latency_counter_get_sum (l)));
+    DBLEQ (cases[i].avg, CDTIME_T_TO_DOUBLE (latency_counter_get_average (l)));
+  }
+
+  latency_counter_destroy (l);
+  return 0;
+}
+
+DEF_TEST(percentile)
+{
+  size_t i;
+  latency_counter_t *l;
+
+  CHECK_NOT_NULL (l = latency_counter_create ());
+
+  for (i = 0; i < 100; i++) {
+    latency_counter_add (l, TIME_T_TO_CDTIME_T (((time_t) i) + 1));
+  }
+
+  DBLEQ (  1.0, CDTIME_T_TO_DOUBLE (latency_counter_get_min (l)));
+  DBLEQ (100.0, CDTIME_T_TO_DOUBLE (latency_counter_get_max (l)));
+  DBLEQ (100.0 * 101.0 / 2.0, CDTIME_T_TO_DOUBLE (latency_counter_get_sum (l)));
+  DBLEQ ( 50.5, CDTIME_T_TO_DOUBLE (latency_counter_get_average (l)));
+
+  DBLEQ (50.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 50.0)));
+  DBLEQ (80.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 80.0)));
+  DBLEQ (95.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 95.0)));
+  DBLEQ (99.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 99.0)));
+
+  CHECK_ZERO (latency_counter_get_percentile (l, -1.0));
+  CHECK_ZERO (latency_counter_get_percentile (l, 101.0));
+
+  latency_counter_destroy (l);
+  return 0;
+}
+
+int main (void)
+{
+  RUN_TEST(simple);
+  RUN_TEST(percentile);
+
+  END_TEST;
+}
+
+/* vim: set sw=2 sts=2 et : */