[libgdata] tests: Update perf test to use GTest

[Philip Withnall <pwithnall src gnome org>]

commit 047e41692df42599268aabb2ec91c4b7b10e5b8b
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Wed May 6 08:24:31 2015 +0100

    tests: Update perf test to use GTest
    
    It now asserts that the performance is above some lower bound, and can
    output in TAP format correctly.

 gdata/tests/perf.c |   40 ++++++++++++++++++++++++++++------------
 1 files changed, 28 insertions(+), 12 deletions(-)
---
diff --git a/gdata/tests/perf.c b/gdata/tests/perf.c
index 80f8727..a430643 100644
--- a/gdata/tests/perf.c
+++ b/gdata/tests/perf.c
@@ -1,7 +1,7 @@
 /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
 /*
  * GData Client
- * Copyright (C) Philip Withnall 2010 <philip tecnocode co uk>
+ * Copyright (C) Philip Withnall 2010, 2015 <philip tecnocode co uk>
  *
  * GData Client is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -18,6 +18,7 @@
  */
 
 #include <glib.h>
+#include <stdio.h>
 
 #include "gdata.h"
 #include "common.h"
@@ -74,29 +75,44 @@ test_parse_feed (void)
        g_object_unref (feed);
 }
 
-int
-main (int argc, char *argv[])
+static void
+test_perf_parsing (void)
 {
        GTimeVal start_time, end_time;
        guint i;
-       gdouble total_time;
+       guint64 total_time;  /* microseconds */
+       guint64 per_iteration_time;  /* microseconds */
 
        #define ITERATIONS 10000
 
-#if !GLIB_CHECK_VERSION (2, 35, 0)
-       g_type_init ();
-#endif
-
        /* Test feed parsing time */
        g_get_current_time (&start_time);
        for (i = 0; i < ITERATIONS; i++)
                test_parse_feed ();
        g_get_current_time (&end_time);
 
-       total_time = (gdouble) (end_time.tv_sec - start_time.tv_sec) + (gdouble) (end_time.tv_usec - 
start_time.tv_usec) / (gdouble) G_USEC_PER_SEC;
+       total_time = (end_time.tv_sec - start_time.tv_sec) * G_USEC_PER_SEC +
+                    (end_time.tv_usec - start_time.tv_usec);
+       per_iteration_time = total_time / ITERATIONS;
+
+       /* Prefix with hashes to avoid the output being misinterpreted as TAP
+        * commands. */
+       printf ("# Parsing a feed %u times took:\n"
+               "#  • Total: %.4fs\n"
+               "#  • Per iteration: %.4fs\n",
+               ITERATIONS,
+               (gdouble) total_time / (gdouble) G_USEC_PER_SEC,
+               (gdouble) per_iteration_time / (gdouble) G_USEC_PER_SEC);
+
+       g_assert_cmpuint (per_iteration_time, <, 1000);  /* 1ms */
+}
+
+int
+main (int argc, char *argv[])
+{
+       gdata_test_init (argc, argv);
 
-       g_message ("Parsing a feed %u times took:\n * Total: %fs\n * Per iteration: %fs",
-                  ITERATIONS, total_time, total_time / (gdouble) ITERATIONS);
+       g_test_add_func ("/perf/parsing", test_perf_parsing);
 
-       return 0;
+       return g_test_run ();
 }