[gtksourceview] tests: add conformance check for string conversion

[Christian Hergert <chergert src gnome org>]

commit cfd2b5ce05f3066e704434af6e16a17f3129aa4d
Author: Christian Hergert <chergert redhat com>
Date:   Thu Apr 18 17:36:51 2019 -0700

    tests: add conformance check for string conversion

 tests/Makefile.am    |  7 +++++-
 tests/test-int2str.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+), 1 deletion(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 0c3fc26a..e4e6668f 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -54,7 +54,12 @@ TEST_PROGS += test-widget
 test_widget_SOURCES = test-widget.c
 nodist_test_widget_SOURCES = test-widget-resources.c
 
-noinst_PROGRAMS = $(TEST_PROGS)
+test_int2str_SOURCES = test-int2str.c
+test_int2str_LDADD = $(top_builddir)/gtksourceview/libgtksourceview-core.la \
+       $(LIBM) \
+       $(DEP_LIBS)
+
+noinst_PROGRAMS = $(TEST_PROGS) test-int2str
 
 EXTRA_DIST =                           \
        syntax-highlighting             \
diff --git a/tests/test-int2str.c b/tests/test-int2str.c
new file mode 100644
index 00000000..2cf82147
--- /dev/null
+++ b/tests/test-int2str.c
@@ -0,0 +1,67 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; coding: utf-8 -*-
+ *
+ * This file is part of GtkSourceView
+ *
+ * Copyright 2019 - Christian Hergert <chergert redhat com>
+ *
+ * GtkSourceView is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * GtkSourceView 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <gtksourceview/gtksource.h>
+#include <gtksourceview/gtksourceutils-private.h>
+
+gint
+main (gint   argc,
+      gchar *argv[])
+{
+       GTimer *timer = g_timer_new ();
+       gdouble d;
+       guint i;
+
+       g_timer_reset (timer);
+       for (i = 0; i < 20000; i++)
+       {
+               const gchar *str;
+
+               _gtk_source_utils_int_to_string (i, &str);
+       }
+       d = g_timer_elapsed (timer, NULL);
+       g_print ("int_to_string: %lf\n", d);
+
+       g_timer_reset (timer);
+       for (i = 0; i < 20000; i++)
+       {
+               gchar tmpbuf[12];
+
+               snprintf (tmpbuf, 12, "%u", i);
+       }
+       d = g_timer_elapsed (timer, NULL);
+       g_print ("     snprintf: %lf\n", d);
+
+       /* Make sure implementation is correct */
+       for (i = 0; i < 20000; i++)
+       {
+               const gchar *str1;
+               gint len1, len2;
+               gchar str2[12];
+
+               len1 = _gtk_source_utils_int_to_string (i, &str1);
+               len2 = snprintf (str2, sizeof str2, "%u", i);
+
+               g_assert_cmpint (len1, ==, len2);
+               g_assert_cmpstr (str1, ==, str2);
+       }
+
+       return 0;
+}