1 files changed, 58 insertions, 0 deletions
diff --git a/tests/test-c-ldtoastr.c b/tests/test-c-ldtoastr.c
new file mode 100644
index 0000000000..c0402c95da
--- /dev/null
+++ b/tests/test-c-ldtoastr.c
@@ -0,0 +1,58 @@
+/* Test of c_ldtoastr() function.
+   Copyright (C) 2020-2024 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   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, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include "ftoastr.h"
+
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+  /* configure should already have checked that the locale is supported.  */
+  if (setlocale (LC_ALL, "") == NULL)
+    return 1;
+
+  /* Test behaviour of snprintf() as a "control group".
+     (We should be running in a locale where ',' is the decimal point.) */
+  {
+    char s[16];
+
+    snprintf (s, sizeof s, "%#.0f", 1.0);
+    if (!strcmp (s, "1."))
+      {
+        /* Skip the test, since we're not in a useful locale for testing. */
+        return 77;
+      }
+    ASSERT (!strcmp (s, "1,"));
+  }
+
+  /* Test behaviour of c_ldtoastr().
+     It should always use '.' as the decimal point. */
+  {
+    char buf[DBL_BUFSIZE_BOUND];
+
+    c_ldtoastr (buf, sizeof buf, 0, 0, 0.1L);
+    ASSERT (!strcmp (buf, "0.1"));
+  }
+
+  return 0;
+}