[glib: 3/5] tests: Add some tests for g_string_append_vprintf()

[Sebastian Dröge <sdroege src gnome org>]

commit d6ad10404f1d61d83803336ba5b64ec0bfd07da8
Author: Philip Withnall <pwithnall endlessos org>
Date:   Wed Mar 9 14:09:57 2022 +0000

    tests: Add some tests for g_string_append_vprintf()
    
    This adds coverage of one previously uncovered branch in `gstring.c`.
    Real progress!
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 glib/tests/string.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
---
diff --git a/glib/tests/string.c b/glib/tests/string.c
index 24098d1be..0229099e7 100644
--- a/glib/tests/string.c
+++ b/glib/tests/string.c
@@ -215,6 +215,44 @@ test_string_append (void)
   g_string_free (string, TRUE);
 }
 
+static void string_append_vprintf_va (GString     *string,
+                                      const gchar *format,
+                                      ...) G_GNUC_PRINTF (2, 3);
+
+/* Wrapper around g_string_append_vprintf() which takes varargs */
+static void
+string_append_vprintf_va (GString     *string,
+                          const gchar *format,
+                          ...)
+{
+  va_list args;
+
+  va_start (args, format);
+  g_string_append_vprintf (string, format, args);
+  va_end (args);
+}
+
+static void
+test_string_append_vprintf (void)
+{
+  GString *string;
+
+  /* append */
+  string = g_string_new ("firsthalf");
+
+  string_append_vprintf_va (string, "some %s placeholders", "format");
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat"
+#pragma GCC diagnostic ignored "-Wformat-extra-args"
+  string_append_vprintf_va (string, "%l", "invalid");
+#pragma GCC diagnostic pop
+
+  g_assert_cmpstr (string->str, ==, "firsthalfsome format placeholders");
+
+  g_string_free (string, TRUE);
+}
+
 static void
 test_string_prepend_c (void)
 {
@@ -571,6 +609,7 @@ main (int   argc,
   g_test_add_func ("/string/test-string-assign", test_string_assign);
   g_test_add_func ("/string/test-string-append-c", test_string_append_c);
   g_test_add_func ("/string/test-string-append", test_string_append);
+  g_test_add_func ("/string/test-string-append-vprintf", test_string_append_vprintf);
   g_test_add_func ("/string/test-string-prepend-c", test_string_prepend_c);
   g_test_add_func ("/string/test-string-prepend", test_string_prepend);
   g_test_add_func ("/string/test-string-insert", test_string_insert);