c-nullptr: Add tests.

* tests/test-nullptr.c: New file.
* modules/c-nullptr-tests: New file.
* tests/test-nullptr-c++.cc: New file.
* modules/c-nullptr-c++-tests: New file.

1 files changed, 69 insertions, 0 deletions

diff --git a/tests/test-nullptr.c b/tests/test-nullptr.c
new file mode 100644
index 0000000000..1f9abc7422
--- /dev/null
+++ b/tests/test-nullptr.c
@@ -0,0 +1,69 @@
+/* Test nullptr.
+   Copyright 2023 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/>.  */
+
+/* Written by Bruno Haible.  */
+
+#include <config.h>
+
+int *my_null = nullptr;
+
+#if 0 /* not yet */
+/* Header that is supposed to define nullptr_t.  */
+# include <stddef.h>
+#endif
+
+#include <stdarg.h>
+
+#include "macros.h"
+
+#if 0 /* not yet */
+
+static void
+simple_callee (nullptr_t x)
+{
+  ASSERT (x == NULL);
+}
+
+#endif
+
+void
+varargs_callee (const char *first, ...)
+{
+  va_list args;
+  const char *arg;
+
+  ASSERT (first[0] == 't');
+  va_start (args, first);
+
+  arg = va_arg (args, const char *);
+  ASSERT (arg == NULL);
+
+  arg = va_arg (args, const char *);
+  ASSERT (arg[0] == 'f');
+
+  arg = va_arg (args, const char *);
+  ASSERT (arg == NULL);
+
+  va_end (args);
+}
+
+int
+main ()
+{
+  varargs_callee ("type", nullptr, "foo", nullptr);
+
+  return 0;
+}