--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/cpp/assert1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,46 @@
+/* Basic tests of the #assert preprocessor extension. */
+/* { dg-do compile } */
+/* { dg-options "-Wno-deprecated" } */
+
+#define def unused expansion
+#define fail  int fail
+
+#assert abc (def)
+#assert abc (ghi)
+#assert abc (jkl)
+#assert space ( s p a c e )
+
+/* Basic: */
+#if !#abc (def) || !#abc (ghi) || !#abc (jkl)
+fail
+#endif
+
+/* any answer for #abc */
+#if !#abc
+fail
+#endif
+
+/* internal whitespace is collapsed,
+   external whitespace is deleted  */
+#if !#space (s p  a  c e) || !#space (  s p a c e  ) || #space (space)
+fail
+#endif
+
+/* removing assertions */
+#unassert abc (jkl)
+#if !#abc || !#abc (def) || !#abc (ghi) || #abc (jkl)
+fail
+#endif
+
+#unassert abc
+#if #abc || #abc (def) || #abc (ghi) || #abc (jkl)
+fail
+#endif
+
+int gobble
+
+/* make sure it can succeed too.
+   also check space before open paren isn't significant */
+#if #space(s p a c e)
+;
+#endif