Should not use `assert` with expressions with side-effect; ref #4981

`assert()` can be completely removed when `NDEBUG` is set.

1 files changed, 15 insertions, 0 deletions

diff --git a/mrbgems/mruby-io/test/mruby_io_test.c b/mrbgems/mruby-io/test/mruby_io_test.c
index d8971bccf..eb3f6108c 100644
--- a/mrbgems/mruby-io/test/mruby_io_test.c
+++ b/mrbgems/mruby-io/test/mruby_io_test.c
@@ -111,6 +111,14 @@ mrb_io_test_io_setup(mrb_state *mrb, mrb_value self)
   int i;
 #if !defined(_WIN32) && !defined(_WIN64)
   struct sockaddr_un sun0;
+
+  if(!(socket_available_p = mrb_io_socket_available())) {
+    char *tmpdir;
+    wd_save = open(".", O_DIRECTORY);
+    tmpdir = getenv("TMPDIR");
+    if (tmpdir) chdir(tmpdir);
+    else chdir("/tmp");
+  }
 #endif
 
   mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_msg"), mrb_str_new_cstr(mrb, msg));
@@ -211,6 +219,13 @@ mrb_io_test_io_cleanup(mrb_state *mrb, mrb_value self)
   mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_socketname"), mrb_nil_value());
   mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_msg"), mrb_nil_value());
 
+#if !defined(_WIN32) && !defined(_WIN64)
+  if(!socket_available_p) {
+    fchdir(wd_save);
+    close(wd_save);
+  }
+#endif
+
   return mrb_nil_value();
 }