1 files changed, 6 insertions, 0 deletions
diff --git a/test/mkmf/test_convertible.rb b/test/mkmf/test_convertible.rb
index e8cc280eeb..82189ff100 100644
--- a/test/mkmf/test_convertible.rb
+++ b/test/mkmf/test_convertible.rb
@@ -17,8 +17,14 @@ class TestMkmf
           open("confdefs.h", "w") {|f|
             f.puts "typedef #{signed}#{type} test1_t;"
           }
+          $defs.clear
           assert_equal((prefix || signed)+type,
                        mkmf {convertible_int("test1_t", "confdefs.h")})
+          (u = signed[/^u/]) and u.upcase!
+          assert_includes($defs, "-DTYPEOF_TEST1_T="+"#{prefix||signed}#{type}".quote)
+          assert_includes($defs, "-DPRI_TEST1T_PREFIX=PRI_#{type.upcase}_PREFIX")
+          assert_includes($defs, "-DTEST1T2NUM=#{u}#{type.upcase}2NUM")
+          assert_includes($defs, "-DNUM2TEST1T=NUM2#{u}#{type.upcase}")
         end
       end
     end