1 files changed, 27 insertions, 0 deletions
diff --git a/test/mkmf/test_signedness.rb b/test/mkmf/test_signedness.rb
new file mode 100644
index 0000000000..97fc1078d6
--- /dev/null
+++ b/test/mkmf/test_signedness.rb
@@ -0,0 +1,27 @@
+require_relative 'base'
+
+class TestMkmf
+  class TestSignedness < TestMkmf
+    def test_typeof_builtin
+      bug4144 = '[ruby-dev:42731]'
+      [["", "-1"], ["signed ", "-1"], ["unsigned ", "+1"]].each do |signed, expect|
+        %w[short int long].each do |type|
+          assert_equal(expect.to_i, mkmf {check_signedness(signed+type)}, mkmflog(bug4144))
+        end
+      end
+    end
+
+    def test_typeof_typedef
+      [["", "-1"], ["signed ", "-1"], ["unsigned ", "+1"]].each do |signed, expect|
+        %w[short int long].each do |type|
+          open("confdefs.h", "w") {|f|
+            f.puts "typedef #{signed}#{type} test1_t;"
+          }
+          $defs.clear
+          assert_equal(expect.to_i, mkmf {check_signedness("test1_t", "confdefs.h")}, MKMFLOG)
+          assert_includes($defs, "-DSIGNEDNESS_OF_TEST1_T=#{expect}")
+        end
+      end
+    end
+  end
+end