1 files changed, 21 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 51b67f37f5..7adeae4700 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -3230,4 +3230,25 @@ End
     }
   end if /mswin|mingw|bccwin/ !~ RUBY_PLATFORM
 
+  def test_open_flag
+    make_tempfile do |t|
+      assert_raise(Errno::EEXIST){ open(t, File::WRONLY|File::CREAT, flags: File::EXCL){} }
+      assert_raise(Errno::EEXIST){ open(t, 'w', flags: File::EXCL){} }
+      assert_raise(Errno::EEXIST){ open(t, mode: 'w', flags: File::EXCL){} }
+    end
+  end
+
+  def test_open_flag_binar
+    make_tempfile do |t|
+      open(t, File::RDONLY, flags: File::BINARY) do |f|
+        assert_equal true, f.binmode
+      end
+      open(t, 'r', flags: File::BINARY) do |f|
+        assert_equal true, f.binmode
+      end
+      open(t, mode: 'r', flags: File::BINARY) do |f|
+        assert_equal true, f.binmode
+      end
+    end
+  end if File::BINARY != 0
 end