1 files changed, 11 insertions, 0 deletions
diff --git a/spec/ruby/core/io/initialize_spec.rb b/spec/ruby/core/io/initialize_spec.rb
index ba5bc117b7..026252a13d 100644
--- a/spec/ruby/core/io/initialize_spec.rb
+++ b/spec/ruby/core/io/initialize_spec.rb
@@ -27,6 +27,17 @@ describe "IO#initialize" do
     @io.fileno.should == fd
   end
 
+  it "accepts options as keyword arguments" do
+    fd = new_fd @name, "w:utf-8"
+
+    @io.send(:initialize, fd, "w", flags: File::CREAT)
+    @io.fileno.should == fd
+
+    -> {
+      @io.send(:initialize, fd, "w", {flags: File::CREAT})
+    }.should raise_error(ArgumentError, "wrong number of arguments (given 3, expected 1..2)")
+  end
+
   it "raises a TypeError when passed an IO" do
     -> { @io.send :initialize, STDOUT, 'w' }.should raise_error(TypeError)
   end