1 files changed, 12 insertions, 0 deletions
diff --git a/spec/ruby/core/io/fileno_spec.rb b/spec/ruby/core/io/fileno_spec.rb
new file mode 100644
index 0000000000..259ac38073
--- /dev/null
+++ b/spec/ruby/core/io/fileno_spec.rb
@@ -0,0 +1,12 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "IO#fileno" do
+  it "returns the numeric file descriptor of the given IO object" do
+    $stdout.fileno.should == 1
+  end
+
+  it "raises IOError on closed stream" do
+    lambda { IOSpecs.closed_io.fileno }.should raise_error(IOError)
+  end
+end