1 files changed, 5 insertions, 0 deletions
diff --git a/spec/ruby/core/io/sysread_spec.rb b/spec/ruby/core/io/sysread_spec.rb
index 024200efea..8201ad47ca 100644
--- a/spec/ruby/core/io/sysread_spec.rb
+++ b/spec/ruby/core/io/sysread_spec.rb
@@ -50,6 +50,11 @@ describe "IO#sysread on a file" do
     @file.sysread(5).should == "56789"
   end
 
+  it "raises an error when called after buffered reads" do
+    @file.readline
+    -> { @file.sysread(5) }.should raise_error(IOError)
+  end
+
   it "reads normally even when called immediately after a buffered IO#read" do
     @file.read(15)
     @file.sysread(5).should == "56789"