1 files changed, 11 insertions, 6 deletions
diff --git a/spec/ruby/core/io/sysseek_spec.rb b/spec/ruby/core/io/sysseek_spec.rb
index bcce968c7d..2384895dc5 100644
--- a/spec/ruby/core/io/sysseek_spec.rb
+++ b/spec/ruby/core/io/sysseek_spec.rb
@@ -1,10 +1,10 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/pos', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/pos'
 
 describe "IO#sysseek" do
-  it_behaves_like :io_set_pos, :seek
+  it_behaves_like :io_set_pos, :sysseek
 end
 
 describe "IO#sysseek" do
@@ -23,7 +23,12 @@ describe "IO#sysseek" do
 
   it "raises an error when called after buffered reads" do
     @io.readline
-    lambda { @io.sysseek(-5, IO::SEEK_CUR) }.should raise_error(IOError)
+    -> { @io.sysseek(-5, IO::SEEK_CUR) }.should.raise(IOError)
+  end
+
+  it "seeks normally even when called immediately after a buffered IO#read" do
+    @io.read(15)
+    @io.sysseek(-5, IO::SEEK_CUR).should == 10
   end
 
   it "moves the read position relative to the start with SEEK_SET" do
@@ -36,7 +41,7 @@ describe "IO#sysseek" do
 
     # this is the safest way of checking the EOF when
     # sys-* methods are invoked
-    lambda { @io.sysread(1) }.should raise_error(EOFError)
+    -> { @io.sysread(1) }.should.raise(EOFError)
 
     @io.sysseek(-25, IO::SEEK_END)
     @io.sysread(7).should == "cinco.\n"