1 files changed, 44 insertions, 0 deletions
diff --git a/spec/ruby/core/io/sysseek_spec.rb b/spec/ruby/core/io/sysseek_spec.rb
new file mode 100644
index 0000000000..bcce968c7d
--- /dev/null
+++ b/spec/ruby/core/io/sysseek_spec.rb
@@ -0,0 +1,44 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../shared/pos', __FILE__)
+
+describe "IO#sysseek" do
+  it_behaves_like :io_set_pos, :seek
+end
+
+describe "IO#sysseek" do
+  before :each do
+    @io = IOSpecs.io_fixture "lines.txt"
+  end
+
+  after :each do
+    @io.close unless @io.closed?
+  end
+
+  it "moves the read position relative to the current position with SEEK_CUR" do
+    @io.sysseek(10, IO::SEEK_CUR)
+    @io.readline.should == "igne une.\n"
+  end
+
+  it "raises an error when called after buffered reads" do
+    @io.readline
+    lambda { @io.sysseek(-5, IO::SEEK_CUR) }.should raise_error(IOError)
+  end
+
+  it "moves the read position relative to the start with SEEK_SET" do
+    @io.sysseek(43, IO::SEEK_SET)
+    @io.readline.should == "Aquí está la línea tres.\n"
+  end
+
+  it "moves the read position relative to the end with SEEK_END" do
+    @io.sysseek(1, IO::SEEK_END)
+
+    # this is the safest way of checking the EOF when
+    # sys-* methods are invoked
+    lambda { @io.sysread(1) }.should raise_error(EOFError)
+
+    @io.sysseek(-25, IO::SEEK_END)
+    @io.sysread(7).should == "cinco.\n"
+  end
+end