diff options
Diffstat (limited to 'spec/ruby/core/io/sysseek_spec.rb')
-rw-r--r-- | spec/ruby/core/io/sysseek_spec.rb | 44 |
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 |