require_relative '../../spec_helper' describe "ARGF.rewind" do before :each do @file1_name = fixture __FILE__, "file1.txt" @file2_name = fixture __FILE__, "file2.txt" @file1 = File.readlines @file1_name @file2 = File.readlines @file2_name end # NOTE: this test assumes that fixtures files have two lines each it "goes back to beginning of current file" do argf [@file1_name, @file2_name] do @argf.gets @argf.rewind @argf.gets.should == @file1.first @argf.gets # finish reading file1 @argf.gets @argf.rewind @argf.gets.should == @file2.first end end it "resets ARGF.lineno to 0" do script = fixture __FILE__, "rewind.rb" out = ruby_exe(script, args: [@file1_name, @file2_name]) out.should == "0\n1\n0\n" end it "raises an ArgumentError when end of stream reached" do argf [@file1_name, @file2_name] do @argf.read -> { @argf.rewind }.should raise_error(ArgumentError) end end end