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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
lambda { @argf.rewind }.should raise_error(ArgumentError)
end
end
end
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