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require 'spec_helper'
require 'mspec/guards'
require 'mspec/helpers'
RSpec.describe Object, "#argf" do
before :each do
@saved_argv = ARGV.dup
@argv = [__FILE__]
end
it "sets @argf to an instance of ARGF.class with the given argv" do
argf @argv do
expect(@argf).to be_an_instance_of ARGF.class
expect(@argf.filename).to eq(@argv.first)
end
expect(@argf).to be_nil
end
it "does not alter ARGV nor ARGF" do
argf @argv do
end
expect(ARGV).to eq(@saved_argv)
expect(ARGF.argv).to eq(@saved_argv)
end
it "does not close STDIN" do
argf ['-'] do
end
expect(STDIN).not_to be_closed
end
it "disallows nested calls" do
argf @argv do
expect { argf @argv }.to raise_error
end
end
end
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