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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "IO#readline" do
before :each do
@io = IOSpecs.io_fixture "lines.txt"
end
after :each do
@io.close unless @io.closed?
end
it "returns the next line on the stream" do
@io.readline.should == "Voici la ligne une.\n"
@io.readline.should == "Qui è la linea due.\n"
end
it "goes back to first position after a rewind" do
@io.readline.should == "Voici la ligne une.\n"
@io.rewind
@io.readline.should == "Voici la ligne une.\n"
end
it "returns characters after the position set by #seek" do
@io.seek(1)
@io.readline.should == "oici la ligne une.\n"
end
it "raises EOFError on end of stream" do
IOSpecs.lines.length.times { @io.readline }
-> { @io.readline }.should raise_error(EOFError)
end
it "raises IOError on closed stream" do
-> { IOSpecs.closed_io.readline }.should raise_error(IOError)
end
it "assigns the returned line to $_" do
IOSpecs.lines.each do |line|
@io.readline
$_.should == line
end
end
describe "when passed limit" do
it "reads limit bytes" do
@io.readline(3).should == "Voi"
end
it "returns an empty string when passed 0 as a limit" do
@io.readline(0).should == ""
end
it "does not accept Integers that don't fit in a C off_t" do
-> { @io.readline(2**128) }.should raise_error(RangeError)
end
end
describe "when passed separator and limit" do
it "reads limit bytes till the separator" do
# Voici la ligne une.\
@io.readline(" ", 4).should == "Voic"
@io.readline(" ", 4).should == "i "
@io.readline(" ", 4).should == "la "
@io.readline(" ", 4).should == "lign"
@io.readline(" ", 4).should == "e "
end
end
describe "when passed chomp" do
it "returns the first line without a trailing newline character" do
@io.readline(chomp: true).should == IOSpecs.lines_without_newline_characters[0]
end
it "raises exception when options passed as Hash" do
-> { @io.readline({ chomp: true }) }.should raise_error(TypeError)
-> {
@io.readline("\n", 1, { chomp: true })
}.should raise_error(ArgumentError, "wrong number of arguments (given 3, expected 0..2)")
end
end
end
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