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require_relative '../../spec_helper'
require 'strscan'
describe "StringScanner#peek" do
before :each do
@s = StringScanner.new('This is a test')
end
it "returns at most the specified number of bytes from the current position" do
@s.peek(4).should == "This"
@s.pos.should == 0
@s.pos = 5
@s.peek(2).should == "is"
@s.peek(1000).should == "is a test"
s = StringScanner.new("été")
s.peek(2).should == "é"
end
it "returns an empty string when the passed argument is zero" do
@s.peek(0).should == ""
end
it "raises a ArgumentError when the passed argument is negative" do
-> { @s.peek(-2) }.should raise_error(ArgumentError)
end
it "raises a RangeError when the passed argument is a Bignum" do
-> { @s.peek(bignum_value) }.should raise_error(RangeError)
end
it "returns an instance of String when passed a String subclass" do
cls = Class.new(String)
sub = cls.new("abc")
s = StringScanner.new(sub)
ch = s.peek(1)
ch.should_not be_kind_of(cls)
ch.should be_an_instance_of(String)
end
end
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