require_relative '../../spec_helper' require 'strscan' describe "StringScanner#exist?" do before :each do @s = StringScanner.new("This is a test") end it "returns the index of the first occurrence of the given pattern" do @s.exist?(/s/).should == 4 @s.scan(/This is/) @s.exist?(/s/).should == 6 end it "returns 0 if the pattern is empty" do @s.exist?(//).should == 0 end it "returns nil if the pattern isn't found in the string" do @s.exist?(/S/).should == nil @s.scan(/This is/) @s.exist?(/i/).should == nil end end