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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
it "raises TypeError if given a String" do
-> {
@s.exist?('T')
}.should raise_error(TypeError, 'wrong argument type String (expected Regexp)')
end
end
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