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ruby--ruby/spec/rubyspec/library/stringscanner/exist_spec.rb
eregon 95e8c48dd3 Add in-tree mspec and ruby/spec
* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2017-05-07 12:04:49 +00:00

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591 B
Ruby

require File.expand_path('../../../spec_helper', __FILE__)
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