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* 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
28 lines
679 B
Ruby
28 lines
679 B
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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require 'strscan'
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describe "StringScanner#unscan" do
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before :each do
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@s = StringScanner.new("This is a test")
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end
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it "set the scan pointer to the previous position" do
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@s.scan(/This/)
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@s.unscan
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@s.matched.should == nil
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@s.pos.should == 0
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end
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it "remember only one previous position" do
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@s.scan(/This/)
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pos = @s.pos
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@s.scan(/ is/)
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@s.unscan
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@s.pos.should == pos
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end
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it "raises a ScanError when the previous match had failed" do
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lambda { @s.unscan }.should raise_error(ScanError)
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lambda { @s.scan(/\d/); @s.unscan }.should raise_error(ScanError)
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end
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end
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