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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
80 lines
1.7 KiB
Ruby
80 lines
1.7 KiB
Ruby
require File.expand_path('../../spec_helper', __FILE__)
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describe "The throw keyword" do
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it "abandons processing" do
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i = 0
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catch(:done) do
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loop do
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i += 1
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throw :done if i > 4
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end
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i += 1
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end
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i.should == 5
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end
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it "supports a second parameter" do
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msg = catch(:exit) do
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throw :exit,:msg
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end
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msg.should == :msg
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end
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it "uses nil as a default second parameter" do
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msg = catch(:exit) do
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throw :exit
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end
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msg.should == nil
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end
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it "clears the current exception" do
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catch :exit do
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begin
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raise "exception"
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rescue
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throw :exit
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end
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end
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$!.should be_nil
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end
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it "allows any object as its argument" do
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catch(1) { throw 1, 2 }.should == 2
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o = Object.new
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catch(o) { throw o, o }.should == o
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end
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it "does not convert strings to a symbol" do
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lambda { catch(:exit) { throw "exit" } }.should raise_error(ArgumentError)
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end
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it "unwinds stack from within a method" do
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def throw_method(handler, val)
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throw handler, val
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end
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catch(:exit) do
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throw_method(:exit, 5)
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end.should == 5
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end
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it "unwinds stack from within a lambda" do
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c = lambda { throw :foo, :msg }
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catch(:foo) { c.call }.should == :msg
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end
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it "raises an ArgumentError if outside of scope of a matching catch" do
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lambda { throw :test, 5 }.should raise_error(ArgumentError)
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lambda { catch(:different) { throw :test, 5 } }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError if used to exit a thread" do
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lambda {
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catch(:what) do
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Thread.new {
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throw :what
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}.join
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end
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}.should raise_error(ArgumentError)
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end
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end
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