82 lines
1.7 KiB
Ruby
82 lines
1.7 KiB
Ruby
require_relative '../spec_helper'
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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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-> { 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 = -> { 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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-> { throw :test, 5 }.should raise_error(ArgumentError)
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-> { catch(:different) { throw :test, 5 } }.should raise_error(ArgumentError)
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end
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it "raises an UncaughtThrowError if used to exit a thread" do
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catch(:what) do
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t = Thread.new {
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-> {
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throw :what
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}.should raise_error(UncaughtThrowError)
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}
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t.join
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end
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end
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end
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