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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Kernel.throw" do
it "transfers control to the end of the active catch block waiting for symbol" do
catch(:blah) do
:value
throw :blah
fail("throw didn't transfer the control")
end.should be_nil
end
it "transfers control to the innermost catch block waiting for the same sympol" do
one = two = three = 0
catch :duplicate do
catch :duplicate do
catch :duplicate do
one = 1
throw :duplicate
end
two = 2
throw :duplicate
end
three = 3
throw :duplicate
end
[one, two, three].should == [1, 2, 3]
end
it "sets the return value of the catch block to nil by default" do
res = catch :blah do
throw :blah
end
res.should == nil
end
it "sets the return value of the catch block to a value specified as second parameter" do
res = catch :blah do
throw :blah, :return_value
end
res.should == :return_value
end
it "raises an ArgumentError if there is no catch block for the symbol" do
lambda { throw :blah }.should raise_error(ArgumentError)
end
it "raises an UncaughtThrowError if there is no catch block for the symbol" do
lambda { throw :blah }.should raise_error(UncaughtThrowError)
end
it "raises ArgumentError if 3 or more arguments provided" do
lambda {
catch :blah do
throw :blah, :return_value, 2
end
}.should raise_error(ArgumentError)
lambda {
catch :blah do
throw :blah, :return_value, 2, 3, 4, 5
end
}.should raise_error(ArgumentError)
end
it "can throw an object" do
lambda {
obj = Object.new
catch obj do
throw obj
end
}.should_not raise_error(NameError)
end
end
describe "Kernel#throw" do
it "is a private method" do
Kernel.should have_private_instance_method(:throw)
end
end
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