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block_spec.rb
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block_spec.rb
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require File.expand_path('../../spec_helper', __FILE__)
require File.expand_path('../fixtures/block', __FILE__)
describe "A block with mismatched arguments" do
it "Should fill in unsupplied arguments with nil" do
ret = nil
BlockSpecs::Yield.new.two_args {|one, two, three| ret = [one, two, three]}
ret.should == [1, 2, nil]
end
it "raises ArgumentError if argument is passed, but the block takes none" do
lambda{
lambda{ || p "block with no argument" }.call(:arg)
}.should raise_error(ArgumentError)
end
end
describe "A block with a 'rest' arg" do
it "collects all of the arguments passed to yield" do
ret = nil
BlockSpecs::Yield.new.splat(1,2,3) {|*args| ret = args}
ret.should == [1,2,3]
end
end
describe "A block with an anonymous 'rest' arg" do
it "ignores all of the arguments passed to yield" do
ret = [1].each {|*| }
ret.should == [1]
end
end
describe "A block whose arguments are splatted" do
it "captures the arguments passed to the block in an array" do
a = []
BlockSpecs::Yield.new.two_args { |*args| a << args }
a.should == [[1, 2]]
end
it "captures the array passed to the block in an array" do
a = []
BlockSpecs::Yield.new.two_arg_array { |*args| a << args }
a.should == [[[1, 2]]]
end
it "yields the correct arguments in a nested block" do
a = []
BlockSpecs::Yield.new.yield_splat_inside_block {|a1, a2| a << [a1, a2]}
a.should == [[1, 0], [2, 1]]
end
end
language_version __FILE__, "block"