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require File.expand_path('../../../../spec_helper', __FILE__)
ruby_version_is "1.9" do
describe "Proc#parameters" do
it "returns an empty Array for a proc expecting no parameters" do
proc {}.parameters.should == []
end
it "returns an Array of Arrays for a proc expecting parameters" do
p = proc {|x| }
p.parameters.should be_an_instance_of(Array)
p.parameters.first.should be_an_instance_of(Array)
end
it "sets the first element of each sub-Array to :opt for optional arguments" do
proc {|x| }.parameters.first.first.should == :opt
proc {|y,*x| }.parameters.first.first.should == :opt
end
it "regards named parameters in procs as optional" do
proc {|x| }.parameters.first.first.should == :opt
end
it "regards parameters with default values as optional" do
lambda {|x=1| }.parameters.first.first.should == :opt
proc {|x=1| }.parameters.first.first.should == :opt
end
it "sets the first element of each sub-Array to :req for required arguments" do
lambda {|x,y=[]| }.parameters.first.first.should == :req
lambda {|y,*x| }.parameters.first.first.should == :req
end
it "regards named parameters in lambdas as required" do
lambda {|x| }.parameters.first.first.should == :req
end
it "sets the first element of each sub-Array to :rest for parameters prefixed with asterisks" do
lambda {|*x| }.parameters.first.first.should == :rest
lambda {|x,*y| }.parameters.last.first.should == :rest
proc {|*x| }.parameters.first.first.should == :rest
proc {|x,*y| }.parameters.last.first.should == :rest
end
it "sets the first element of each sub-Array to :block for parameters prefixed with ampersands" do
lambda {|&x| }.parameters.first.first.should == :block
lambda {|x,&y| }.parameters.last.first.should == :block
proc {|&x| }.parameters.first.first.should == :block
proc {|x,&y| }.parameters.last.first.should == :block
end
it "sets the second element of each sub-Array to the name of the argument" do
lambda {|x| }.parameters.first.last.should == :x
lambda {|x=Math::PI| }.parameters.first.last.should == :x
lambda {|an_argument, glark, &foo| }.parameters[1].last.should == :glark
lambda {|*rest| }.parameters.first.last.should == :rest
lambda {|&block| }.parameters.first.last.should == :block
proc {|x| }.parameters.first.last.should == :x
proc {|x=Math::PI| }.parameters.first.last.should == :x
proc {|an_argument, glark, &foo| }.parameters[1].last.should == :glark
proc {|*rest| }.parameters.first.last.should == :rest
proc {|&block| }.parameters.first.last.should == :block
end
it "ignores unnamed rest args" do
lambda {|x,|}.parameters.should == [[:req, :x]]
end
it "adds nameless rest arg for \"star\" argument" do
lambda {|x,*|}.parameters.should == [[:req, :x], [:rest]]
end
end
end
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