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describe "Proc#arity" do
before :each do
@p = ProcSpecs::Arity.new
end
it "returns -1 for a block taking |a = 0, *b| argument " do
@p.arity_check { |a = 0, *b| }.should == -1
end
it "returns -1 for a lambda taking one optional argument" do
lambda { |a = 0| }.arity.should == -1
end
it "returns -2 for a lambda taking |a, b = 0| argument " do
lambda { |a, b = 0| }.arity.should == -2
end
it "returns -2 for a lambda taking |a, b = 0, c = 0| argument " do
lambda { |a, b = 0, c = 0| }.arity.should == -2
end
it "returns -2 for a lambda taking |(a, b), c = 0| argument " do
lambda { |(a, b), c = 0| }.arity.should == -2
end
it "returns 0 for a Proc taking one optional argument" do
Proc.new { |a = 0| }.arity.should == 0
end
it "returns 1 for a Proc taking |a, b = 0| argument " do
Proc.new { |a, b = 0| }.arity.should == 1
end
it "returns 1 for a Proc taking |a, b = 0, c = 0| argument " do
Proc.new { |a, b = 0, c = 0| }.arity.should == 1
end
it "returns 1 for a Proc taking |(a, b), c = 0| argument " do
Proc.new { |(a, b), c = 0| }.arity.should == 1
end
end
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