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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Method#arity" do
before(:each) do
@m = MethodSpecs::Methods.new
end
it "returns n, where n is the number of required arguments, when there are zero or more required arguments only" do
@m.method(:zero).arity.should == 0
@m.method(:attr).arity.should == 0
@m.method(:one_req).arity.should == 1
@m.method(:attr=).arity.should == 1
@m.method(:two_req).arity.should == 2
end
it "returns n, where n is the number of required arguments and method created via defined_method" do
@m.method(:zero_defined_method).arity.should == 0
@m.method(:one_req_defined_method).arity.should == 1
@m.method(:two_req_defined_method).arity.should == 2
@m.method(:zero_with_splat_defined_method).arity.should == -1
end
it "returns -(n+1), where n is the number of required arguments, when there is at least one optional argument" do
@m.method(:one_opt).arity.should == -1
@m.method(:one_req_one_opt).arity.should == -2
@m.method(:one_req_two_opt).arity.should == -2
@m.method(:two_req_one_opt).arity.should == -3
end
it "returns -(n+1), where n is the number of required arguments, when there is a splat argument, regardless of optional arguments" do
@m.method(:zero_with_splat).arity.should == -1
@m.method(:one_req_with_splat).arity.should == -2
@m.method(:one_req_one_opt_with_splat).arity.should == -2
@m.method(:one_req_two_opt_with_splat).arity.should == -2
@m.method(:two_req_with_splat).arity.should == -3
@m.method(:two_req_one_opt_with_splat).arity.should == -3
end
it "returns the same value regardless of the presence of a block" do
@m.method(:zero_with_block).arity.should == @m.method(:zero).arity
@m.method(:one_req_with_block).arity.should == @m.method(:one_req).arity
@m.method(:two_req_with_block).arity.should == @m.method(:two_req).arity
@m.method(:one_opt_with_block).arity.should == @m.method(:one_opt).arity
@m.method(:one_req_one_opt_with_block).arity.should == @m.method(:one_req_one_opt).arity
@m.method(:one_req_two_opt_with_block).arity.should == @m.method(:one_req_two_opt).arity
@m.method(:two_req_one_opt_with_block).arity.should == @m.method(:two_req_one_opt).arity
@m.method(:zero_with_splat_and_block).arity.should == @m.method(:zero_with_splat).arity
@m.method(:one_req_with_splat_and_block).arity.should == @m.method(:one_req_with_splat).arity
@m.method(:one_req_one_opt_with_splat_and_block).arity.should == @m.method(:one_req_one_opt_with_splat).arity
@m.method(:one_req_two_opt_with_splat_and_block).arity.should == @m.method(:one_req_two_opt_with_splat).arity
@m.method(:two_req_with_splat_and_block).arity.should == @m.method(:two_req_with_splat).arity
@m.method(:two_req_one_opt_with_splat_and_block).arity.should == @m.method(:two_req_one_opt_with_splat).arity
end
ruby_version_is "1.9" do
describe "for a Method generated by respond_to_missing?" do
it "returns -1" do
@m.method(:handled_via_method_missing).arity.should == -1
end
end
end
end
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