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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Enumerable#to_h" do
it "converts empty enumerable to empty hash" do
enum = EnumerableSpecs::EachDefiner.new
enum.to_h.should == {}
end
it "converts yielded [key, value] pairs to a hash" do
enum = EnumerableSpecs::EachDefiner.new([:a, 1], [:b, 2])
enum.to_h.should == { a: 1, b: 2 }
end
it "uses the last value of a duplicated key" do
enum = EnumerableSpecs::EachDefiner.new([:a, 1], [:b, 2], [:a, 3])
enum.to_h.should == { a: 3, b: 2 }
end
it "calls #to_ary on contents" do
pair = mock('to_ary')
pair.should_receive(:to_ary).and_return([:b, 2])
enum = EnumerableSpecs::EachDefiner.new([:a, 1], pair)
enum.to_h.should == { a: 1, b: 2 }
end
it "forwards arguments to #each" do
enum = Object.new
def enum.each(*args)
yield(*args)
yield([:b, 2])
end
enum.extend Enumerable
enum.to_h(:a, 1).should == { a: 1, b: 2 }
end
it "raises TypeError if an element is not an array" do
enum = EnumerableSpecs::EachDefiner.new(:x)
lambda { enum.to_h }.should raise_error(TypeError)
end
it "raises ArgumentError if an element is not a [key, value] pair" do
enum = EnumerableSpecs::EachDefiner.new([:x])
lambda { enum.to_h }.should raise_error(ArgumentError)
end
end
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