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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Struct#to_h" do
it "returns a Hash with members as keys" do
car = StructClasses::Car.new('Ford', 'Ranger')
car.to_h.should == {make: "Ford", model: "Ranger", year: nil}
end
it "returns a Hash that is independent from the struct" do
car = StructClasses::Car.new('Ford', 'Ranger')
car.to_h[:make] = 'Suzuki'
car.make.should == 'Ford'
end
context "with block" do
it "converts [key, value] pairs returned by the block to a hash" do
car = StructClasses::Car.new('Ford', 'Ranger')
h = car.to_h { |k, v| [k.to_s, "#{v}".downcase] }
h.should == { "make" => "ford", "model" => "ranger", "year" => "" }
end
it "passes to a block each pair's key and value as separate arguments" do
s = StructClasses::Ruby.new('3.2.4', 'macos')
ScratchPad.record []
s.to_h { |k, v| ScratchPad << [k, v]; [k, v] }
ScratchPad.recorded.sort.should == [[:platform, 'macos'], [:version, '3.2.4']]
ScratchPad.record []
s.to_h { |*args| ScratchPad << args; [args[0], args[1]] }
ScratchPad.recorded.sort.should == [[:platform, 'macos'], [:version, '3.2.4']]
end
it "raises ArgumentError if block returns longer or shorter array" do
-> do
StructClasses::Car.new.to_h { |k, v| [k.to_s, "#{v}".downcase, 1] }
end.should raise_error(ArgumentError, /element has wrong array length/)
-> do
StructClasses::Car.new.to_h { |k, v| [k] }
end.should raise_error(ArgumentError, /element has wrong array length/)
end
it "raises TypeError if block returns something other than Array" do
-> do
StructClasses::Car.new.to_h { |k, v| "not-array" }
end.should raise_error(TypeError, /wrong element type String/)
end
it "coerces returned pair to Array with #to_ary" do
x = mock('x')
x.stub!(:to_ary).and_return([:b, 'b'])
StructClasses::Car.new.to_h { |k| x }.should == { :b => 'b' }
end
it "does not coerce returned pair to Array with #to_a" do
x = mock('x')
x.stub!(:to_a).and_return([:b, 'b'])
-> do
StructClasses::Car.new.to_h { |k| x }
end.should raise_error(TypeError, /wrong element type MockObject/)
end
end
end
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