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require_relative '../../spec_helper'
require 'ostruct'
describe "OpenStruct#to_h" do
before :each do
@h = {name: "John Smith", age: 70, pension: 300}
@os = OpenStruct.new(@h)
@to_h = @os.to_h
end
it "returns a Hash with members as keys" do
@to_h.should == @h
end
it "returns a Hash with keys as symbols" do
os = OpenStruct.new("name" => "John Smith", "age" => 70)
os.pension = 300
os.to_h.should == @h
end
it "does not return the hash used as initializer" do
@to_h.should_not equal(@h)
end
it "returns a Hash that is independent from the struct" do
@to_h[:age] = 71
@os.age.should == 70
end
context "with block" do
it "converts [key, value] pairs returned by the block to a hash" do
h = @os.to_h { |k, v| [k.to_s, v*2] }
h.should == { "name" => "John SmithJohn Smith", "age" => 140, "pension" => 600 }
end
it "raises ArgumentError if block returns longer or shorter array" do
-> do
@os.to_h { |k, v| [k.to_s, v*2, 1] }
end.should raise_error(ArgumentError, /element has wrong array length/)
-> do
@os.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
@os.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'])
@os.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
@os.to_h { |k| x }
end.should raise_error(TypeError, /wrong element type MockObject/)
end
end
end
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