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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#to_h" do
it "converts empty array to empty hash" do
[].to_h.should == {}
end
it "converts [key, value] pairs to a hash" do
hash = [[:a, 1], [:b, 2]].to_h
hash.should == { a: 1, b: 2 }
end
it "uses the last value of a duplicated key" do
hash = [[:a, 1], [:b, 2], [:a, 3]].to_h
hash.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])
hash = [[:a, 1], pair].to_h
hash.should == { a: 1, b: 2 }
end
it "raises TypeError if an element is not an array" do
-> { [:x].to_h }.should raise_error(TypeError)
end
it "raises ArgumentError if an element is not a [key, value] pair" do
-> { [[:x]].to_h }.should raise_error(ArgumentError)
end
it "does not accept arguments" do
-> { [].to_h(:a, :b) }.should raise_error(ArgumentError)
end
it "produces a hash that returns nil for a missing element" do
[[:a, 1], [:b, 2]].to_h[:c].should be_nil
end
ruby_version_is "2.6" do
context "with block" do
it "converts [key, value] pairs returned by the block to a Hash" do
[:a, :b].to_h { |k| [k, k.to_s] }.should == { a: 'a', b: 'b' }
end
it "raises ArgumentError if block returns longer or shorter array" do
-> do
[:a, :b].to_h { |k| [k, k.to_s, 1] }
end.should raise_error(ArgumentError, /wrong array length at 0/)
-> do
[:a, :b].to_h { |k| [k] }
end.should raise_error(ArgumentError, /wrong array length at 0/)
end
it "raises TypeError if block returns something other than Array" do
-> do
[:a, :b].to_h { |k| "not-array" }
end.should raise_error(TypeError, /wrong element type String at 0/)
end
it "coerces returned pair to Array with #to_ary" do
x = mock('x')
x.stub!(:to_ary).and_return([:b, 'b'])
[:a].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
[:a].to_h { |k| x }
end.should raise_error(TypeError, /wrong element type MockObject at 0/)
end
end
end
end
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