require_relative 'spec_helper'
require_relative 'shared/to_hash'

describe "ENV.to_h" do
  it_behaves_like :env_to_hash, :to_h

  context "with block" do
    before do
      @orig_hash = ENV.to_hash
    end

    after do
      ENV.replace @orig_hash
    end

    it "converts [key, value] pairs returned by the block to a hash" do
      ENV.replace("a" => "b", "c" => "d")
      ENV.to_h { |k, v| [k, v.upcase] }.should == { 'a' => "B", 'c' => "D" }
    end

    it "passes to a block each pair's key and value as separate arguments" do
      ENV.replace("a" => "b", "c" => "d")

      ScratchPad.record []
      ENV.to_h { |k, v| ScratchPad << [k, v]; [k, v] }
      ScratchPad.recorded.sort.should == [["a", "b"], ["c", "d"]]

      ScratchPad.record []
      ENV.to_h { |*args| ScratchPad << args; [args[0], args[1]] }
      ScratchPad.recorded.sort.should == [["a", "b"], ["c", "d"]]
    end

    it "does not require the array elements to be strings" do
      ENV.replace("a" => "b", "c" => "d")
      ENV.to_h { |k, v| [k.to_sym, v.to_sym] }.should == { :a => :b, :c => :d }
    end

    it "raises ArgumentError if block returns longer or shorter array" do
      -> do
        ENV.to_h { |k, v| [k, v.upcase, 1] }
      end.should.raise(ArgumentError, /element has wrong array length/)

      -> do
        ENV.to_h { |k, v| [k] }
      end.should.raise(ArgumentError, /element has wrong array length/)
    end

    it "raises TypeError if block returns something other than Array" do
      -> do
        ENV.to_h { |k, v| "not-array" }
      end.should.raise(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'])

      ENV.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
        ENV.to_h { |k| x }
      end.should.raise(TypeError, /wrong element type MockObject/)
    end
  end
end
