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Converts the array to comma-seperated sentence where the last element is joined by the connector word. Options:

• :connector: The word used to join the last element in arrays with two or more elements (default: "and")
  
• :skip_last_comma: Set to true to return "a, b and c" instead of "a, b, and c".

require 'rubygems'
require 'active_support'
require 'test/unit'
require 'dust'

unit_tests do
  test "words are joined nicely" do
    expected = "one, two, and three"
    assert_equal expected, ['one', 'two', 'three'].to_sentence
  end
end