ruby/spec/rubyspec/core/range/initialize_spec.rb

require File.expand_path('../../../spec_helper', __FILE__)

describe "Range#initialize" do
  before do
    @range = Range.allocate
  end

  it "is private" do
    Range.should have_private_instance_method("initialize")
  end

  it "initializes correctly the Range object when given 2 arguments" do
    lambda { @range.send(:initialize, 0, 1) }.should_not raise_error
  end

  it "initializes correctly the Range object when given 3 arguments" do
    lambda { @range.send(:initialize, 0, 1, true) }.should_not raise_error
  end

  it "raises an ArgumentError if passed without or with only one argument" do
    lambda { @range.send(:initialize) }.should raise_error(ArgumentError)
    lambda { @range.send(:initialize, 1) }.should raise_error(ArgumentError)
  end

  it "raises an ArgumentError if passed with four or more arguments" do
    lambda { @range.send(:initialize, 1, 3, 5, 7) }.should raise_error(ArgumentError)
    lambda { @range.send(:initialize, 1, 3, 5, 7, 9) }.should raise_error(ArgumentError)
  end

  it "raises a NameError if called on an already initialized Range" do
    lambda { (0..1).send(:initialize, 1, 3) }.should raise_error(NameError)
    lambda { (0..1).send(:initialize, 1, 3, true) }.should raise_error(NameError)
  end

  it "raises an ArgumentError if arguments don't respond to <=>" do
    o1 = Object.new
    o2 = Object.new

    lambda { @range.send(:initialize, o1, o2) }.should raise_error(ArgumentError)
  end
end