spec/ruby/core/comparable/clamp_spec.rb


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

ruby_version_is '2.4' do
  describe 'Comparable#clamp' do
    it 'raises an Argument error unless given 2 parameters' do
      c = ComparableSpecs::Weird.new(0)
      lambda { c.clamp(c) }.should raise_error(ArgumentError)
      lambda { c.clamp(c, c, c) }.should raise_error(ArgumentError)
    end

    it 'raises an Argument error unless the 2 parameters are correctly ordered' do
      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
      c = ComparableSpecs::Weird.new(3)

      lambda { c.clamp(two, one) }.should raise_error(ArgumentError)
      one.should_receive(:<=>).any_number_of_times.and_return(nil)
      lambda { c.clamp(one, two) }.should raise_error(ArgumentError)
    end

    it 'returns self if within the given parameters' do
      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
      three = ComparableSpecs::WithOnlyCompareDefined.new(3)
      c = ComparableSpecs::Weird.new(2)

      c.clamp(one, two).should equal(c)
      c.clamp(two, two).should equal(c)
      c.clamp(one, three).should equal(c)
      c.clamp(two, three).should equal(c)
    end

    it 'returns the min parameter if smaller than it' do
      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
      c = ComparableSpecs::Weird.new(0)

      c.clamp(one, two).should equal(one)
    end

    it 'returns the max parameter if greater than it' do
      one = ComparableSpecs::WithOnlyCompareDefined.new(1)
      two = ComparableSpecs::WithOnlyCompareDefined.new(2)
      c = ComparableSpecs::Weird.new(3)

      c.clamp(one, two).should equal(two)
    end
  end
end