union.spec.rb

# frozen_string_literal: true
require 'hypothesis'
require_dependency 'nuugeo'

RSpec.describe Nuugeo::Viewport::Union do
  include Hypothesis
  include Hypothesis::Possibilities

  def union(left, right)
    described_class.call(left, right)
  end

  def arbitrary_degrees
    integers(min: -180, max: 180)
  end

  def arbitrary_viewport
    hash_of_shape(
      south: arbitrary_degrees,
      west: arbitrary_degrees,
      north: arbitrary_degrees,
      east: arbitrary_degrees
    ).map do |cardinal_points|
      Nuugeo::Viewport.build(cardinal_points)
    end
  end

  describe 'smoke spec' do
    it 'accepts two viewports and returns a viewport' do
      expect(union(Nuugeo::Viewport.empty, Nuugeo::Viewport.empty))
        .to be_kind_of(Nuugeo::Viewport)
    end
  end

  it 'any union of two viewports contains both of the two viewports' do
    hypothesis do
      left_viewport = any arbitrary_viewport
      right_viewport = any arbitrary_viewport

      left_right_union = union(left_viewport, right_viewport)

      expect(left_right_union.contains?(left_viewport)).to be true
      expect(left_right_union.contains?(right_viewport)).to be true
    end
  end
end