array_subsets_test.rb

require_relative "../../test_helper"
require_relative "array_subsets"

describe ArraySubsets do
  describe "edge cases" do
    it "should print an empty string given an empty array" do
      arr = []
      subject = -> { ArraySubsets.run(arr, Array.new(arr.length), 0, 0) }
      expect(subject).must_output ""
    end
  end

  describe "base cases" do
    it "should print subsets of an array with length 1" do
      expected = print_results([], [1])

      arr = [1]
      subject = -> { ArraySubsets.run(arr, Array.new(arr.length), 0, 0) }
      expect(subject).must_output expected
    end

    it "should print subsets of an array with length 2" do
      expected = print_results([], [1], [1, 2], [2])

      arr = [1, 2]
      subject = -> { ArraySubsets.run(arr, Array.new(arr.length), 0, 0) }
      expect(subject).must_output expected
    end
  end

  describe "regular cases" do
    it "should print subsets of an array with length > 2" do
      expected = print_results(
        [],
        [1],
        [1, 2],
        [1, 2, 3],
        [1, 3],
        [2],
        [2, 3],
        [3]
      )

      arr = [1, 2, 3]
      subject = -> { ArraySubsets.run(arr, Array.new(arr.length), 0, 0) }
      expect(subject).must_output expected
    end
  end
end