exercism/elixir/pascals-triangle/test/pascals_triangle_test.exs

defmodule PascalsTriangleTest do
  use ExUnit.Case

  test "one row" do
    assert PascalsTriangle.rows(1) == [[1]]
  end

  test "two rows" do
    assert PascalsTriangle.rows(2) == [[1], [1, 1]]
  end

  test "three rows" do
    assert PascalsTriangle.rows(3) == [[1], [1, 1], [1, 2, 1]]
  end

  test "four rows" do
    assert PascalsTriangle.rows(4) == [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1]]
  end

  test "five rows" do
    assert PascalsTriangle.rows(5) == [[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]
  end

  test "six rows" do
    assert PascalsTriangle.rows(6) == [
             [1],
             [1, 1],
             [1, 2, 1],
             [1, 3, 3, 1],
             [1, 4, 6, 4, 1],
             [1, 5, 10, 10, 5, 1]
           ]
  end

  test "ten rows" do
    assert PascalsTriangle.rows(10) == [
             [1],
             [1, 1],
             [1, 2, 1],
             [1, 3, 3, 1],
             [1, 4, 6, 4, 1],
             [1, 5, 10, 10, 5, 1],
             [1, 6, 15, 20, 15, 6, 1],
             [1, 7, 21, 35, 35, 21, 7, 1],
             [1, 8, 28, 56, 70, 56, 28, 8, 1],
             [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]
           ]
  end

  test "20 rows" do
    assert PascalsTriangle.rows(20) == [
             [1],
             [1, 1],
             [1, 2, 1],
             [1, 3, 3, 1],
             [1, 4, 6, 4, 1],
             [1, 5, 10, 10, 5, 1],
             [1, 6, 15, 20, 15, 6, 1],
             [1, 7, 21, 35, 35, 21, 7, 1],
             [1, 8, 28, 56, 70, 56, 28, 8, 1],
             [1, 9, 36, 84, 126, 126, 84, 36, 9, 1],
             [1, 10, 45, 120, 210, 252, 210, 120, 45, 10, 1],
             [1, 11, 55, 165, 330, 462, 462, 330, 165, 55, 11, 1],
             [1, 12, 66, 220, 495, 792, 924, 792, 495, 220, 66, 12, 1],
             [1, 13, 78, 286, 715, 1287, 1716, 1716, 1287, 715, 286, 78, 13, 1],
             [1, 14, 91, 364, 1001, 2002, 3003, 3432, 3003, 2002, 1001, 364, 91, 14, 1],
             [1, 15, 105, 455, 1365, 3003, 5005, 6435, 6435, 5005, 3003, 1365, 455, 105, 15, 1],
             [
               1,
               16,
               120,
               560,
               1820,
               4368,
               8008,
               11440,
               12870,
               11440,
               8008,
               4368,
               1820,
               560,
               120,
               16,
               1
             ],
             [
               1,
               17,
               136,
               680,
               2380,
               6188,
               12376,
               19448,
               24310,
               24310,
               19448,
               12376,
               6188,
               2380,
               680,
               136,
               17,
               1
             ],
             [
               1,
               18,
               153,
               816,
               3060,
               8568,
               18564,
               31824,
               43758,
               48620,
               43758,
               31824,
               18564,
               8568,
               3060,
               816,
               153,
               18,
               1
             ],
             [
               1,
               19,
               171,
               969,
               3876,
               11628,
               27132,
               50388,
               75582,
               92378,
               92378,
               75582,
               50388,
               27132,
               11628,
               3876,
               969,
               171,
               19,
               1
             ]
           ]
  end
end