import org.scalatest.{Matchers, FunSuite}

/** @version 1.3.0 */
class PascalsTriangleTest extends FunSuite with Matchers {

  test("zero rows") {
    PascalsTriangle.rows(0) should be(List())
  }

  test("single row") {
    pending
    PascalsTriangle.rows(1) should be(List(List(1)))
  }

  test("two rows") {
    pending
    PascalsTriangle.rows(2) should be(List(List(1), List(1, 1)))
  }

  test("three rows") {
    pending
    PascalsTriangle.rows(3) should be(List(List(1), List(1, 1), List(1, 2, 1)))
  }

  test("four rows") {
    pending
    PascalsTriangle.rows(4) should be(
      List(List(1), List(1, 1), List(1, 2, 1), List(1, 3, 3, 1)))
  }

  test("five rows") {
    pending
    PascalsTriangle.rows(5) should be(
      List(List(1),
           List(1, 1),
           List(1, 2, 1),
           List(1, 3, 3, 1),
           List(1, 4, 6, 4, 1)))
  }

  test("six rows") {
    pending
    PascalsTriangle.rows(6) should be(
      List(List(1),
           List(1, 1),
           List(1, 2, 1),
           List(1, 3, 3, 1),
           List(1, 4, 6, 4, 1),
           List(1, 5, 10, 10, 5, 1)))
  }

  test("ten rows") {
    pending
    PascalsTriangle.rows(10) should be(
      List(
        List(1),
        List(1, 1),
        List(1, 2, 1),
        List(1, 3, 3, 1),
        List(1, 4, 6, 4, 1),
        List(1, 5, 10, 10, 5, 1),
        List(1, 6, 15, 20, 15, 6, 1),
        List(1, 7, 21, 35, 35, 21, 7, 1),
        List(1, 8, 28, 56, 70, 56, 28, 8, 1),
        List(1, 9, 36, 84, 126, 126, 84, 36, 9, 1)
      ))
  }

  test("negative rows") {
    pending
    PascalsTriangle.rows(-1) should be(List())
  }
}