LargestProductTest.java

import org.junit.Ignore;
import org.junit.Test;

import java.util.Arrays;

import static org.fest.assertions.Assertions.assertThat;

public class LargestProductTest {

   @Test
   public void greatestProductInRowMatrixOfOnesOfLengthFourOfZeros() {
      Grid grid = new Grid().add(Arrays.asList(0, 0, 0, 0));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(0);
   }

   @Test
   public void greatestProductInRowMatrixOfOnesOfLengthFour() {
      Grid grid = new Grid().add(Arrays.asList(1, 1, 1, 1));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(1);
   }

   @Test
   public void greatestProductInRowMatrixOfLengthFour() {
      Grid grid = new Grid().add(Arrays.asList(2, 1, 1, 1));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(2);
   }

   @Test
   public void greatestProductInRowMatrixOfLengthFive() {
      Grid grid = new Grid().add(Arrays.asList(2, 1, 1, 1, 3));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(3);
   }

   @Test
   public void greatest_product_in_one_column_matrix_of_4() {
      Grid grid = new Grid()
        .add(Arrays.asList(1))
        .add(Arrays.asList(1))
        .add(Arrays.asList(1))
        .add(Arrays.asList(1));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(1);
   }

   @Test
   public void greatest_product_in_two_column_matrix_of_4() {
      Grid grid = new Grid()
        .add(Arrays.asList(1, 1))
        .add(Arrays.asList(1, 1))
        .add(Arrays.asList(1, 1))
        .add(Arrays.asList(1, 2));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(2);
   }

   @Test
   public void greatest_product_in_4_by_4_matrix() {
      Grid grid = new Grid()
        .add(Arrays.asList(1, 50, 1, 1))
        .add(Arrays.asList(1, 2, 1, 1))
        .add(Arrays.asList(1, 1, 3, 1))
        .add(Arrays.asList(1, 1, 1, 4));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(24);
   }

   @Test
   public void greatest_product_of_one_column() {
      Grid grid = new Grid()
        .add(Arrays.asList(2, 1, 2, 1, 3))
        .add(Arrays.asList(2, 1, 1, 1, 1));
      Integer answer = grid.calculate();
      assertThat(answer).isEqualTo(6);
   }


   @Test
   public void greatestProductGridShouldBeEqual() {
      Grid grid = new Grid()
        .add(Arrays.asList(8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8))
        .add(Arrays.asList(49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0))
        .add(Arrays.asList(81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65))
        .add(Arrays.asList(52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91))
        .add(Arrays.asList(22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80))
        .add(Arrays.asList(24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50))
        .add(Arrays.asList(32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70))
        .add(Arrays.asList(67, 26, 20, 100, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21))
        .add(Arrays.asList(24, 55, 58, 100, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72))
        .add(Arrays.asList(21, 36, 23, 100, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95))
        .add(Arrays.asList(78, 17, 53, 100, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92))
        .add(Arrays.asList(16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57))
        .add(Arrays.asList(86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58))
        .add(Arrays.asList(19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40))
        .add(Arrays.asList(4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66))
        .add(Arrays.asList(88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69))
        .add(Arrays.asList(4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36))
        .add(Arrays.asList(20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16))
        .add(Arrays.asList(20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54))
        .add(Arrays.asList(1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48));

      Integer answer = grid.calculate();

      assertThat(answer).isEqualTo(100000000);
   }

   @Test
   public void greatestProductGridShouldBeEqualTo70600674() {
      Grid grid = new Grid()
        .add(Arrays.asList(8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8))
        .add(Arrays.asList(49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0))
        .add(Arrays.asList(81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65))
        .add(Arrays.asList(52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91))
        .add(Arrays.asList(22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80))
        .add(Arrays.asList(24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50))
        .add(Arrays.asList(32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70))
        .add(Arrays.asList(67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21))
        .add(Arrays.asList(24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72))
        .add(Arrays.asList(21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95))
        .add(Arrays.asList(78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92))
        .add(Arrays.asList(16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57))
        .add(Arrays.asList(86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58))
        .add(Arrays.asList(19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40))
        .add(Arrays.asList(4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66))
        .add(Arrays.asList(88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69))
        .add(Arrays.asList(4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36))
        .add(Arrays.asList(20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16))
        .add(Arrays.asList(20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54))
        .add(Arrays.asList(1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48));

      Integer answer = grid.calculate();

      assertThat(answer).isEqualTo(70600674);
   }
}