FlowerCostTest.java

import org.fest.assertions.api.Assertions;
import org.junit.Test;

public class FlowerCostTest {

   @Test
   public void acceptance_test(){
      assertFlowersCost(FlowersCostBuilder.aFlowersCostBuilder().people(3).flowers(4).cost(2, 1, 5, 3), 12);
   }

   @Test
   public void equal_number_of_flowers_and_people(){
      assertFlowersCost(FlowersCostBuilder.aFlowersCostBuilder().people(4).flowers(4).cost(2, 3, 3, 5), 13);
   }

   @Test
      public void number_flowers_less_than_number_of_people(){
      assertFlowersCost(FlowersCostBuilder.aFlowersCostBuilder().people(4).flowers(3).cost(2, 3, 3), 8);
   }

   @Test
   public void no_flower(){
      assertFlowersCost(FlowersCostBuilder.aFlowersCostBuilder().people(4).flowers(0), 0);
   }
   @Test
   public void number_flowers_greater_than_number_of_people(){
      assertFlowersCost(FlowersCostBuilder.aFlowersCostBuilder().people(4).flowers(5).cost(5, 4, 3, 2, 1), 16);
   }

   @Test
   public void number_flowers_which_are_picked_in_any_order_greater_than_number_of_people(){
      assertFlowersCost(FlowersCostBuilder.aFlowersCostBuilder().people(4).flowers(5).cost(3, 1, 5, 2, 4), 16);
   }

   private void assertFlowersCost(FlowersCostBuilder flowersCostBuilder, int expected) {
      final FlowersCost flowersCost = flowersCostBuilder.build();
      Assertions.assertThat(flowersCost.calculateMinCost()).isEqualTo(expected);
   }
}