juplo.de Git - demos/kafka/training/blob - src/test/java/de/juplo/kafka/SumBusinessLogicTest.java

   1 package de.juplo.kafka;
   2
   3 import org.junit.jupiter.api.DisplayName;
   4 import org.junit.jupiter.api.Test;
   5
   6 import static org.assertj.core.api.Assertions.*;
   7
   8
   9 public class SumBusinessLogicTest
  10 {
  11   @Test
  12   @DisplayName("A new sum can be started, if it does not exist")
  13   public void testCanStartSumIfNotExists()
  14   {
  15     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  16     assertThatNoException().isThrownBy(() -> sumBusinessLogic.startSum("foo"));
  17   }
  18
  19   @Test
  20   @DisplayName("Starting an already existing sum again, causes an IllegalStateException")
  21   public void testStartSumCausesExceptionIfExists()
  22   {
  23     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  24     sumBusinessLogic.startSum("foo");
  25     assertThatIllegalStateException().isThrownBy(() -> sumBusinessLogic.startSum("foo"));
  26   }
  27
  28   @Test
  29   @DisplayName("An empty Optional should be returned, for a non-existing sum")
  30   public void testEmptyOptionalForNonExistingSum()
  31   {
  32     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  33     assertThat(sumBusinessLogic.getSum("foo")).isEmpty();
  34   }
  35
  36   @Test
  37   @DisplayName("A non-empty Optional should be returned, for an existing sum")
  38   public void testNonEmptyOptionalForExistingSum()
  39   {
  40     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  41     sumBusinessLogic.startSum("foo");
  42     assertThat(sumBusinessLogic.getSum("foo")).isNotEmpty();
  43   }
  44
  45   @Test
  46   @DisplayName("A sum can be ended, if it does exist")
  47   public void testCanEndIfSumExists()
  48   {
  49     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  50     sumBusinessLogic.startSum("foo");
  51     assertThatNoException().isThrownBy(() -> sumBusinessLogic.endSum("foo"));
  52   }
  53
  54   @Test
  55   @DisplayName("An existing Sum returns a non-null value, if ended")
  56   public void testEndSumReturnsNonNullValueIfSumExists()
  57   {
  58     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  59     sumBusinessLogic.startSum("foo");
  60     assertThat(sumBusinessLogic.endSum("foo")).isNotNull();
  61   }
  62
  63   @Test
  64   @DisplayName("An existing Sum returns a non-negative value, if ended")
  65   public void testEndSumReturnsNonNegativeValueIfSumExists()
  66   {
  67     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  68     sumBusinessLogic.startSum("foo");
  69     assertThat(sumBusinessLogic.endSum("foo")).isNotNegative();
  70   }
  71
  72   @Test
  73   @DisplayName("Ending a non-existing sum, causes an IllegalStateException")
  74   public void testEndSumCausesExceptionIfNotExists()
  75   {
  76     SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
  77     assertThatIllegalStateException().isThrownBy(() -> sumBusinessLogic.endSum("foo"));
  78   }
  79 }