X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Ftest%2Fjava%2Fde%2Fjuplo%2Fkafka%2FSumBusinessLogicTest.java;h=a0e5e6ed1dd139e5976958e638169f5ffebea736;hb=5f35354fd694f78599d66ee9e01fb4c0d89cc5bb;hp=ff9fdd08e2b0302e47735d623f6897ef095520f2;hpb=614ab1f07d1cae49c06b8bcbd6132e0aa5827246;p=demos%2Fkafka%2Ftraining

diff --git a/src/test/java/de/juplo/kafka/SumBusinessLogicTest.java b/src/test/java/de/juplo/kafka/SumBusinessLogicTest.java
index ff9fdd0..a0e5e6e 100644
--- a/src/test/java/de/juplo/kafka/SumBusinessLogicTest.java
+++ b/src/test/java/de/juplo/kafka/SumBusinessLogicTest.java
@@ -2,6 +2,14 @@ package de.juplo.kafka;
 
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.util.Arrays;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.*;
 
@@ -41,4 +49,94 @@ public class SumBusinessLogicTest
     sumBusinessLogic.startSum("foo");
     assertThat(sumBusinessLogic.getSum("foo")).isNotEmpty();
   }
+
+  @Test
+  @DisplayName("A sum can be ended, if it does exist")
+  public void testCanEndIfSumExists()
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    sumBusinessLogic.startSum("foo");
+    assertThatNoException().isThrownBy(() -> sumBusinessLogic.endSum("foo"));
+  }
+
+  @Test
+  @DisplayName("An existing Sum returns a non-null value, if ended")
+  public void testEndSumReturnsNonNullValueIfSumExists()
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    sumBusinessLogic.startSum("foo");
+    assertThat(sumBusinessLogic.endSum("foo")).isNotNull();
+  }
+
+  @Test
+  @DisplayName("An existing Sum returns a non-negative value, if ended")
+  public void testEndSumReturnsNonNegativeValueIfSumExists()
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    sumBusinessLogic.startSum("foo");
+    assertThat(sumBusinessLogic.endSum("foo")).isNotNegative();
+  }
+
+  @Test
+  @DisplayName("Ending a non-existing sum, causes an IllegalStateException")
+  public void testEndSumCausesExceptionIfNotExists()
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    assertThatIllegalStateException().isThrownBy(() -> sumBusinessLogic.endSum("foo"));
+  }
+
+  @Test
+  @DisplayName("Adding to a non-existent sum causes an IllegalStateException")
+  public void testAddToSumCausesExceptionIfNotExists()
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    assertThatIllegalStateException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", 1));
+  }
+
+  @Test
+  @DisplayName("Adding a null-value to an existing sum causes an IllegalArgumentException")
+  public void testAddNullToExistingSumCausesException()
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    sumBusinessLogic.startSum("foo");
+    assertThatIllegalArgumentException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", null));
+  }
+
+  @ParameterizedTest(name = "{index}: Adding {0}")
+  @DisplayName("Adding a non-positive value to an existing sum causes an IllegalArgumentException")
+  @ValueSource(ints = { 0, -1, -6, -66, Integer.MIN_VALUE })
+  public void testAddingNonPositiveValueToExistingSumCausesException(int value)
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    sumBusinessLogic.startSum("foo");
+    assertThatIllegalArgumentException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", value));
+  }
+
+  @Test
+  @DisplayName("Can add a positive value to an existing sum")
+  public void testCanAddPositiveValueToExistingSum()
+  {
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    sumBusinessLogic.startSum("foo");
+    assertThatIllegalArgumentException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", -1));
+  }
+
+  @ParameterizedTest(name = "{index}: Summing up {0}")
+  @DisplayName("Adds up numbers correctly")
+  @MethodSource("numbersProvider")
+  public void testCanAddPositiveValueToExistingSum(int... numbers)
+  {
+    long expectedResult = Arrays.stream(numbers).sum();
+    SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+    sumBusinessLogic.startSum("foo");
+    Arrays.stream(numbers).forEach(number -> sumBusinessLogic.addToSum("foo", number));
+    assertThat(sumBusinessLogic.endSum("foo")).isEqualTo(expectedResult);
+  }
+
+  static Stream<Arguments> numbersProvider() {
+    return Stream.of(
+        Arguments.of((Object) IntStream.rangeClosed(1,9).toArray()),
+        Arguments.of((Object) IntStream.rangeClosed(1,19).toArray()),
+        Arguments.of((Object) IntStream.rangeClosed(1,66).toArray()));
+  }
 }