top10: 1.1.3 - (RED) Formulated expectations for `Ranking.equals()`

[demos/kafka/wordcount] / src / test / java / de / juplo / kafka / wordcount / top10 / RankingTest.java

diff --git a/src/test/java/de/juplo/kafka/wordcount/top10/RankingTest.java b/src/test/java/de/juplo/kafka/wordcount/top10/RankingTest.java
index e92d87c..26749e9 100644 (file)
--- a/src/test/java/de/juplo/kafka/wordcount/top10/RankingTest.java
+++ b/src/test/java/de/juplo/kafka/wordcount/top10/RankingTest.java
@@ -137,6 +137,52 @@ public class RankingTest
           .isThrownBy(() -> ranking.add(Entry.of(entry.getWord(), entry.getCounter() - 1))));
   }
 
+  @DisplayName("Identical rankings are considered equal")
+  @ParameterizedTest
+  @MethodSource("validRankingsProvider")
+  public void testIdenticalRankingsAreConsideredEaqual(List<Entry> entryList)
+  {
+    assertThat(Ranking.of(toArray(entryList))).isEqualTo(Ranking.of(toArray(entryList)));
+  }
+
+  @DisplayName("Two empty rankings are considered equal")
+  @Test
+  public void testTwoEmptyRankingsAreConsideredEaqual()
+  {
+    assertThat(Ranking.of()).isEqualTo(Ranking.of());
+  }
+
+  @DisplayName("A changed ranking is not considered equal to its unchanged counter-part")
+  @ParameterizedTest
+  @MethodSource("validRankingsProvider")
+  public void testChangedRankingsDoNotEaqualUnchangedOne(List<Entry> entryList)
+  {
+    Ranking changed = Ranking.of(toArray(entryList));
+    changed.add(Entry.of("devilish", 666l));
+    assertThat(changed).isNotEqualTo(Ranking.of(toArray(entryList)));
+  }
+
+  @DisplayName("Rankigs are considered equal, if only the order of words with the same count differ")
+  @Test
+  public void testRankingWithDifferentOrderForSameCountAreEqual()
+  {
+    assertThat(
+        Ranking.of(
+            Entry.of("a1",10l),
+            Entry.of("a2",10l),
+            Entry.of("b1", 9l),
+            Entry.of("b2",9l),
+            Entry.of("c1", 8l),
+            Entry.of("c2", 8l)))
+        .isEqualTo(Ranking.of(
+            Entry.of("a2",10l),
+            Entry.of("a1",10l),
+            Entry.of("b2", 9l),
+            Entry.of("b1",9l),
+            Entry.of("c2", 8l),
+            Entry.of("c1", 8l)));
+  }
+
 
   Entry[] toArray(List<Entry> entryList)
   {