Sample code for article - JIRA: (BAEL-1079) Java 8 Streams distinctBy() some property(+ external tools)

libraries/src/test/java/com/baeldung/distinct/DistinctWithStreamexUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.distinct;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import one.util.streamex.StreamEx;
+
+public class DistinctWithStreamexUnitTest {
+    List<Person> personList;
+
+    @Before
+    public void init() {
+        personList = PersonDataGenerator.getPersonListWithFakeValues();
+    }
+
+    @Test
+    public void whenFilterListByName_thenSizeShouldBe4() {
+        List<Person> personListFiltered = StreamEx.of(personList)
+            .distinct(Person::getName)
+            .toList();
+        assertTrue(personListFiltered.size() == 4);
+    }
+
+    @Test
+    public void whenFilterListByAge_thenSizeShouldBe2() {
+        List<Person> personListFiltered = StreamEx.of(personList)
+            .distinct(Person::getAge)
+            .toList();
+        assertTrue(personListFiltered.size() == 2);
+    }
+
+}