BAEL-7041

Commit for the article "Check if List Contains At Least One Enum" which adds the "CheckIfListContainsEnumUnitTest" class to check if a list contains an enum in Java.

core-java-modules/core-java-collections-5/src/test/java/com/baeldung/checkiflistcontainsenum/CheckIfListContainsEnumUnitTest.java

@@ -0,0 +1,76 @@
+package com.baeldung.checkiflistcontainsenum;
+
+import java.util.*;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class CheckIfListContainsEnumUnitTest {
+    private final List<Map<String, Object>> data = new ArrayList<>();
+    public boolean containsDeveloper = false;
+    List<Position> list = Arrays.asList(Position.values());
+
+    public CheckIfListContainsEnumUnitTest() {
+        Map<String, Object> map = new HashMap<>();
+        map.put("Name", "John");
+        map.put("Age", 25);
+        map.put("Position", Position.DEVELOPER);
+
+        data.add(map);
+    }
+
+
+    @Test
+    public void givenDataList_whenUsingLoop_thenCheckIfListContainsEnum() {
+        for (Map<String, Object> entry : data) {
+            Object positionValue = entry.get("Position");
+
+            for (Position position : Position.values()) {
+                if (positionValue.equals(position)) {
+                    containsDeveloper = true;
+                    break;
+                }
+            }
+
+            if (containsDeveloper) {
+                break;
+            }
+        }
+
+        Assert.assertTrue(containsDeveloper);
+    }
+
+    @Test
+    public void givenDataList_whenUsingStream_thenCheckIfListContainsEnum() {
+        containsDeveloper = data.stream()
+                .map(entry -> entry.get("Position"))
+                .anyMatch(position -> Arrays.asList(Position.values()).contains(position));
+
+        Assert.assertTrue(containsDeveloper);
+    }
+
+    @Test
+    public void givenDataList_whenUsingDisjointMethod_thenCheckIfListContainsEnum() {
+        List<Position> positionValues = data.stream()
+                .map(entry -> (Position) entry.get("Position"))
+                .toList();
+
+        boolean containsDeveloper = !Collections.disjoint(list, positionValues);
+        Assert.assertTrue(containsDeveloper);
+    }
+
+
+    public enum Position {
+        DEVELOPER("Dev"), MANAGER("Mgr"), ANALYST("Analyst");
+
+        private final String value;
+
+        Position(String value) {
+            this.value = value;
+        }
+
+        public String getValue() {
+            return value;
+        }
+    }
+}