From 6a2fcd54c33f583e28b6bd379948066a18171a05 Mon Sep 17 00:00:00 2001
From: Vishal <vakkalkote@gmail.com>
Date: Wed, 12 Aug 2020 09:57:39 +0530
Subject: [PATCH] Add unit test to assert two list equality without considering
 order of elements in it.

---
 testing-modules/testing-assertions/pom.xml    | 12 +++++
 .../OrderAgnosticListComparison.java          | 46 +++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 testing-modules/testing-assertions/src/test/java/com/baeldung/listassert/OrderAgnosticListComparison.java

diff --git a/testing-modules/testing-assertions/pom.xml b/testing-modules/testing-assertions/pom.xml
index 0a7c4b0860..fe8c86d058 100644
--- a/testing-modules/testing-assertions/pom.xml
+++ b/testing-modules/testing-assertions/pom.xml
@@ -24,5 +24,17 @@
             <version>3.15.0</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>4.4</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>
diff --git a/testing-modules/testing-assertions/src/test/java/com/baeldung/listassert/OrderAgnosticListComparison.java b/testing-modules/testing-assertions/src/test/java/com/baeldung/listassert/OrderAgnosticListComparison.java
new file mode 100644
index 0000000000..b03723e5bd
--- /dev/null
+++ b/testing-modules/testing-assertions/src/test/java/com/baeldung/listassert/OrderAgnosticListComparison.java
@@ -0,0 +1,46 @@
+package com.baeldung.listassert;
+
+import org.hamcrest.Matchers;
+import org.apache.commons.collections4.CollectionUtils;
+import org.junit.Test;
+
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class OrderAgnosticListComparison {
+
+    private final List<Integer> first = Arrays.asList(1, 3, 4, 6, 8);
+    private final List<Integer> second = Arrays.asList(8, 1, 6, 3, 4);
+    private final List<Integer> third = Arrays.asList(1, 3, 3, 6, 6);
+
+    //In this test using simple JUnit assertion
+    @Test
+    public void whenTestingForOrderAgnosticEqualityShouldBeTrue() {
+        assertTrue(first.size() == second.size() &&
+                first.containsAll(second) && second.containsAll(first));
+    }
+
+    @Test
+    public void whenTestingForOrderAgnosticEqualityShouldBeFalse() {
+        assertFalse(first.size() == third.size() &&
+                first.containsAll(third) && third.containsAll(first));
+    }
+
+    //In this test using Hamcrest lib apis for assertion
+    @Test
+    public void whenTestingForOrderAgnosticEqualityShouldBeEqual() {
+        assertThat(first, Matchers.containsInAnyOrder(second.toArray()));
+    }
+
+    //In this test asserting lists using Apache Commons apis
+    @Test
+    public void whenTestingForOrderAgnosticEqualityShouldBeTrueIfEqualOtherwiseFalse() {
+        assertTrue(CollectionUtils.isEqualCollection(first, second));
+        assertFalse(CollectionUtils.isEqualCollection(first, third));
+    }
+}