From 356ef842f0f024b90fb1261bb99604cfbbace944 Mon Sep 17 00:00:00 2001
From: omerfinger <43134354+omerfinger@users.noreply.github.com>
Date: Wed, 11 Mar 2020 19:59:01 +0200
Subject: [PATCH] How to compare json objects using gson article (#8793)

* How to compare json objects using gson article

* static Assert import
IsObject assert has been deleted

* compare strings test failure example
---
 .../gson/jsoncompare/JsonCompareUnitTest.java | 95 +++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 gson/src/test/java/com/baeldung/gson/jsoncompare/JsonCompareUnitTest.java

diff --git a/gson/src/test/java/com/baeldung/gson/jsoncompare/JsonCompareUnitTest.java b/gson/src/test/java/com/baeldung/gson/jsoncompare/JsonCompareUnitTest.java
new file mode 100644
index 0000000000..84989a7411
--- /dev/null
+++ b/gson/src/test/java/com/baeldung/gson/jsoncompare/JsonCompareUnitTest.java
@@ -0,0 +1,95 @@
+package com.baeldung.gson.jsoncompare;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParser;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class JsonCompareUnitTest {
+    @Test
+    public void givenJsonStrings_whenCompared_thenNotEqual() {
+        String string1 = "{\"fullName\": \"Emily Jenkins\", \"age\": 27    }";
+        String string2 = "{\"fullName\": \"Emily Jenkins\", \"age\": 27}";
+
+        assertNotEquals(string1, string2);
+    }
+
+    @Test
+    public void givenIdenticalSimpleObjects_whenCompared_thenEqual() {
+        JsonParser parser = new JsonParser();
+        String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27 }}";
+        String string2 = "{\"customer\": {\"id\": \"44521\", \"fullName\": \"Emily Jenkins\",\"age\": 27}}";
+
+        assertTrue(parser.parse(string1)
+            .isJsonObject());
+        assertEquals(parser.parse(string1), parser.parse(string2));
+    }
+
+    @Test
+    public void givenSameObjectsInDifferentOrder_whenCompared_thenEqual() {
+        JsonParser parser = new JsonParser();
+        String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27 }}";
+        String string2 = "{\"customer\": {\"id\": \"44521\",\"age\": 27, \"fullName\": \"Emily Jenkins\" }}";
+
+        JsonElement json1 = parser.parse(string1);
+        JsonElement json2 = parser.parse(string2);
+
+        assertEquals(json1, json2);
+    }
+
+    @Test
+    public void givenIdenticalArrays_whenCompared_thenEqual() {
+        JsonParser parser = new JsonParser();
+        String string1 = "[10, 20, 30]";
+        String string2 = "[10, 20, 30]";
+
+        assertTrue(parser.parse(string1)
+            .isJsonArray());
+        assertEquals(parser.parse(string1), parser.parse(string2));
+    }
+
+    @Test
+    public void givenArraysInDifferentOrder_whenCompared_thenNotEqual() {
+        JsonParser parser = new JsonParser();
+        String string1 = "[20, 10, 30]";
+        String string2 = "[10, 20, 30]";
+
+        assertNotEquals(parser.parse(string1), parser.parse(string2));
+    }
+
+    @Test
+    public void givenIdenticalNestedObjects_whenCompared_thenEqual() {
+        JsonParser parser = new JsonParser();
+        String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"fav_product\": \"Coke\", \"last_buy\": \"2012-04-23\"}}}";
+        String string2 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"fav_product\": \"Coke\"}}}";
+
+        JsonElement json1 = parser.parse(string1);
+        JsonElement json2 = parser.parse(string2);
+
+        assertEquals(json1, json2);
+    }
+
+    @Test
+    public void givenIdenticalNestedObjectsWithArray_whenCompared_thenEqual() {
+        JsonParser parser = new JsonParser();
+        String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"banana\", \"eggs\"]}}}";
+        String string2 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"banana\", \"eggs\"]}}}";
+
+        JsonElement json1 = parser.parse(string1);
+        JsonElement json2 = parser.parse(string2);
+
+        assertEquals(json1, json2);
+    }
+
+    @Test
+    public void givenNestedObjectsDifferentArrayOrder_whenCompared_thenNotEqual() {
+        JsonParser parser = new JsonParser();
+        String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"banana\", \"eggs\"]}}}";
+        String string2 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"eggs\", \"banana\"]}}}";
+
+        JsonElement json1 = parser.parse(string1);
+        JsonElement json2 = parser.parse(string2);
+
+        assertNotEquals(json1, json2);
+    }
+}