[BAEL-3002] Comparing 2 JSON objects with Jackson

jackson-2/src/test/java/com/baeldung/jackson/json/compare/JsonCompareUnitTest.java

@@ -0,0 +1,62 @@
+package com.baeldung.jackson.json.compare;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.Comparator;
+
+import org.junit.Test;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.NumericNode;
+
+public class JsonCompareUnitTest {
+
+    @Test
+    public void givenTwoSameJsonDataObjects_whenCompared_thenAreEqual() throws IOException {
+        ObjectMapper mapper = new ObjectMapper();
+
+        String jsonString1 = "{\"k1\":\"v1\",\"k2\":\"v2\",\"k3\":\"v3\",\"k4\":\"v4\"}";
+        String jsonString2 = "{\"k1\":\"v1\",\"k2\":\"v2\",\"k3\":\"v3\",\"k4\":\"v4\"}";
+        JsonNode actualObj1 = mapper.readTree(jsonString1);
+        JsonNode actualObj2 = mapper.readTree(jsonString2);
+
+        assertTrue(actualObj1.equals(actualObj2));
+
+    }
+
+    @Test
+    public void givenTwoJsonDataObjects_whenComparedUsingCustomComparator_thenEqual() throws Exception {
+        ObjectMapper mapper = new ObjectMapper();
+
+        String jsonString1 = "{\"k1\": 5,\"k2\":9191}";
+        String jsonString2 = "{\"k1\": 5.0,\"k2\":9191}";
+        JsonNode actualObj1 = mapper.readTree(jsonString1);
+        JsonNode actualObj2 = mapper.readTree(jsonString2);
+
+        assertFalse(actualObj1.equals(actualObj2));
+
+        Comparator<JsonNode> cmp = new Comparator<JsonNode>() {
+            @Override
+            public int compare(JsonNode o1, JsonNode o2) {
+                if (o1.equals(o2)) {
+                    return 0;
+                }
+                if ((o1 instanceof NumericNode) && (o2 instanceof NumericNode)) {
+                    double d1 = ((NumericNode) o1).asDouble();
+                    double d2 = ((NumericNode) o2).asDouble();
+                    if (d1 == d2) {
+                        return 0;
+                    }
+                }
+                return 1;
+            }
+        };
+
+        assertTrue(actualObj1.equals(cmp, actualObj2));
+
+    }
+
+}