BAEL-3091: The Prototype Pattern in Java (changed code based on valid comments from a reader)

json/src/test/java/com/baeldung/escape/JsonEscapeUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.escape;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class JsonEscapeUnitTest {
+
+    private JsonEscape testedInstance;
+    private static final String EXPECTED = "{\"message\":\"Hello \\\"World\\\"\"}";
+
+    @BeforeEach
+    void setUp() {
+        testedInstance = new JsonEscape();
+    }
+
+    @Test
+    void escapeJson() {
+        String actual = testedInstance.escapeJson("Hello \"World\"");
+        assertEquals(EXPECTED, actual);
+    }
+
+    @Test
+    void escapeGson() {
+        String actual = testedInstance.escapeGson("Hello \"World\"");
+        assertEquals(EXPECTED, actual);
+    }
+
+    @Test
+    void escapeJackson() throws JsonProcessingException {
+        String actual = testedInstance.escapeJackson("Hello \"World\"");
+        assertEquals(EXPECTED, actual);
+    }
+}

json/src/test/java/com/baeldung/json/schema/JSONSchemaUnitTest.java

@@ -0,0 +1,32 @@
+package com.baeldung.json.schema;
+
+import org.everit.json.schema.Schema;
+import org.everit.json.schema.ValidationException;
+import org.everit.json.schema.loader.SchemaLoader;
+
+import org.json.JSONObject;
+import org.json.JSONTokener;
+import org.junit.Test;
+
+public class JSONSchemaUnitTest {
+
+    @Test(expected = ValidationException.class)
+    public void givenInvalidInput_whenValidating_thenInvalid() {
+
+        JSONObject jsonSchema = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/schema.json")));
+        JSONObject jsonSubject = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/product_invalid.json")));
+
+        Schema schema = SchemaLoader.load(jsonSchema);
+        schema.validate(jsonSubject);
+    }
+
+    @Test
+    public void givenValidInput_whenValidating_thenValid() {
+
+        JSONObject jsonSchema = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/schema.json")));
+        JSONObject jsonSubject = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/product_valid.json")));
+
+        Schema schema = SchemaLoader.load(jsonSchema);
+        schema.validate(jsonSubject);
+    }
+}

json/src/test/java/com/baeldung/jsonb/JsonbUnitTest.java

@@ -0,0 +1,189 @@
+package com.baeldung.jsonb;
+
+import static org.junit.Assert.assertTrue;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import javax.json.bind.Jsonb;
+import javax.json.bind.JsonbBuilder;
+import javax.json.bind.JsonbConfig;
+import javax.json.bind.config.PropertyNamingStrategy;
+import javax.json.bind.config.PropertyOrderStrategy;
+
+import org.apache.commons.collections4.ListUtils;
+import org.junit.Test;
+
+import com.baeldung.adapter.PersonAdapter;
+import com.baeldung.jsonb.Person;
+
+public class JsonbUnitTest {
+
+    @Test
+    public void givenPersonList_whenSerializeWithJsonb_thenGetPersonJsonArray() {
+        Jsonb jsonb = JsonbBuilder.create();
+        // @formatter:off
+        List<Person> personList = Arrays.asList(
+            new Person(1, "Jhon", "jhon@test.com", 20, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1000)), 
+            new Person(2, "Jhon", "jhon1@test.com", 20, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1500)), 
+            new Person(3, "Jhon", null, 20, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1000)),  
+            new Person(4, "Tom", "tom@test.com", 21, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1500)));            
+        // @formatter:on
+        String jsonArrayPerson = jsonb.toJson(personList);
+        // @formatter:off
+        String jsonExpected = "[" + 
+          "{\"email\":\"jhon@test.com\"," + 
+           "\"id\":1,\"person-name\":\"Jhon\"," + 
+           "\"registeredDate\":\"09-09-2019\"," + 
+           "\"salary\":\"1000.0\"}," +
+          "{\"email\":\"jhon1@test.com\"," +
+           "\"id\":2,\"person-name\":\"Jhon\"," +
+           "\"registeredDate\":\"09-09-2019\"," +
+           "\"salary\":\"1500.0\"},{\"email\":null," +
+           "\"id\":3,\"person-name\":\"Jhon\"," +
+           "\"registeredDate\":\"09-09-2019\"," +
+           "\"salary\":\"1000.0\"}," +
+          "{\"email\":\"tom@test.com\"," +
+           "\"id\":4,\"person-name\":\"Tom\"," +
+           "\"registeredDate\":\"09-09-2019\"," +
+           "\"salary\":\"1500.0\"}"
+           + "]";
+        // @formatter:on
+        assertTrue(jsonArrayPerson.equals(jsonExpected));
+    }
+
+    @Test
+    public void givenPersonJsonArray_whenDeserializeWithJsonb_thenGetPersonList() {
+        Jsonb jsonb = JsonbBuilder.create();
+        // @formatter:off
+        String personJsonArray =
+            "[" + 
+                "{\"email\":\"jhon@test.com\"," + 
+                 "\"id\":1,\"person-name\":\"Jhon\"," + 
+                 "\"registeredDate\":\"09-09-2019\"," + 
+                 "\"salary\":\"1000.0\"}," +
+                "{\"email\":\"jhon1@test.com\"," +
+                 "\"id\":2,\"person-name\":\"Jhon\"," +
+                 "\"registeredDate\":\"09-09-2019\"," +
+                 "\"salary\":\"1500.0\"},{\"email\":null," +
+                 "\"id\":3,\"person-name\":\"Jhon\"," +
+                 "\"registeredDate\":\"09-09-2019\"," +
+                 "\"salary\":\"1000.0\"}," +
+                "{\"email\":\"tom@test.com\"," +
+                 "\"id\":4,\"person-name\":\"Tom\"," +
+                 "\"registeredDate\":\"09-09-2019\"," +
+                 "\"salary\":\"1500.0\"}"
+                 + "]";
+        // @formatter:on        
+        @SuppressWarnings("serial")
+        List<Person> personList = jsonb.fromJson(personJsonArray, new ArrayList<Person>() {
+        }.getClass()
+            .getGenericSuperclass());
+        // @formatter:off
+        List<Person> personListExpected = Arrays.asList(
+            new Person(1, "Jhon", "jhon@test.com", 20, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1000)), 
+            new Person(2, "Jhon", "jhon1@test.com", 20, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1500)), 
+            new Person(3, "Jhon", null, 20, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1000)),  
+            new Person(4, "Tom", "tom@test.com", 21, LocalDate.of(2019, 9, 9), BigDecimal.valueOf(1500)));            
+        // @formatter:on
+        assertTrue(ListUtils.isEqualList(personList, personListExpected));
+    }
+
+    @Test
+    public void givenPersonObject_whenNamingStrategy_thenGetCustomPersonJson() {
+        JsonbConfig config = new JsonbConfig().withPropertyNamingStrategy(PropertyNamingStrategy.LOWER_CASE_WITH_UNDERSCORES);
+        Jsonb jsonb = JsonbBuilder.create(config);
+        Person person = new Person(1, "Jhon", "jhon@test.com", 20, LocalDate.of(2019, 9, 7), BigDecimal.valueOf(1000));
+        String jsonPerson = jsonb.toJson(person);
+        // @formatter:off
+        String jsonExpected = 
+            "{\"email\":\"jhon@test.com\"," +
+             "\"id\":1," +
+             "\"person-name\":\"Jhon\"," +
+             "\"registered_date\":\"07-09-2019\"," +
+             "\"salary\":\"1000.0\"}";
+        // @formatter:on
+        assertTrue(jsonExpected.equals(jsonPerson));
+    }
+
+    @Test
+    public void givenPersonObject_whenWithPropertyOrderStrategy_thenGetReversePersonJson() {
+        JsonbConfig config = new JsonbConfig().withPropertyOrderStrategy(PropertyOrderStrategy.REVERSE);
+        Jsonb jsonb = JsonbBuilder.create(config);
+        Person person = new Person(1, "Jhon", "jhon@test.com", 20, LocalDate.of(2019, 9, 7), BigDecimal.valueOf(1000));
+        String jsonPerson = jsonb.toJson(person);
+        // @formatter:off
+        String jsonExpected = 
+            "{\"salary\":\"1000.0\","+
+             "\"registeredDate\":\"07-09-2019\"," +
+             "\"person-name\":\"Jhon\"," +
+             "\"id\":1," +
+             "\"email\":\"jhon@test.com\"}";
+        // @formatter:on
+        assertTrue(jsonExpected.equals(jsonPerson));
+    }
+
+    @Test
+    public void givenPersonObject_whenSerializeWithJsonb_thenGetPersonJson() {
+        Jsonb jsonb = JsonbBuilder.create();
+        Person person = new Person(1, "Jhon", "jhon@test.com", 20, LocalDate.of(2019, 9, 7), BigDecimal.valueOf(1000));
+        String jsonPerson = jsonb.toJson(person);
+        // @formatter:off
+        String jsonExpected = 
+            "{\"email\":\"jhon@test.com\"," +
+             "\"id\":1," +
+             "\"person-name\":\"Jhon\"," +
+             "\"registeredDate\":\"07-09-2019\"," +
+             "\"salary\":\"1000.0\"}";
+        // @formatter:on
+        assertTrue(jsonExpected.equals(jsonPerson));
+    }
+
+    @Test
+    public void givenPersonJson_whenDeserializeWithJsonb_thenGetPersonObject() {
+        Jsonb jsonb = JsonbBuilder.create();
+        Person person = new Person(1, "Jhon", "jhon@test.com", 0, LocalDate.of(2019, 9, 7), BigDecimal.valueOf(1000.0));
+        // @formatter:off
+        String jsonPerson = 
+            "{\"email\":\"jhon@test.com\"," + 
+             "\"id\":1," + 
+             "\"person-name\":\"Jhon\"," + 
+             "\"registeredDate\":\"07-09-2019\"," + 
+             "\"salary\":\"1000.0\"}";
+        // @formatter:on
+        assertTrue(jsonb.fromJson(jsonPerson, Person.class)
+            .equals(person));
+    }
+
+    @Test
+    public void givenPersonObject_whenSerializeWithAdapter_thenGetPersonJson() {
+        JsonbConfig config = new JsonbConfig().withAdapters(new PersonAdapter());
+        Jsonb jsonb = JsonbBuilder.create(config);
+        Person person = new Person(1, "Jhon", "jhon@test.com", 0, LocalDate.of(2019, 9, 7), BigDecimal.valueOf(1000.0));// new Person(1, "Jhon");
+        String jsonPerson = jsonb.toJson(person);
+        // @formatter:off
+        String jsonExpected = 
+            "{\"id\":1," +
+             "\"name\":\"Jhon\"}";
+        // @formatter:on
+        assertTrue(jsonExpected.equals(jsonPerson));
+    }
+
+    @Test
+    public void givenPersonJson_whenDeserializeWithAdapter_thenGetPersonObject() {
+        JsonbConfig config = new JsonbConfig().withAdapters(new PersonAdapter());
+        Jsonb jsonb = JsonbBuilder.create(config);
+        Person person = new Person(1, "Jhon", "jhon@test.com", 0, LocalDate.of(2019, 9, 7), BigDecimal.valueOf(1000.0));// new Person(1, "Jhon");
+        // @formatter:off
+        String jsonPerson = 
+            "{\"id\":1," +
+             "\"name\":\"Jhon\"}";
+        // @formatter:on
+        assertTrue(jsonb.fromJson(jsonPerson, Person.class)
+            .equals(person));
+    }
+
+}

json/src/test/java/com/baeldung/jsonjava/CDLIntegrationTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.jsonjava;
+
+import static org.junit.Assert.assertEquals;
+
+import org.json.CDL;
+import org.json.JSONArray;
+import org.json.JSONTokener;
+import org.junit.Test;
+
+public class CDLIntegrationTest {
+    @Test
+    public void givenCommaDelimitedText_thenConvertToJSONArray() {
+        JSONArray ja = CDL.rowToJSONArray(new JSONTokener("England, USA, Canada"));
+        assertEquals("[\"England\",\"USA\",\"Canada\"]", ja.toString());
+    }
+
+    @Test
+    public void givenJSONArray_thenConvertToCommaDelimitedText() {
+        JSONArray ja = new JSONArray("[\"England\",\"USA\",\"Canada\"]");
+        String cdt = CDL.rowToString(ja);
+        assertEquals("England,USA,Canada", cdt.toString().trim());
+    }
+
+    @Test
+    public void givenCommaDelimitedText_thenGetJSONArrayOfJSONObjects() {
+        String string = 
+          "name, city, age \n" +
+          "john, chicago, 22 \n" +
+          "gary, florida, 35 \n" +
+          "sal, vegas, 18";
+         
+        JSONArray result = CDL.toJSONArray(string);
+        assertEquals("[{\"name\":\"john\",\"city\":\"chicago\",\"age\":\"22\"},{\"name\":\"gary\",\"city\":\"florida\",\"age\":\"35\"},{\"name\":\"sal\",\"city\":\"vegas\",\"age\":\"18\"}]", result.toString());
+    }
+
+    @Test
+    public void givenCommaDelimitedText_thenGetJSONArrayOfJSONObjects2() {
+        JSONArray ja = new JSONArray();
+        ja.put("name");
+        ja.put("city");
+        ja.put("age");
+         
+        String string = 
+          "john, chicago, 22 \n" +
+          "gary, florida, 35 \n" +
+          "sal, vegas, 18";
+         
+        JSONArray result = CDL.toJSONArray(ja, string);
+        assertEquals("[{\"name\":\"john\",\"city\":\"chicago\",\"age\":\"22\"},{\"name\":\"gary\",\"city\":\"florida\",\"age\":\"35\"},{\"name\":\"sal\",\"city\":\"vegas\",\"age\":\"18\"}]", result.toString());
+    }
+    
+}

json/src/test/java/com/baeldung/jsonjava/CookieIntegrationTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.jsonjava;
+
+import static org.junit.Assert.assertEquals;
+
+import org.json.Cookie;
+import org.json.JSONObject;
+import org.junit.Test;
+
+public class CookieIntegrationTest {
+    @Test
+    public void givenCookieString_thenConvertToJSONObject() {
+        String cookie = "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC; path=/";
+        JSONObject cookieJO = Cookie.toJSONObject(cookie);
+
+        assertEquals("{\"path\":\"/\",\"expires\":\"Thu, 18 Dec 2013 12:00:00 UTC\",\"name\":\"username\",\"value\":\"John Doe\"}", cookieJO.toString());
+    }
+    
+    @Test
+    public void givenJSONObject_thenConvertToCookieString() {
+        JSONObject cookieJO = new JSONObject();
+        cookieJO.put("name", "username");
+        cookieJO.put("value", "John Doe");
+        cookieJO.put("expires", "Thu, 18 Dec 2013 12:00:00 UTC");
+        cookieJO.put("path", "/");
+        String cookie = Cookie.toString(cookieJO);
+
+        assertEquals("username=John Doe;expires=Thu, 18 Dec 2013 12:00:00 UTC;path=/", cookie.toString());
+    }
+}

json/src/test/java/com/baeldung/jsonjava/HTTPIntegrationTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.jsonjava;
+
+import static org.junit.Assert.assertEquals;
+import org.json.HTTP;
+import org.json.JSONObject;
+import org.junit.Test;
+
+public class HTTPIntegrationTest {
+    @Test
+    public void givenJSONObject_thenConvertToHTTPHeader() {
+        JSONObject jo = new JSONObject();
+        jo.put("Method", "POST");
+        jo.put("Request-URI", "http://www.example.com/");
+        jo.put("HTTP-Version", "HTTP/1.1");
+        
+        assertEquals("POST \"http://www.example.com/\" HTTP/1.1"+HTTP.CRLF+HTTP.CRLF, HTTP.toString(jo));
+    }
+
+    @Test
+    public void givenHTTPHeader_thenConvertToJSONObject() {
+        JSONObject obj = HTTP.toJSONObject("POST \"http://www.example.com/\" HTTP/1.1");
+        
+        assertEquals("{\"Request-URI\":\"http://www.example.com/\",\"Method\":\"POST\",\"HTTP-Version\":\"HTTP/1.1\"}", obj.toString());
+    }
+}

json/src/test/java/com/baeldung/jsonjava/JSONArrayGetValueByKeyUnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.jsonjava;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertThat;
+import static org.hamcrest.CoreMatchers.equalTo;
+
+public class JSONArrayGetValueByKeyUnitTest {
+
+    private static final JSONArrayGetValueByKey obj = new JSONArrayGetValueByKey();
+
+    @Test
+    public void givenJSONArrayAndAKey_thenReturnAllValuesForGivenKey() {
+        String jsonStr = "[" + " {" + " \"name\": \"John\"," + " \"city\": \"chicago\"," + " \"age\": \"22\" " + "}," + " { " + "\"name\": \"Gary\"," + " \"city\": \"florida\"," + " \"age\": \"35\" " + "}," + " { " + "\"name\": \"Selena\","
+            + " \"city\": \"vegas\"," + " \"age\": \"18\" " + "} " + "]";
+
+        List<String> actualValues = obj.getValuesByKeyInJSONArray(jsonStr, "name");
+
+        assertThat(actualValues, equalTo(Arrays.asList("John", "Gary", "Selena")));
+    }
+
+    @Test
+    public void givenJSONArrayAndAKey_whenUsingJava8Syntax_thenReturnAllValuesForGivenKey() {
+        String jsonStr = "[" + " {" + " \"name\": \"John\"," + " \"city\": \"chicago\"," + " \"age\": \"22\" " + "}," + " { " + "\"name\": \"Gary\"," + " \"city\": \"florida\"," + " \"age\": \"35\" " + "}," + " { " + "\"name\": \"Selena\","
+            + " \"city\": \"vegas\"," + " \"age\": \"18\" " + "} " + "]";
+
+        List<String> actualValues = obj.getValuesByKeyInJSONArrayUsingJava8(jsonStr, "name");
+
+        assertThat(actualValues, equalTo(Arrays.asList("John", "Gary", "Selena")));
+    }
+
+}

json/src/test/java/com/baeldung/jsonjava/JSONArrayIntegrationTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.jsonjava;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.junit.Test;
+
+public class JSONArrayIntegrationTest {
+    @Test
+    public void givenJSONJava_thenCreateNewJSONArrayFromScratch() {
+        JSONArray ja = new JSONArray();
+        ja.put(Boolean.TRUE);
+        ja.put("lorem ipsum");
+         
+        // We can also put a JSONObject in JSONArray
+        JSONObject jo = new JSONObject();
+        jo.put("name", "jon doe");
+        jo.put("age", "22");
+        jo.put("city", "chicago");
+         
+        ja.put(jo);
+         
+        assertEquals("[true,\"lorem ipsum\",{\"city\":\"chicago\",\"name\":\"jon doe\",\"age\":\"22\"}]", ja.toString());
+    }
+    
+    @Test
+    public void givenJsonString_thenCreateNewJSONArray() {
+        JSONArray ja = new JSONArray("[true, \"lorem ipsum\", 215]");
+        assertEquals("[true,\"lorem ipsum\",215]", ja.toString());
+    }
+
+    @Test
+    public void givenListObject_thenConvertItToJSONArray() {
+        List<String> list = new ArrayList<>();
+        list.add("California");
+        list.add("Texas");
+        list.add("Hawaii");
+        list.add("Alaska");
+         
+        JSONArray ja = new JSONArray(list);
+        assertEquals("[\"California\",\"Texas\",\"Hawaii\",\"Alaska\"]", ja.toString());
+    }
+}

json/src/test/java/com/baeldung/jsonjava/JSONObjectIntegrationTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.jsonjava;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.json.JSONObject;
+import org.junit.Test;
+
+public class JSONObjectIntegrationTest {
+    @Test
+    public void givenJSONJava_thenCreateNewJSONObject() {
+        JSONObject jo = new JSONObject();
+        jo.put("name", "jon doe");
+        jo.put("age", "22");
+        jo.put("city", "chicago");
+             
+        assertEquals("{\"city\":\"chicago\",\"name\":\"jon doe\",\"age\":\"22\"}", jo.toString());
+        
+    }
+
+    @Test
+    public void givenMapObject_thenCreateJSONObject() {
+        Map<String, String> map = new HashMap<>();
+        map.put("name", "jon doe");
+        map.put("age", "22");
+        map.put("city", "chicago");
+        JSONObject jo = new JSONObject(map);
+         
+        assertEquals("{\"name\":\"jon doe\",\"city\":\"chicago\",\"age\":\"22\"}", jo.toString());
+    }
+
+    @Test
+    public void givenJsonString_thenCreateJSONObject() {
+        JSONObject jo = new JSONObject(
+          "{\"city\":\"chicago\",\"name\":\"jon doe\",\"age\":\"22\"}"
+        );
+        
+        assertEquals("{\"city\":\"chicago\",\"name\":\"jon doe\",\"age\":\"22\"}", jo.toString());
+    }
+}

json/src/test/java/com/baeldung/jsonjava/JSONTokenerIntegrationTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.jsonjava;
+
+import static org.junit.Assert.assertEquals;
+
+import org.json.JSONTokener;
+import org.junit.Test;
+
+public class JSONTokenerIntegrationTest {
+    @Test
+    public void givenString_convertItToJSONTokens() {
+        String str = "Sample String";
+        JSONTokener jt = new JSONTokener(str);
+        
+        char[] expectedTokens = str.toCharArray();
+        int index = 0;
+        
+        while(jt.more()) {
+            assertEquals(expectedTokens[index++], jt.next());
+        }
+    }
+}

json/src/test/java/com/baeldung/jsonjava/ObjectToFromJSONIntegrationTest.java

@@ -0,0 +1,19 @@
+package com.baeldung.jsonjava;
+
+import static org.junit.Assert.assertEquals;
+
+import org.json.JSONObject;
+import org.junit.Test;
+
+public class ObjectToFromJSONIntegrationTest {
+    @Test
+    public void givenDemoBean_thenCreateJSONObject() {
+        DemoBean demo = new DemoBean();
+        demo.setId(1);
+        demo.setName("lorem ipsum");
+        demo.setActive(true);
+         
+        JSONObject jo = new JSONObject(demo);
+        assertEquals("{\"name\":\"lorem ipsum\",\"active\":true,\"id\":1}", jo.toString());
+    }
+}

json/src/test/java/com/baeldung/jsonobject/iterate/JSONObjectIteratorUnitTest.java

@@ -0,0 +1,79 @@
+package com.baeldung.jsonobject.iterate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Map;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.junit.Test;
+
+public class JSONObjectIteratorUnitTest {
+
+    private JSONObjectIterator jsonObjectIterator = new JSONObjectIterator();
+
+    @Test
+    public void givenJSONObject_whenIterating_thenGetKeyValuePairs() {
+        JSONObject jsonObject = getJsonObject();
+
+        jsonObjectIterator.handleJSONObject(jsonObject);
+
+        Map<String, Object> keyValuePairs = jsonObjectIterator.getKeyValuePairs();
+        assertThat(keyValuePairs.get("rType")).isEqualTo("Regular");
+        assertThat(keyValuePairs.get("rId")).isEqualTo("1001");
+        assertThat(keyValuePairs.get("cType")).isEqualTo("Chocolate");
+        assertThat(keyValuePairs.get("cId")).isEqualTo("1002");
+        assertThat(keyValuePairs.get("bType")).isEqualTo("BlueBerry");
+        assertThat(keyValuePairs.get("bId")).isEqualTo("1003");
+        assertThat(keyValuePairs.get("name")).isEqualTo("Cake");
+        assertThat(keyValuePairs.get("cakeId")).isEqualTo("0001");
+        assertThat(keyValuePairs.get("type")).isEqualTo("donut");
+        assertThat(keyValuePairs.get("Type")).isEqualTo("Maple");
+        assertThat(keyValuePairs.get("tId")).isEqualTo("5001");
+        assertThat(keyValuePairs.get("batters")
+            .toString()).isEqualTo("[{\"rType\":\"Regular\",\"rId\":\"1001\"},{\"cType\":\"Chocolate\",\"cId\":\"1002\"},{\"bType\":\"BlueBerry\",\"bId\":\"1003\"}]");
+        assertThat(keyValuePairs.get("cakeShapes")
+            .toString()).isEqualTo("[\"square\",\"circle\",\"heart\"]");
+        assertThat(keyValuePairs.get("topping")
+            .toString()).isEqualTo("{\"Type\":\"Maple\",\"tId\":\"5001\"}");
+    }
+
+    private JSONObject getJsonObject() {
+        JSONObject cake = new JSONObject();
+        cake.put("cakeId", "0001");
+        cake.put("type", "donut");
+        cake.put("name", "Cake");
+
+        JSONArray batters = new JSONArray();
+        JSONObject regular = new JSONObject();
+        regular.put("rId", "1001");
+        regular.put("rType", "Regular");
+        batters.put(regular);
+        JSONObject chocolate = new JSONObject();
+        chocolate.put("cId", "1002");
+        chocolate.put("cType", "Chocolate");
+        batters.put(chocolate);
+        JSONObject blueberry = new JSONObject();
+        blueberry.put("bId", "1003");
+        blueberry.put("bType", "BlueBerry");
+        batters.put(blueberry);
+
+        JSONArray cakeShapes = new JSONArray();
+        cakeShapes.put("square");
+        cakeShapes.put("circle");
+        cakeShapes.put("heart");
+
+        cake.put("cakeShapes", cakeShapes);
+
+        cake.put("batters", batters);
+
+        JSONObject topping = new JSONObject();
+        topping.put("tId", "5001");
+        topping.put("Type", "Maple");
+
+        cake.put("topping", topping);
+
+        return cake;
+    }
+
+}

json/src/test/java/com/baeldung/jsonpointer/JsonPointerCrudUnitTest.java

@@ -0,0 +1,59 @@
+package com.baeldung.jsonpointer;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class JsonPointerCrudUnitTest {
+
+    @Test
+    public void testJsonPointerCrudForAddress() {
+
+        JsonPointerCrud jsonPointerCrud = new JsonPointerCrud(JsonPointerCrudUnitTest.class.getResourceAsStream("/address.json"));
+
+        assertFalse(jsonPointerCrud.check("city"));
+
+        // insert a value
+        jsonPointerCrud.insert("city", "Rio de Janeiro");
+
+        assertTrue(jsonPointerCrud.check("city"));
+
+        // fetch full json
+        String fullJSON = jsonPointerCrud.fetchFullJSON();
+
+        assertTrue(fullJSON.contains("name"));
+
+        assertTrue(fullJSON.contains("city"));
+
+        // fetch value
+        String cityName = jsonPointerCrud.fetchValueFromKey("city");
+
+        assertEquals(cityName, "Rio de Janeiro");
+
+        // update value
+        jsonPointerCrud.update("city", "Sao Paulo");
+
+        // fetch value
+        cityName = jsonPointerCrud.fetchValueFromKey("city");
+
+        assertEquals(cityName, "Sao Paulo");
+
+        // delete
+        jsonPointerCrud.delete("city");
+
+        assertFalse(jsonPointerCrud.check("city"));
+
+    }
+
+    @Test
+    public void testJsonPointerCrudForBooks() {
+
+        JsonPointerCrud jsonPointerCrud = new JsonPointerCrud(JsonPointerCrudUnitTest.class.getResourceAsStream("/books.json"));
+
+        // fetch value
+        String book = jsonPointerCrud.fetchListValues("books/1");
+
+        assertEquals(book, "{\"title\":\"Title 2\",\"author\":\"John Doe\"}");
+
+    }
+}