diff --git a/partial-response/pom.xml b/partial-response/pom.xml
index e4f4db4ae..7ce36ecec 100644
--- a/partial-response/pom.xml
+++ b/partial-response/pom.xml
@@ -15,6 +15,10 @@
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+        </dependency>
     </dependencies>
 
 
diff --git a/partial-response/src/main/java/com/iluwatar/partialresponse/FieldJsonMapper.java b/partial-response/src/main/java/com/iluwatar/partialresponse/FieldJsonMapper.java
new file mode 100644
index 000000000..32e9ae83d
--- /dev/null
+++ b/partial-response/src/main/java/com/iluwatar/partialresponse/FieldJsonMapper.java
@@ -0,0 +1,31 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Gopinath Langote
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.iluwatar.partialresponse;
+
+public class FieldJsonMapper {
+  public String toJson(Video video, String[] fields) {
+    return null;
+  }
+}
diff --git a/partial-response/src/main/java/com/iluwatar/partialresponse/VideoResource.java b/partial-response/src/main/java/com/iluwatar/partialresponse/VideoResource.java
index b233c42d3..8c571e6d6 100644
--- a/partial-response/src/main/java/com/iluwatar/partialresponse/VideoResource.java
+++ b/partial-response/src/main/java/com/iluwatar/partialresponse/VideoResource.java
@@ -27,13 +27,18 @@ package com.iluwatar.partialresponse;
 import java.util.Map;
 
 public class VideoResource {
+  private FieldJsonMapper fieldJsonMapper;
   private Map<Integer, Video> videos;
 
-  public VideoResource(Map<Integer, Video> videos) {
+  public VideoResource(FieldJsonMapper fieldJsonMapper, Map<Integer, Video> videos) {
+    this.fieldJsonMapper = fieldJsonMapper;
     this.videos = videos;
   }
 
-  public String getDetails(Integer id) {
-    return videos.get(id).toString();
+  public String getDetails(Integer id, String... fields) {
+    if (fields.length == 0) {
+      return videos.get(id).toString();
+    }
+    return fieldJsonMapper.toJson(videos.get(id), fields);
   }
 }
diff --git a/partial-response/src/test/java/com/iluwatar/partialresponse/VideoResourceTest.java b/partial-response/src/test/java/com/iluwatar/partialresponse/VideoResourceTest.java
index 329b10087..df25c2dea 100644
--- a/partial-response/src/test/java/com/iluwatar/partialresponse/VideoResourceTest.java
+++ b/partial-response/src/test/java/com/iluwatar/partialresponse/VideoResourceTest.java
@@ -26,13 +26,23 @@ package com.iluwatar.partialresponse;
 
 import org.junit.Before;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
 
 import java.util.HashMap;
 import java.util.Map;
 
 import static org.junit.Assert.assertEquals;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.when;
 
+@RunWith(MockitoJUnitRunner.class)
 public class VideoResourceTest {
+  @Mock
+  private FieldJsonMapper fieldJsonMapper;
+
   private VideoResource resource;
 
   @Before
@@ -41,14 +51,26 @@ public class VideoResourceTest {
     videos.put(1, new Video(1, "Avatar", 178, "epic science fiction film", "James Cameron", "English"));
     videos.put(2, new Video(2, "Godzilla Resurgence", 120, "Action & drama movie|", "Hideaki Anno", "Japanese"));
     videos.put(3, new Video(3, "Interstellar", 169, "Adventure & Sci-Fi", "Christopher Nolan", "English"));
-    resource = new VideoResource(videos);
+    resource = new VideoResource(fieldJsonMapper, videos);
   }
 
   @Test
   public void shouldGiveVideoDetailsById() {
-    String details = resource.getDetails(1);
+    String actualDetails = resource.getDetails(1);
 
     String expectedDetails = "{\"id\": \"1\",\"title\": \"Avatar\",\"length\": 178,\"description\": \"epic science fiction film\",\"director\": \"James Cameron\",\"language\": \"English\",}";
-    assertEquals(expectedDetails, details);
+    assertEquals(expectedDetails, actualDetails);
+  }
+
+  @Test
+  public void shouldGiveSpecifiedFieldsInformationOfVideo() {
+    String[] fields = new String[]{"title", "length"};
+
+    String expectedDetails = "{\"id\": \"1\",\"title\": \"Avatar\",\"length\": 178}";
+    when(fieldJsonMapper.toJson(any(Video.class), eq(fields))).thenReturn(expectedDetails);
+
+    String actualFieldsDetails = resource.getDetails(2, fields);
+
+    assertEquals(expectedDetails, actualFieldsDetails);
   }
 }
\ No newline at end of file