unittests enhancement

src/test/java/pta/de/core/common/GsonUTCDateAdapterTest.java

diff --git a/src/test/java/pta/de/core/common/GsonUTCDateAdapterTest.java b/src/test/java/pta/de/core/common/GsonUTCDateAdapterTest.java
new file mode 100644
index 0000000..52f1330
--- /dev/null
+++ b/src/test/java/pta/de/core/common/GsonUTCDateAdapterTest.java
@@ -0,0 +1,38 @@
+package pta.de.core.common;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonSerializationContext;
+import org.junit.Test;
+
+import java.lang.reflect.Type;
+import java.util.Calendar;
+
+public class GsonUTCDateAdapterTest {
+
+    @Test
+    public void serializeTest() {
+        GsonUTCDateAdapter gsonUTCDateAdapter = new GsonUTCDateAdapter();
+        Calendar calendar = Calendar.getInstance();
+        java.util.Date date = calendar.getTime();
+        Type type = new Type() {
+            @Override
+            public String getTypeName() {
+                return null;
+            }
+        };
+        JsonSerializationContext jsonSerializationContext = new JsonSerializationContext() {
+            @Override
+            public JsonElement serialize(Object o) {
+                return null;
+            }
+
+            @Override
+            public JsonElement serialize(Object o, Type type) {
+                return null;
+            }
+        };
+
+        gsonUTCDateAdapter.serialize(date, type, jsonSerializationContext);
+    }
+
+}