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
index 52f1330..a1bb423 100644
--- a/src/test/java/pta/de/core/common/GsonUTCDateAdapterTest.java
+++ b/src/test/java/pta/de/core/common/GsonUTCDateAdapterTest.java
@@ -1,6 +1,8 @@
 package pta.de.core.common;
 
+import com.google.gson.JsonDeserializationContext;
 import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
 import com.google.gson.JsonSerializationContext;
 import org.junit.Test;
 
@@ -32,7 +34,21 @@
             }
         };
 
-        gsonUTCDateAdapter.serialize(date, type, jsonSerializationContext);
+        JsonElement je = gsonUTCDateAdapter.serialize(date, type, jsonSerializationContext);
+
+        // run through generator code base
+        JsonGeneratorBase.getGson();
+
+
+        JsonDeserializationContext jsonDeserializationContext = new JsonDeserializationContext() {
+            @Override
+            public <T> T deserialize(JsonElement jsonElement, Type type) throws JsonParseException {
+                return null;
+            }
+        };
+
+
+        gsonUTCDateAdapter.deserialize(je, type, jsonDeserializationContext);
     }
 
 }