diff --git a/gradoop-flink/src/test/java/org/gradoop/flink/io/impl/csv/CSVTestBase.java b/gradoop-flink/src/test/java/org/gradoop/flink/io/impl/csv/CSVTestBase.java
index ee397b62a026..f5e40a4469d4 100644
--- a/gradoop-flink/src/test/java/org/gradoop/flink/io/impl/csv/CSVTestBase.java
+++ b/gradoop-flink/src/test/java/org/gradoop/flink/io/impl/csv/CSVTestBase.java
@@ -143,6 +143,7 @@ protected void checkProperties(EPGMElement epgmElement) {
     assertTrue(epgmElement.hasProperty(GradoopTestUtils.KEY_c));
     assertTrue(epgmElement.hasProperty(GradoopTestUtils.KEY_d));
     assertTrue(epgmElement.hasProperty(GradoopTestUtils.KEY_e));
+    assertTrue(epgmElement.hasProperty(GradoopTestUtils.KEY_f));
 
     // assert that the properties have valid data types
     assertTrue(epgmElement.getPropertyValue(GradoopTestUtils.KEY_0).isBoolean());
@@ -160,6 +161,7 @@ protected void checkProperties(EPGMElement epgmElement) {
     assertTrue(epgmElement.getPropertyValue(GradoopTestUtils.KEY_c).isList());
     assertTrue(epgmElement.getPropertyValue(GradoopTestUtils.KEY_d).isList());
     assertTrue(epgmElement.getPropertyValue(GradoopTestUtils.KEY_e).isShort());
+    assertTrue(epgmElement.getPropertyValue(GradoopTestUtils.KEY_e).isNull());
 
     // assert that the properties have valid values
     assertEquals(epgmElement.getPropertyValue(GradoopTestUtils.KEY_0).getBoolean(),
@@ -192,6 +194,8 @@ protected void checkProperties(EPGMElement epgmElement) {
       PROPERTY_MAP.get(GradoopTestUtils.KEY_d));
     assertEquals(epgmElement.getPropertyValue(GradoopTestUtils.KEY_e).getShort(),
       PROPERTY_MAP.get(GradoopTestUtils.KEY_e));
+    assertEquals(epgmElement.getPropertyValue(GradoopTestUtils.KEY_f).getShort(),
+      PROPERTY_MAP.get(GradoopTestUtils.KEY_f));
   }
 
   /**
@@ -215,5 +219,6 @@ protected void checkMetadataCsvLine(String line) {
     assertTrue(line.contains(GradoopTestUtils.KEY_c + ":list:string"));
     assertTrue(line.contains(GradoopTestUtils.KEY_d + ":list:int"));
     assertTrue(line.contains(GradoopTestUtils.KEY_e + ":short"));
+    assertTrue(line.contains(GradoopTestUtils.KEY_f + ":null"));
   }
 }