Fix FileIteratingFirehoseTest to extend NullHandlingTest (#11581)

diff --git a/core/src/test/java/org/apache/druid/data/input/impl/FileIteratingFirehoseTest.java b/core/src/test/java/org/apache/druid/data/input/impl/FileIteratingFirehoseTest.java
index 7683258..a1c64ad 100644
--- a/core/src/test/java/org/apache/druid/data/input/impl/FileIteratingFirehoseTest.java
+++ b/core/src/test/java/org/apache/druid/data/input/impl/FileIteratingFirehoseTest.java
@@ -22,6 +22,7 @@
 import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableList;
 import org.apache.commons.io.LineIterator;
+import org.apache.druid.common.config.NullHandlingTest;
 import org.apache.druid.data.input.InputRow;
 import org.junit.Assert;
 import org.junit.Test;
@@ -41,7 +42,7 @@
 import java.util.stream.IntStream;
 
 @RunWith(Parameterized.class)
-public class FileIteratingFirehoseTest
+public class FileIteratingFirehoseTest extends NullHandlingTest
 {
   @Parameters(name = "{0}, {1}")
   public static Collection<Object[]> constructorFeeder()