diff --git a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/funderresult/SplitPerFunderTest.java b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/funderresult/SplitPerFunderTest.java
index 71bf5d942..eefb0b9cb 100644
--- a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/funderresult/SplitPerFunderTest.java
+++ b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/dump/funderresult/SplitPerFunderTest.java
@@ -137,5 +137,11 @@ public class SplitPerFunderTest {
 			.map(item -> OBJECT_MAPPER.readValue(item, CommunityResult.class));
 		Assertions.assertEquals(3, tmp.count());
 
+		// MZOS 1
+		tmp = sc
+				.textFile(workingDir.toString() + "/split/MZOS")
+				.map(item -> OBJECT_MAPPER.readValue(item, CommunityResult.class));
+		Assertions.assertEquals(1, tmp.count());
+
 	}
 }