diff --git a/obitests/obitools/obisummary/some_uniq_seq.fasta b/obitests/obitools/obisummary/some_uniq_seq.fasta
new file mode 100644
index 0000000..651a0f5
--- /dev/null
+++ b/obitests/obitools/obisummary/some_uniq_seq.fasta
@@ -0,0 +1,9 @@
+>Seq_1 {"count":2,"merged_sample":{"15a_F730814":1,"29a_F260619":1}}
+ttagccctaaacacaagtaattaatataacaaaattattcgccagagtactaccggcaat
+agctyaaaactcaaaggacttggcggtgctttataccctt
+>Seq_2 {"count":22,"merged_sample":{"15a_F730814":12,"29a_F260619":10}}
+ttagccctaaacacaagtaattaatataacaaaattattcgccagagtactaccggcaat
+atcttaaaactcaaaggacttggcggtgctttataccctt
+>Seq_3 {"count":22,"merged_sample":{"15a_F730814":15,"29a_F260619":7}}
+ttagccctaaacacaagtaattaatataacaaaattattcgccagagtactaccggcgat
+agcttaaaactcaaaggacttggcggtgctttataccctt
diff --git a/obitests/obitools/obisummary/some_uniq_seq.json b/obitests/obitools/obisummary/some_uniq_seq.json
new file mode 100644
index 0000000..a756ab1
--- /dev/null
+++ b/obitests/obitools/obisummary/some_uniq_seq.json
@@ -0,0 +1,35 @@
+{
+  "annotations": {
+    "keys": {
+      "map": {
+        "merged_sample": 3
+      },
+      "scalar": {
+        "count": 3
+      }
+    },
+    "map_attributes": 1,
+    "scalar_attributes": 1,
+    "vector_attributes": 0
+  },
+  "count": {
+    "reads": 46,
+    "total_length": 300,
+    "variants": 3
+  },
+  "samples": {
+    "sample_count": 2,
+    "sample_stats": {
+      "15a_F730814": {
+        "reads": 28,
+        "singletons": 1,
+        "variants": 3
+      },
+      "29a_F260619": {
+        "reads": 18,
+        "singletons": 1,
+        "variants": 3
+      }
+    }
+  }
+}
diff --git a/obitests/obitools/obisummary/some_uniq_seq.yaml b/obitests/obitools/obisummary/some_uniq_seq.yaml
new file mode 100644
index 0000000..64b0b95
--- /dev/null
+++ b/obitests/obitools/obisummary/some_uniq_seq.yaml
@@ -0,0 +1,25 @@
+annotations:
+    keys:
+        map:
+            merged_sample: 3
+        scalar:
+            count: 3
+    map_attributes: 1
+    scalar_attributes: 1
+    vector_attributes: 0
+count:
+    reads: 46
+    total_length: 300
+    variants: 3
+samples:
+    sample_count: 2
+    sample_stats:
+        15a_F730814:
+            reads: 28
+            singletons: 1
+            variants: 3
+        29a_F260619:
+            reads: 18
+            singletons: 1
+            variants: 3
+
diff --git a/obitests/obitools/obisummary/test.sh b/obitests/obitools/obisummary/test.sh
index e4d4931..620366f 100755
--- a/obitests/obitools/obisummary/test.sh
+++ b/obitests/obitools/obisummary/test.sh
@@ -98,6 +98,49 @@ else
     ((failed++))
 fi
 
+((ntest++))
+if obisummary "${TEST_DIR}/some_uniq_seq.fasta" \
+              > "${TMPDIR}/some_uniq_seq.json"
+then
+    log "$MCMD: formating json execution OK" 
+    ((success++))
+else
+    log "$MCMD: formating json execution failed" 
+    ((failed++))
+fi
+
+((ntest++))
+if diff "${TEST_DIR}/some_uniq_seq.json" \
+        "${TMPDIR}/some_uniq_seq.json" > /dev/null
+then
+    log "$MCMD: formating json OK" 
+    ((success++))
+else
+    log "$MCMD: formating json failed" 
+    ((failed++))
+fi
+
+((ntest++))
+if obisummary --yaml "${TEST_DIR}/some_uniq_seq.fasta" \
+              > "${TMPDIR}/some_uniq_seq.yaml"
+then
+    log "$MCMD: formating yaml execution OK" 
+    ((success++))
+else
+    log "$MCMD: formating yaml execution failed" 
+    ((failed++))
+fi
+
+((ntest++))
+if diff "${TEST_DIR}/some_uniq_seq.yaml" \
+        "${TMPDIR}/some_uniq_seq.yaml" > /dev/null
+then
+    log "$MCMD: formating yaml OK" 
+    ((success++))
+else
+    log "$MCMD: formating yaml failed" 
+    ((failed++))
+fi
 
 #########################################
 #