diff --git a/api/tests/integration/tests/formats/ref/ket_with_custom_query.ket b/api/tests/integration/tests/formats/ref/ket_with_custom_query.ket
new file mode 100644
index 0000000000..0f324f83e8
--- /dev/null
+++ b/api/tests/integration/tests/formats/ref/ket_with_custom_query.ket
@@ -0,0 +1,123 @@
+{
+    "root": {
+        "nodes": [
+            {
+                "$ref": "mol0"
+            }
+        ]
+    },
+    "mol0": {
+        "type": "molecule",
+        "atoms": [
+            {
+                "label": "C",
+                "location": [
+                    6.3348493576049809,
+                    -5.550074577331543,
+                    0.0
+                ]
+            },
+            {
+                "label": "C",
+                "location": [
+                    8.06515121459961,
+                    -5.549589157104492,
+                    0.0
+                ]
+            },
+            {
+                "label": "C",
+                "location": [
+                    7.2016377449035648,
+                    -5.049966812133789,
+                    0.0
+                ]
+            },
+            {
+                "label": "C",
+                "location": [
+                    8.06515121459961,
+                    -6.55053186416626,
+                    0.0
+                ]
+            },
+            {
+                "label": "C",
+                "location": [
+                    6.3348493576049809,
+                    -6.555019855499268,
+                    0.0
+                ]
+            },
+            {
+                "label": "C",
+                "location": [
+                    7.203820705413818,
+                    -7.050033092498779,
+                    0.0
+                ],
+                "queryProperties": {
+                    "customQuery": "C&X3,N&X2"
+                }
+            }
+        ],
+        "bonds": [
+            {
+                "type": 2,
+                "atoms": [
+                    2,
+                    0
+                ]
+            },
+            {
+                "type": 2,
+                "atoms": [
+                    3,
+                    1
+                ]
+            },
+            {
+                "type": 1,
+                "atoms": [
+                    0,
+                    4
+                ]
+            },
+            {
+                "type": 1,
+                "atoms": [
+                    1,
+                    2
+                ]
+            },
+            {
+                "type": 2,
+                "atoms": [
+                    4,
+                    5
+                ]
+            },
+            {
+                "type": 1,
+                "atoms": [
+                    5,
+                    3
+                ]
+            }
+        ],
+        "sgroups": [
+            {
+                "type": "MUL",
+                "atoms": [
+                    0,
+                    1,
+                    2,
+                    3,
+                    4,
+                    5
+                ],
+                "mul": 1
+            }
+        ]
+    }
+}
\ No newline at end of file