diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@
 `elm-street` uses [PVP Versioning][1].
 The changelog is available [on GitHub][2].
 
+## 0.2.1.1 - Aug 3, 2023
+* Add missing extra-source-files: test/golden/oneType.json to cabal
+
 ## 0.2.1.0 - Aug 3, 2023
 
 * Add GHC 9.4.5 and 9.6.2 to CI / tested-with
diff --git a/elm-street.cabal b/elm-street.cabal
--- a/elm-street.cabal
+++ b/elm-street.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.4
 name:                elm-street
-version:             0.2.1.0
+version:             0.2.1.1
 synopsis:            Crossing the road between Haskell and Elm
 description:
     `Elm-street` allows you to generate automatically derived from Haskell types
@@ -18,6 +18,7 @@
 build-type:          Simple
 extra-doc-files:     README.md
                      CHANGELOG.md
+extra-source-files:  test/golden/oneType.json
 tested-with:         GHC == 8.10.7
                      GHC == 9.0.2
                      GHC == 9.2.8
diff --git a/test/golden/oneType.json b/test/golden/oneType.json
new file mode 100644
--- /dev/null
+++ b/test/golden/oneType.json
@@ -0,0 +1,104 @@
+{
+    "tag": "OneType",
+    "prims": {
+        "maybe": 12,
+        "list": [
+            1,
+            2,
+            3,
+            4,
+            5
+        ],
+        "tag": "Prims",
+        "time": "2019-02-22T00:00:00Z",
+        "text": "heh",
+        "string": "bye",
+        "result": {
+            "Left": 666
+        },
+        "pair": [
+            "o",
+            false
+        ],
+        "triple": [
+            "o",
+            false,
+            [0]
+        ],
+        "float": 36.6,
+        "char": "a",
+        "int": 42,
+        "bool": true,
+        "unit": [],
+        "nonEmpty": [1],
+        "value": {
+            "boolField": true,
+            "numberField": 1,
+            "stringField": "hi",
+            "objectField": {},
+            "arrayField": [1,2,3],
+            "nullField": null
+        }
+    },
+    "myUnit": {
+        "tag": "MyUnit",
+        "contents": []
+    },
+    "myResult": {
+        "tag": "Err",
+        "contents": "clashing test"
+    },
+    "userRequest": {
+        "tag": "UserRequest",
+        "example": {
+            "Right": {
+                "tag": "Blocked"
+            }
+        },
+        "ids": [
+            "1",
+            "2"
+        ],
+        "limit": 123
+    },
+    "age": 18,
+    "newtype": 666,
+    "newtypeList": [123],
+    "oneConstructor": "OneConstructor",
+    "user": {
+        "status": "Approved",
+        "tag": "User",
+        "age": 100,
+        "name": "not-me",
+        "id": "1"
+    },
+    "id": "myId",
+    "requestStatus": "Reviewing",
+    "guests": [
+        {
+            "tag": "Regular",
+            "contents": [
+                "nice",
+                7
+            ]
+        },
+        {
+            "tag": "Visitor",
+            "contents": "new-guest"
+        },
+        {
+            "tag": "Blocked"
+        }
+    ],
+    "nonEmpty": [
+        {
+            "tag": "MyUnit",
+            "contents": []
+        },
+        {
+            "tag": "MyUnit",
+            "contents": []
+        }
+    ]
+}
+