diff --git a/lib/go/test/ConstOptionalField.thrift b/lib/go/test/ConstOptionalField.thrift
new file mode 100644
index 0000000..dc1df8f
--- /dev/null
+++ b/lib/go/test/ConstOptionalField.thrift
@@ -0,0 +1,111 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+namespace go constoptionalfieldb
+
+include "ConstOptionalFieldImport.thrift"
+
+typedef ConstOptionalFieldImport.Foo TypedefBFoo
+
+typedef bool TypedefBBool
+typedef i8 TypedefBI8
+typedef i16 TypedefBI16
+typedef i32 TypedefBI32
+typedef i64 TypedefBI64
+typedef double TypedefBDouble
+typedef string TypedefBString
+typedef binary TypedefBBinary
+
+struct Bar {
+  1: optional ConstOptionalFieldImport.Foo optFoo,
+  2: optional ConstOptionalFieldImport.TypedefAFoo aFoo,
+  3: optional TypedefBFoo bFoo,
+
+  4: optional bool optBool,
+  5: optional ConstOptionalFieldImport.TypedefABool aBool,
+  6: optional TypedefBBool bBool,
+
+  7: optional i8 optI8,
+  8: optional ConstOptionalFieldImport.TypedefAI8 aI8,
+  9: optional TypedefBI8 bI8,
+
+  10: optional i16 optI16,
+  11: optional ConstOptionalFieldImport.TypedefAI16 aI16,
+  12: optional TypedefBI16 bI16,
+
+  13: optional i32 optI32,
+  14: optional ConstOptionalFieldImport.TypedefAI32 aI32,
+  15: optional TypedefBI32 bI32,
+
+  16: optional i64 optI64,
+  17: optional ConstOptionalFieldImport.TypedefAI64 aI64,
+  18: optional TypedefBI64 bI64,
+
+  19: optional double optDouble,
+  20: optional ConstOptionalFieldImport.TypedefADouble aDouble,
+  21: optional TypedefBDouble bDouble,
+
+  22: optional string optString,
+  23: optional ConstOptionalFieldImport.TypedefAString aString,
+  24: optional TypedefBString bString,
+
+  25: optional binary optBinary,
+  26: optional ConstOptionalFieldImport.TypedefABinary aBinary,
+  27: optional TypedefBBinary bBinary,
+}
+
+const list<Bar> CONSTANTS = [
+  {
+    "optFoo": ConstOptionalFieldImport.Foo.One,
+    "aFoo": ConstOptionalFieldImport.Foo.One,
+    "bFoo": ConstOptionalFieldImport.Foo.One,
+
+    "optBool": true,
+    "aBool": true,
+    "bBool": true,
+
+    "optI8": 8,
+    "aI8": 8,
+    "bI8": 8,
+
+    "optI16": 16,
+    "aI16": 16,
+    "bI16": 16,
+
+    "optI32": 32,
+    "aI32": 32,
+    "bI32": 32,
+
+    "optI64": 64,
+    "aI64": 64,
+    "bI64": 64,
+
+    "optDouble": 1234,
+    "aDouble": 1234,
+    "bDouble": 1234,
+
+    "optString": "string",
+    "aString": "string",
+    "bString": "string",
+
+    "optBinary": "binary",
+    "aBinary": "binary",
+    "bBinary": "binary",
+  },
+]