diff --git a/scripts/generate_code.py b/scripts/generate_code.py
index 7111d8d..dd84cfd 100755
--- a/scripts/generate_code.py
+++ b/scripts/generate_code.py
@@ -147,7 +147,7 @@
 LOBSTER_OPTS = ["--lobster"]
 SWIFT_OPTS = ["--swift", "--gen-json-emit", "--bfbs-filenames", str(tests_path)]
 SWIFT_OPTS_CODE_GEN = [
-    "--swift", 
+    "--swift",
     "--gen-json-emit",
     "--bfbs-filenames",
     swift_code_gen
@@ -305,14 +305,14 @@
 
 # Generate the annotated binary of the monster_test binary schema.
 flatc_annotate(
-    schema="../reflection/reflection.fbs", 
-    file="monster_test.bfbs", 
+    schema="../reflection/reflection.fbs",
+    file="monster_test.bfbs",
     include="include_test"
 )
 
 flatc_annotate(
-    schema="monster_test.fbs", 
-    file="monsterdata_test.mon", 
+    schema="monster_test.fbs",
+    file="monsterdata_test.mon",
     include="include_test"
 )
 
@@ -371,6 +371,12 @@
 )
 
 
+flatc(
+    BASE_OPTS + PYTHON_OPTS,
+    schema="nested_union_test.fbs",
+)
+
+
 # Optional Scalars
 optional_scalars_schema = "optional_scalars.fbs"
 flatc(["--java", "--kotlin", "--lobster"], schema=optional_scalars_schema)
@@ -449,6 +455,13 @@
     cwd=swift_code_gen
 )
 
+# Nim Tests
+NIM_OPTS = BASE_OPTS + ["--nim"]
+flatc(NIM_OPTS, schema="monster_test.fbs", include="include_test")
+flatc(NIM_OPTS, schema="optional_scalars.fbs")
+flatc(NIM_OPTS, schema="more_defaults.fbs")
+flatc(NIM_OPTS, schema="MutatingBool.fbs")
+
 # --filename-suffix and --filename-ext tests
 flatc(
     CPP_OPTS + NO_INCL_OPTS + ["--grpc", "--filename-ext", "hpp"],