diff --git a/test/fixtures/server.py b/test/fixtures/server.py
index 658f04b..5ef3b04 100644
--- a/test/fixtures/server.py
+++ b/test/fixtures/server.py
@@ -82,7 +82,7 @@ def core_operation(item_type, one_to_many, analysis_task):
             yield upper(string, metadata), metadata
 
     def upper(string: bytes, metadata):
-        return string.decode().upper().encode()
+        return string.decode().upper().encode(), metadata
 
     def extract(string: bytes, metadata):
         for c in project(dict(enumerate(string.decode())), metadata["pages"]).values():
@@ -90,7 +90,7 @@ def core_operation(item_type, one_to_many, analysis_task):
 
     def rotate(im: bytes, metadata):
         im = Image.open(io.BytesIO(im))
-        return image_to_bytes(im.rotate(90))
+        return image_to_bytes(im.rotate(90)), metadata
 
     def classify(_: bytes, metadata):
         return b"", {"classification": 1}
diff --git a/test/integration_tests/serve_test.py b/test/integration_tests/serve_test.py
index 48500aa..df6f103 100644
--- a/test/integration_tests/serve_test.py
+++ b/test/integration_tests/serve_test.py
@@ -29,7 +29,7 @@ from test.utils.input import pair_data_with_queue_message
 @pytest.mark.parametrize(
     "analysis_task",
     [
-        # False,
+        False,
         True,
     ],
 )
@@ -39,9 +39,9 @@ from test.utils.input import pair_data_with_queue_message
 @pytest.mark.parametrize(
     "item_type",
     [
-        # "string",
+        "string",
         "image",
-        # "pdf",
+        "pdf",
     ],
 )
 @pytest.mark.parametrize(