diff --git a/cmem_plugin_base/dataintegration/description.py b/cmem_plugin_base/dataintegration/description.py
index 8654493..f121e89 100644
--- a/cmem_plugin_base/dataintegration/description.py
+++ b/cmem_plugin_base/dataintegration/description.py
@@ -275,11 +275,11 @@ def __call__(self, func: type):
     def retrieve_parameters(self, plugin_class: type) -> list[PluginParameter]:
         """Retrieve parameters from a plugin class and matches them with the user parameter defs"""
         # Only return parameters for user-defined init methods.
-        if not hasattr(plugin_class.__init__, "__code__"): # type: ignore[misc]
+        if not hasattr(plugin_class.__init__, "__code__"):  # type: ignore[misc]
             return []
         # Collect parameters from init method
         params = []
-        sig = inspect.signature(plugin_class.__init__) # type: ignore[misc]
+        sig = inspect.signature(plugin_class.__init__)  # type: ignore[misc]
         for name in sig.parameters:
             if name != "self":
                 param = next((p for p in self.parameters if p.name == name), None)
diff --git a/cmem_plugin_base/dataintegration/parameter/choice.py b/cmem_plugin_base/dataintegration/parameter/choice.py
index fa41f49..8fe4638 100644
--- a/cmem_plugin_base/dataintegration/parameter/choice.py
+++ b/cmem_plugin_base/dataintegration/parameter/choice.py
@@ -26,7 +26,10 @@ def label(
         return self.choice_list[value]
 
     def autocomplete(
-        self, query_terms: list[str], depend_on_parameter_values: list[Any], context: PluginContext,
+        self,
+        query_terms: list[str],
+        depend_on_parameter_values: list[Any],
+        context: PluginContext,
     ) -> list[Autocompletion]:
         """Autocompletion request - Returns all results that match ALL provided query terms."""
         result = []
@@ -38,5 +41,5 @@ def autocomplete(
             for term in query_terms:
                 if term.lower() in label.lower():
                     result.append(Autocompletion(value=identifier, label=label))  # noqa: PERF401
-        result.sort(key=lambda x: x.label) # type: ignore[return-value, arg-type]
+        result.sort(key=lambda x: x.label)  # type: ignore[return-value, arg-type]
         return list(set(result))
diff --git a/cmem_plugin_base/dataintegration/utils/__init__.py b/cmem_plugin_base/dataintegration/utils/__init__.py
index 665f616..86fdff9 100644
--- a/cmem_plugin_base/dataintegration/utils/__init__.py
+++ b/cmem_plugin_base/dataintegration/utils/__init__.py
@@ -2,6 +2,7 @@
 
 import os
 import re
+from typing import IO
 
 from cmem.cmempy.workspace.projects.datasets.dataset import post_resource
 
@@ -70,7 +71,9 @@ def split_task_id(task_id: str) -> tuple:
     return project_part, task_part
 
 
-def write_to_dataset(dataset_id: str, file_resource=None, context: UserContext | None = None):
+def write_to_dataset(  # noqa: ANN201
+    dataset_id: str, file_resource: IO | None = None, context: UserContext | None = None
+):
     """Write to a dataset.
 
     Args:
diff --git a/cmem_plugin_base/dataintegration/utils/entity_builder.py b/cmem_plugin_base/dataintegration/utils/entity_builder.py
index 950b032..cd896ec 100644
--- a/cmem_plugin_base/dataintegration/utils/entity_builder.py
+++ b/cmem_plugin_base/dataintegration/utils/entity_builder.py
@@ -133,10 +133,10 @@ def _get_entity(
             values.append(
                 [f"{data.get(_.path)}"]
                 if _.is_single_value
-                else [f"{_v}" for _v in data.get(_.path)]
+                else [f"{_v}" for _v in data.get(_.path)]  # type: ignore[union-attr]
             )
         else:
-            _data = [data.get(_.path)] if _.is_single_value else data.get(_.path)
+            _data: list[dict] = [data.get(_.path)] if _.is_single_value else data.get(_.path)  # type: ignore[assignment,list-item]
             sub_entities_uri = []
             for _v in _data:
                 sub_entity_path = f"{path_from_root}/{_.path}"
diff --git a/tests/conftest.py b/tests/conftest.py
index 89df83c..a1e5b75 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -33,8 +33,16 @@ def _json_dataset() -> Generator[dict, None, None]:
     delete_project(PROJECT_NAME)
 
 
+@dataclass
+class JSONResourceFixtureDate:
+    """fixture dataclass"""
+
+    project_name: str
+    resource_name: str
+
+
 @pytest.fixture(name="json_resource", scope="module")
-def _json_resource() -> object:
+def _json_resource() -> Generator[JSONResourceFixtureDate, None, None]:
     """Set up json resource"""
     _project_name = "resource_test_project"
     _resource_name = "sample_test.json"
@@ -46,13 +54,6 @@ def _json_resource() -> object:
         replace=True,
     )
 
-    @dataclass
-    class FixtureDate:
-        """fixture dataclass"""
-
-        project_name = _project_name
-        resource_name = _resource_name
-
-    _ = FixtureDate()
+    _ = JSONResourceFixtureDate(project_name=_project_name, resource_name=_resource_name)
     yield _
     delete_project(_project_name)
diff --git a/tests/parameter_types/test_code.py b/tests/parameter_types/test_code.py
index e46211c..accc748 100644
--- a/tests/parameter_types/test_code.py
+++ b/tests/parameter_types/test_code.py
@@ -32,14 +32,14 @@ class MyTransformPlugin(TransformPlugin):
 
             def __init__(  # pylint: disable=too-many-arguments  # noqa: PLR0913
                 self,
-                xml: XmlCode = XmlCode("<xml></xml>"), # noqa: B008
-                json: JsonCode = JsonCode("{}"), # noqa: B008
-                jinja: JinjaCode = JinjaCode(""), # noqa: B008
-                sql: SqlCode = SqlCode(""), # noqa: B008
-                yaml: YamlCode = YamlCode(""), # noqa: B008
-                sparql: SparqlCode = SparqlCode(""), # noqa: B008
-                turtle: TurtleCode = TurtleCode(""), # noqa: B008
-                python: PythonCode = PythonCode(""), # noqa: B008
+                xml: XmlCode = XmlCode("<xml></xml>"),  # noqa: B008
+                json: JsonCode = JsonCode("{}"),  # noqa: B008
+                jinja: JinjaCode = JinjaCode(""),  # noqa: B008
+                sql: SqlCode = SqlCode(""),  # noqa: B008
+                yaml: YamlCode = YamlCode(""),  # noqa: B008
+                sparql: SparqlCode = SparqlCode(""),  # noqa: B008
+                turtle: TurtleCode = TurtleCode(""),  # noqa: B008
+                python: PythonCode = PythonCode(""),  # noqa: B008
             ) -> None:
                 self.xml = xml
                 self.json = json
diff --git a/tests/parameter_types/test_resource.py b/tests/parameter_types/test_resource.py
index 277da1a..5f317c6 100644
--- a/tests/parameter_types/test_resource.py
+++ b/tests/parameter_types/test_resource.py
@@ -1,11 +1,12 @@
 """resource parameter type tests"""
 
 from cmem_plugin_base.dataintegration.parameter.resource import ResourceParameterType
+from tests.conftest import JSONResourceFixtureDate
 from tests.utils import TestPluginContext, get_autocomplete_values, needs_cmem
 
 
 @needs_cmem
-def test_resource_parameter_type_completion(json_resource) -> None:
+def test_resource_parameter_type_completion(json_resource: JSONResourceFixtureDate) -> None:
     """Test resource parameter type completion"""
     project_name = json_resource.project_name
     resource_name = json_resource.resource_name
diff --git a/tests/test_output_only_plugin.py b/tests/test_output_only_plugin.py
index db776d8..7ab09c6 100644
--- a/tests/test_output_only_plugin.py
+++ b/tests/test_output_only_plugin.py
@@ -1,4 +1,5 @@
 """test file."""
+
 from collections.abc import Sequence
 
 from cmem_plugin_base.dataintegration.context import ExecutionContext
diff --git a/tests/utils.py b/tests/utils.py
index 3740ea8..c087d1c 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -43,8 +43,9 @@ def __init__(
             self.user = user
 
 
-def get_autocomplete_values(parameter: ParameterType, query_terms: list[str],
-                            context: PluginContext) -> list[str]:
+def get_autocomplete_values(
+    parameter: ParameterType, query_terms: list[str], context: PluginContext
+) -> list[str]:
     """Get autocomplete values"""
     return [
         x.value