Fix linting errors in test files

- Add match parameter to pytest.raises for more specific exception testing
- Move imports to top-level of test files
- Add noqa comments for intentionally unused function arguments
- Remove unused variable assignment

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: MImmesberger

tests/interface_dag_elements/test_dates.py

@@ -6,8 +6,10 @@
 
 from ttsim.interface_dag_elements.dates import (
     evaluation_date_from_evaluation_date_str,
+    evaluation_date_str,
     evaluation_date_use_other_info,
     policy_date,
+    policy_date_str,
 )
 from ttsim.interface_dag_elements.interface_node_objects import (
     InputDependentInterfaceFunction,
@@ -52,7 +54,7 @@ def test_policy_date_various_valid_dates(date_str):
 
 
 def test_policy_date_invalid_date_raises():
-    with pytest.raises(ValueError):
+    with pytest.raises(ValueError, match="day is out of range for month"):
         policy_date("2024-02-30")  # Invalid date
 
 
@@ -157,15 +159,11 @@ def test_evaluation_date_from_str_condition_not_satisfied_when_no_eval_date_str(
 # Input definitions tests
 # =============================================================================
 def test_policy_date_str_is_interface_input():
-    from ttsim.interface_dag_elements.dates import policy_date_str
-
     assert isinstance(policy_date_str, InterfaceInput)
     assert policy_date_str.in_top_level_namespace is True
 
 
 def test_evaluation_date_str_is_interface_input():
-    from ttsim.interface_dag_elements.dates import evaluation_date_str
-
     assert isinstance(evaluation_date_str, InterfaceInput)
     assert evaluation_date_str.in_top_level_namespace is True
 

tests/interface_dag_elements/test_interface_node_objects.py

@@ -127,7 +127,7 @@ def my_func(x: int) -> int:
 
 def test_interface_function_dependencies_property():
     @interface_function()
-    def my_func(a: int, b: str, c: float) -> int:
+    def my_func(a: int, b: str, c: float) -> int:  # noqa: ARG001
         return a
 
     assert my_func.dependencies == {"a", "b", "c"}
@@ -143,7 +143,7 @@ def original_name(x: int) -> int:
 
 def test_interface_function_preserves_signature():
     @interface_function()
-    def my_func(a: int, b: str = "default") -> int:
+    def my_func(a: int, b: str = "default") -> int:  # noqa: ARG001
         return a
 
     sig = inspect.signature(my_func)

tests/interface_dag_elements/test_labels.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import networkx as nx
+import numpy as np
 import pytest
 
 from ttsim.interface_dag_elements.labels import (
@@ -128,8 +129,6 @@ def test_input_columns_from_input_data_empty():
 # input_columns_is_empty_set tests
 # =============================================================================
 def test_input_columns_is_empty_set_returns_empty():
-    import numpy as np
-
     result = input_columns_is_empty_set(xnp=np)
     assert result == set()
 

tests/interface_dag_elements/test_raw_results.py

@@ -48,7 +48,7 @@ def tt_function(data):
         call_args.append(data)
         return {"output": xnp.array([1, 2])}
 
-    result = columns(
+    columns(
         labels__root_nodes=root_nodes,
         processed_data=processed_data,
         tt_function=tt_function,