use TypeError over asserts and fix filter exception tests

graphene_sqlalchemy/filters.py

@@ -79,9 +79,11 @@ def __init_subclass_with_meta__(
         new_filter_fields = {}
         # Generate Graphene Fields from the filter functions based on type hints
         for field_name, _annotations in logic_functions:
-            assert (
-                "val" in _annotations
-            ), "Each filter method must have a value field with valid type annotations"
+            if "val" not in _annotations:
+                raise TypeError(
+                    "Each filter method must have a 'val' field with valid type annotations."
+                )
+
             # If type is generic, replace with actual type of filter class
 
             replace_type_vars = {BaseTypeFilterSelf: cls}
@@ -252,9 +254,11 @@ def __init_subclass_with_meta__(cls, graphene_type=None, _meta=None, **options):
         new_filter_fields = {}
         # Generate Graphene Fields from the filter functions based on type hints
         for field_name, _annotations in filter_functions:
-            assert (
-                "val" in _annotations
-            ), "Each filter method must have a value field with valid type annotations"
+            if "val" not in _annotations:
+                raise TypeError(
+                    "Each filter method must have a 'val' field with valid type annotations."
+                )
+
             # If type is generic, replace with actual type of filter class
             replace_type_vars = {ScalarFilterInputType: _meta.graphene_type}
             field_type = convert_sqlalchemy_type(

graphene_sqlalchemy/tests/test_filters.py

@@ -1214,7 +1214,7 @@ async def test_filter_relationship_no_base_type(session):
 
 
 @pytest.mark.asyncio
-async def test_filter_(session):
+async def test_filter_invalid_filter_method(session):
     with pytest.raises(
         TypeError,
         match=r"(.*)Each filter method must have a 'val' field with valid type annotations.(.*)",