remove use of fixture

Author: williambdean

tests/test_model_graph.py

@@ -536,14 +536,6 @@ def simple_model() -> pm.Model:
     return model
 
 
-@pytest.fixture(scope="module")
-def variable_with_space():
-    with pm.Model() as model:
-        pm.Normal("plant growth")
-
-    return model
-
-
 def test_unknown_node_type(simple_model):
     with pytest.raises(ValueError, match="Node formatters must be of type NodeType."):
         model_to_graphviz(simple_model, node_formatters={"Unknown Node Type": "dummy"})
@@ -662,7 +654,10 @@ def test_model_to_mermaid(simple_model):
     assert model_to_mermaid(simple_model) == expected_mermaid_string.strip()
 
 
-def test_model_to_mermaid_with_variable_with_space(variable_with_space):
+def test_model_to_mermaid_with_variable_with_space():
+    with pm.Model() as variable_with_space:
+        pm.Normal("plant growth")
+
     expected_mermaid_string = dedent("""
     graph TD
     %% Nodes: