diff --git a/src/dynamicprompts/sampling_context.py b/src/dynamicprompts/sampling_context.py
index 6304a0e..a062464 100644
--- a/src/dynamicprompts/sampling_context.py
+++ b/src/dynamicprompts/sampling_context.py
@@ -162,7 +162,7 @@ def process_variable_assignment(
         self,
         command: VariableAssignmentCommand,
     ) -> Command:
-        if command.preserve and command.name in self.variables:            
+        if command.preserve and command.name in self.variables:
             return self.variables[command.name]
         if command.immediate:
             if isinstance(command.value, LiteralCommand):
diff --git a/tests/parser/test_parser.py b/tests/parser/test_parser.py
index e4d6f98..ff684f9 100644
--- a/tests/parser/test_parser.py
+++ b/tests/parser/test_parser.py
@@ -392,12 +392,12 @@ def test_alternative_wildcard_wrap(self, wildcard_wrap: str, template: str):
 
     @pytest.mark.parametrize(
         ("immediate", "preserve"),
-        [ 
+        [
             (False, False),
             (False, True),
             (True, False),
             (True, True),
-        ]
+        ],
     )
     def test_variable_commands(self, immediate: bool, preserve: bool):
         op = "?" if preserve else ""
diff --git a/tests/samplers/test_common.py b/tests/samplers/test_common.py
index 928b42b..cfa215b 100644
--- a/tests/samplers/test_common.py
+++ b/tests/samplers/test_common.py
@@ -759,34 +759,41 @@ def test_immediate_literal_variable(self, random_sampling_context: SamplingConte
         assert str(next(random_sampling_context.generator_from_command(cmd))) == "foo"
 
     @pytest.mark.parametrize(
-            "prompt, possible_results",
-            [
-                (
-                    "${season=summer} ${temp=cold} ${location=north}__drink/beverage__",
-                    ("a glass of iced tea", "a glass of iced pop")
-                ),
-                (
-                    "${season=summer} ${temp=cold} ${location=south}__drink/winter/beverage__",
-                    ("a mug of hot coffee")
-                ),
-                (
-                    "${season=summer} ${temp=cold}__drink/winter/beverage__",
-                    ("a mug of hot tea")
-                ),
-                (
-                    "__drink/summer/beverage__",
-                    ("a glass of iced sweet tea", "a glass of iced soda")
-                ),
-                 (
-                    "${location=north}__drink/summer/beverage__",
-                    ("a glass of iced tea", "a glass of iced pop")
-                )
-            ]
+        "prompt, possible_results",
+        [
+            (
+                "${season=summer} ${temp=cold} ${location=north}__drink/beverage__",
+                ("a glass of iced tea", "a glass of iced pop"),
+            ),
+            (
+                "${season=summer} ${temp=cold} ${location=south}__drink/winter/beverage__",
+                ("a mug of hot coffee"),
+            ),
+            (
+                "${season=summer} ${temp=cold}__drink/winter/beverage__",
+                ("a mug of hot tea"),
+            ),
+            (
+                "__drink/summer/beverage__",
+                ("a glass of iced sweet tea", "a glass of iced soda"),
+            ),
+            (
+                "${location=north}__drink/summer/beverage__",
+                ("a glass of iced tea", "a glass of iced pop"),
+            ),
+        ],
     )
-    def test_preserve_variable(self, random_sampling_context: SamplingContext, prompt: str, possible_results: list[str]):
+    def test_preserve_variable(
+        self,
+        random_sampling_context: SamplingContext,
+        prompt: str,
+        possible_results: list[str],
+    ):
         cmd = parse(prompt)
-        resolved_value = str(next(random_sampling_context.generator_from_command(cmd))).strip()
-        assert resolved_value in possible_results       
+        resolved_value = str(
+            next(random_sampling_context.generator_from_command(cmd)),
+        ).strip()
+        assert resolved_value in possible_results
 
     def test_unknown_variable(self, wildcard_manager: WildcardManager):
         ctx1 = SamplingContext(
diff --git a/tests/test_data/wildcards/drink.yaml b/tests/test_data/wildcards/drink.yaml
index 9c26e68..ef0d32b 100644
--- a/tests/test_data/wildcards/drink.yaml
+++ b/tests/test_data/wildcards/drink.yaml
@@ -5,10 +5,10 @@ drink:
     beverage:
       - '${temp=hot} ${season=winter} ${location?=north} __drink/beverage__'
 
-    north:      
+    north:
       - tea
     south:
-      - coffee      
+      - coffee
 
   summer:
     beverage:
@@ -18,17 +18,16 @@ drink:
       - pop
     south:
       - sweet tea
-      - soda     
+      - soda
 
-  container: 
+  container:
     hot:
       - mug
     cold:
       - glass
 
   temp:
-    hot: 
+    hot:
       - hot
     cold:
       - iced
-        
\ No newline at end of file