fix: add test for missing className

Author: maxencehenneron

src/__tests__/native/className-with-style.test.tsx

@@ -179,6 +179,21 @@ describe("style={undefined} should not destroy computed className styles", () =>
     });
   });
 
+  test("FlatList: className should map to style", () => {
+    registerCSS(`.bg-red { background-color: red; }`);
+
+    const component = render(
+      <FlatList
+        testID={testID}
+        data={[]}
+        renderItem={() => null}
+        className="bg-red"
+      />,
+    ).getByTestId(testID);
+
+    expect(component.props.style).toStrictEqual({ backgroundColor: "#f00" });
+  });
+
   // Path B: FlatList with columnWrapperClassName (another non-"style" array target)
   test("FlatList: contentContainerClassName with contentContainerStyle={undefined}", () => {
     registerCSS(`.p-4 { padding: 16px; }`);