Update packages/geometry/test/src/geometry_test.dart

Co-authored-by: Allison Ryan <77211884+allisonryan0002@users.noreply.github.com>

packages/geometry/test/src/geometry_test.dart

@@ -158,12 +158,9 @@ void main() {
   });
 
   group('centroid', () {
-    test(
+    test('throws AssertionError when vertices are empty', () {
-      'throws AssertionError when vertices are empty',
+      expect(() => centroid([]), throwsAssertionError);
-      () {
+    });
-        expect(() => centroid([]), throwsAssertionError);
-      },
-    );
 
     test(
       'is correct when one vertex is given',