test: sort results in aggregate_string_and_expression_equivalent for consistency

Author: kosiew

python/tests/test_dataframe.py

@@ -292,8 +292,8 @@ def test_sort_unsupported(df):
 
 
 def test_aggregate_string_and_expression_equivalent(df):
-    result_str = df.aggregate("a", [f.count()]).to_pydict()
-    result_expr = df.aggregate(col("a"), [f.count()]).to_pydict()
+    result_str = df.aggregate("a", [f.count()]).sort("a").to_pydict()
+    result_expr = df.aggregate(col("a"), [f.count()]).sort("a").to_pydict()
     assert result_str == result_expr