TST: Added test for nested series pandas-dev#22400

Author: KingOfTheShow69

pandas/tests/util/test_assert_series_equal.py

@@ -1,3 +1,4 @@
+import numpy as np
 import pytest
 
 from pandas.core.dtypes.common import is_extension_array_dtype
@@ -400,3 +401,29 @@ def test_unique_agg_type_is_series(test, constant):
     result = df1.agg(aggregation)
 
     tm.assert_series_equal(result, expected)
+
+
+def test_identical_nested_series_is_equal():
+    # GH#22400
+    x = Series(
+        [
+            0,
+            0.0131142231938,
+            1.77774652865e-05,
+            np.array([0.4722720840328748, 0.4216929783681722]),
+        ]
+    )
+    y = Series(
+        [
+            0,
+            0.0131142231938,
+            1.77774652865e-05,
+            np.array([0.4722720840328748, 0.4216929783681722]),
+        ]
+    )
+    # These two arrays should be equal, nesting could cause issue
+
+    tm.assert_series_equal(x, x)
+    tm.assert_series_equal(x, x, check_exact=True)
+    tm.assert_series_equal(x, y)
+    tm.assert_series_equal(x, y, check_exact=True)