TST: add test for getting array from series (pandas-dev#42939)

* TST: add test for getting array from series

* TST: add test for getting array from series

* add skipif for low versions of numpy

* add dtype np.int64

* add test to check that exception is raised for np version < 1.19

* change matched string to '0'

Author: horaceklai

pandas/tests/series/test_constructors.py

@@ -13,6 +13,7 @@
     iNaT,
     lib,
 )
+from pandas.compat.numpy import np_version_under1p19
 import pandas.util._test_decorators as td
 
 from pandas.core.dtypes.common import (
@@ -1840,3 +1841,25 @@ def test_constructor(rand_series_with_duplicate_datetimeindex):
     dups = rand_series_with_duplicate_datetimeindex
     assert isinstance(dups, Series)
     assert isinstance(dups.index, DatetimeIndex)
+
+
+@pytest.mark.parametrize(
+    "input_dict,expected",
+    [
+        ({0: 0}, np.array([[0]], dtype=np.int64)),
+        ({"a": "a"}, np.array([["a"]], dtype=object)),
+        ({1: 1}, np.array([[1]], dtype=np.int64)),
+    ],
+)
+@pytest.mark.skipif(np_version_under1p19, reason="fails on numpy below 1.19")
+def test_numpy_array(input_dict, expected):
+    result = np.array([Series(input_dict)])
+    tm.assert_numpy_array_equal(result, expected)
+
+
+@pytest.mark.skipif(
+    not np_version_under1p19, reason="check failure on numpy below 1.19"
+)
+def test_numpy_array_np_v1p19():
+    with pytest.raises(KeyError, match="0"):
+        np.array([Series({1: 1})])