Update test_period_range.py

Author: jnecus

pandas/tests/indexes/period/test_period_range.py

@@ -53,6 +53,10 @@ def test_construction_from_period(self):
         tm.assert_index_equal(result, expected)
 
         # test for issue # 21793
+        start, end = Period("2017Q1", freq="Q"), Period("2018Q1", freq="Q")
+        expected = date_range(
+            start="2017-03-31", end="2018-03-31", freq="M", name="foo"
+        ).to_period()
         idx = period_range(start=start, end=end, freq="Q", name="foo")
         result = idx == idx.values
         expected = np.array([True, True, True, True, True])