fixup test_multi;

Author: MarcoGorelli

pandas/tests/reshape/merge/test_multi.py

@@ -123,7 +123,8 @@ def run_asserts(left, right, sort):
 
         lc = list(map(chr, np.arange(ord("a"), ord("z") + 1)))
         left = DataFrame(np.random.choice(lc, (5000, 2)), columns=["1st", "3rd"])
-        left.insert(1, "2nd", np.random.randint(0, 1000, len(left)))
+        # Explicit cast to float to avoid implicit cast when setting nan
+        left.insert(1, "2nd", np.random.randint(0, 1000, len(left)).astype("float"))
 
         i = np.random.permutation(len(left))
         right = left.iloc[i].copy()

pandas/tests/window/test_rolling.py

@@ -432,7 +432,10 @@ def test_closed_uneven():
 )
 def test_closed_min_max_minp(func, closed, expected):
     # see gh-21704
-    ser = Series(data=np.arange(10), index=date_range("2000", periods=10))
+    # Explicit cast to float to avoid implicit cast when setting nan
+    ser = Series(
+        data=np.arange(10), index=date_range("2000", periods=10), dtype="float"
+    )
     ser[ser.index[-3:]] = np.nan
     result = getattr(ser.rolling("3D", min_periods=2, closed=closed), func)()
     expected = Series(expected, index=ser.index)