Update python/pyarrow/tests/test_scalars.py

Co-authored-by: Antoine Pitrou <pitrou@free.fr>

Author: thisisnic

python/pyarrow/tests/test_scalars.py

@@ -258,6 +258,7 @@ def test_numerics():
     assert repr(s) == "<pyarrow.HalfFloatScalar: 0.5>"
     assert str(s) == "0.5"
     assert s.as_py() == 0.5
+    assert float(s) == 1.5
     assert int(s) == 0