fixup test

Author: jorisvandenbossche

pandas/tests/strings/test_get_dummies.py

@@ -6,6 +6,7 @@
 import pandas.util._test_decorators as td
 
 from pandas import (
+    ArrowDtype,
     DataFrame,
     Index,
     MultiIndex,
@@ -113,15 +114,17 @@ def test_get_dummies_with_str_dtype(any_string_dtype):
 # GH#47872
 @td.skip_if_no("pyarrow")
 def test_get_dummies_with_pa_str_dtype(any_string_dtype):
+    import pyarrow as pa
+
     s = Series(["a|b", "a|c", np.nan], dtype=any_string_dtype)
-    result = s.str.get_dummies("|", dtype="string[pyarrow]")
+    result = s.str.get_dummies("|", dtype=ArrowDtype(pa.string()))
     expected = DataFrame(
         [
             ["true", "true", "false"],
             ["true", "false", "true"],
             ["false", "false", "false"],
         ],
         columns=list("abc"),
-        dtype="string[pyarrow]",
+        dtype=ArrowDtype(pa.string()),
     )
     tm.assert_frame_equal(result, expected)