Fix tests

Author: phofl

pandas/core/construction.py

@@ -566,7 +566,9 @@ def sanitize_array(
             from pandas.core.arrays.string_ import StringDtype
 
             dtype = StringDtype("pyarrow_numpy")
-            data = dtype.construct_array_type()._from_sequence_of_strings([data])
+            data = dtype.construct_array_type()._from_sequence_of_strings(
+                [data] * len(index)
+            )
         else:
             data = construct_1d_arraylike_from_scalar(data, len(index), dtype)
 

pandas/tests/frame/indexing/test_set_value.py

@@ -16,7 +16,7 @@ def test_set_value(self, float_frame):
                 float_frame._set_value(idx, col, 1)
                 assert float_frame[col][idx] == 1
 
-    def test_set_value_resize(self, float_frame):
+    def test_set_value_resize(self, float_frame, using_infer_string):
         res = float_frame._set_value("foobar", "B", 0)
         assert res is None
         assert float_frame.index[-1] == "foobar"
@@ -27,8 +27,10 @@ def test_set_value_resize(self, float_frame):
 
         res = float_frame.copy()
         res._set_value("foobar", "baz", "sam")
-        assert res["baz"].dtype == np.object_
-
+        if using_infer_string:
+            assert res["baz"].dtype == "string"
+        else:
+            assert res["baz"].dtype == np.object_
         res = float_frame.copy()
         with tm.assert_produces_warning(
             FutureWarning, match="Setting an item of incompatible dtype"