skip test if pyarrow cannot be imported.

Author: wooseogchoi

pandas/tests/io/parser/test_unsupported.py

@@ -152,6 +152,7 @@ def test_pyarrow_engine(self):
                 read_csv(StringIO(data), engine="pyarrow", **kwargs)
 
     def test_pyarrow_newlines_in_values(self):
+        pytest.importorskip("pyarrow")
         msg = (
             "CSV parser got out of sync with chunker. "
             "This can mean the data file contains cell values spanning multiple "