tests/test_general.py: test_open(): update to match our new behaviour.

We now always use fz_open_document_with_stream_and_dir(), which gives slightly
different diagnostics on error.

Author: julian-smith-artifex-com

tests/test_general.py

@@ -1444,8 +1444,8 @@ def check(filename=None, stream=None, filetype=None, exception=None):
     etype = pymupdf.FileDataError
     etype2 = 'FzErrorBase' if platform.system() == 'OpenBSD' else 'FzErrorUnsupported'
     etext = (
-            re.escape(f'mupdf.{etype2}: code=6: cannot find document handler for file: {path}'),
-            re.escape(f'pymupdf.FileDataError: Failed to open file {path!r}.'),
+            re.escape(f'mupdf.{etype2}: code=6: cannot find document handler for file type: \'pickle\''),
+            re.escape(f'pymupdf.FileDataError: Failed to open file {path!r} as type pickle.'),
             )
     check(path, exception=(etype, etext))