normalize get_data paths

Author: mr-c

tests/util.py

@@ -3,6 +3,7 @@
 import distutils.spawn  # pylint: disable=no-name-in-module,import-error
 import functools
 import os
+from typing import Text
 
 import pytest
 from pkg_resources import (Requirement, ResolutionError,  # type: ignore
@@ -11,6 +12,7 @@
 from cwltool.factory import Factory
 from cwltool.utils import onWindows, windows_default_container_id
 from cwltool.context import RuntimeContext, LoadingContext
+from cwltool.resolver import Path
 
 def get_windows_safe_factory(runtime_context=None,  # type: RuntimeContext
                              loading_context=None,  # type: LoadingContext
@@ -39,10 +41,7 @@ def get_data(filename):
         pass
     if not filepath or not os.path.isfile(filepath):
         filepath = os.path.join(os.path.dirname(__file__), os.pardir, filename)
-        # warning, __file__ is all lowercase on Windows systems, this can
-        # sometimes conflict with docker toolkit. Workaround: pip install .
-        # and run the tests elsewhere via python -m pytest --pyarg cwltool
-    return filepath
+    return Text(Path(filepath).resolve())
 
 
 needs_docker = pytest.mark.skipif(not bool(distutils.spawn.find_executable('docker')),