run cpyext tests with opaque FS

Author: timfel

mx.graalpython/mx_graalpython.py

@@ -348,6 +348,10 @@ def gate_unittests(args=[], subdir=""):
         # TODO: re-enable when python3 is available on darwin
         mx.log("Running tests with CPython")
         mx.run(["python3"] + test_args, nonZeroIsFatal=True)
+    if platform.system() != 'Darwin' and not pre_args and not post_args and not subdir:
+        mx.log("Running cpyext tests with opaque FS")
+        test_args = [_graalpytest_driver, "-v", _test_project + "src/tests/cpyext/"]
+        mx.command_function("python")(["--python.CatchAllExceptions=true", "--python.OpaqueFilesystem"] + pre_args + test_args + post_args)
 
 
 def run_python_unittests(python_binary, args=[], aot_compatible=True, exclude=[]):