fix unit tests

Summary:
there was a unit test failing, that blocks contbuild for RI https://www.internalfb.com/intern/test/562950028975323?ref_report_id=0

https://www.internalfb.com/sandcastle/workflow/117093590327028273

I debugged the problem to the `os.path.exists(testHostPath)` check which returns `False`, because files provided in the config have never been created in the test run. This diff creates these files to satisfy the check

Differential Revision: D58088315

fbshipit-source-id: bbaf1a555fd008668998c590189ec271e0bce907

idb/grpc/tests/xctest_tests.py

@@ -18,6 +18,10 @@ class XCTestsTestCase(IsolatedAsyncioTestCase):
     async def test_extract_paths_from_xctestrun(self) -> None:
         with tempfile.TemporaryDirectory() as tmp_dir:
             file_path = os.path.join(tmp_dir, "test.plist")
+            with open(os.path.join(tmp_dir, "rest1"), "w") as rest1:
+                rest1.write("rest1")
+            with open(os.path.join(tmp_dir, "rest2"), "w") as rest2:
+                rest2.write("rest2")
             with open(file_path, "wb+") as f:
                 plistlib.dump(
                     {