msg for doctest unsupported (#25387)

fixes #25380

Author: eleanorjboyd

python_files/tests/unittestadapter/test_utils.py

@@ -284,11 +284,10 @@ def test_build_empty_tree() -> None:
     start_dir = os.fsdecode(TEST_DATA_PATH)
     pattern = "does_not_exist*"
 
-    expected = None
-
     loader = unittest.TestLoader()
     suite = loader.discover(start_dir, pattern)
     tests, errors = build_test_tree(suite, start_dir)
 
-    assert expected == tests
+    assert tests is not None
+    assert tests.get("children") == []
     assert not errors

python_files/unittestadapter/pvsc_utils.py

@@ -3,6 +3,7 @@
 
 import argparse
 import atexit
+import doctest
 import enum
 import inspect
 import json
@@ -202,6 +203,12 @@ def build_test_tree(
     root = build_test_node(top_level_directory, directory_path.name, TestNodeTypeEnum.folder)
 
     for test_case in get_test_case(suite):
+        if isinstance(test_case, doctest.DocTestCase):
+            print(
+                "Skipping doctest as it is not supported for the extension. Test case: ", test_case
+            )
+            error = ["Skipping doctest as it is not supported for the extension."]
+            continue
         test_id = test_case.id()
         if test_id.startswith("unittest.loader._FailedTest"):
             error.append(str(test_case._exception))  # type: ignore  # noqa: SLF001
@@ -255,9 +262,6 @@ def build_test_tree(
             }  # concatenate class name and function test name
             current_node["children"].append(test_node)
 
-    if not root["children"]:
-        root = None
-
     return root, error