feat(testing): expose pytest marks as tags in Test Explorer

Extract pytest marks (e.g., @pytest.mark.slow, @pytest.mark.integration)
during test discovery and expose them as VS Code TestTags with IDs like
"mark.slow", "mark.integration". This enables filtering tests by
marks in the Test Explorer UI using @python-tests:mark.slow syntax.

Changes:
- Add tags field to TestItem TypedDict in pytest plugin
- Extract marks from test_case.own_markers in create_test_node()
- Add tags field to DiscoveredTestItem TypeScript type
- Create TestTag objects from marks in populateTestTree()

Fixes #20350

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: andravin

python_files/vscode_pytest/__init__.py

@@ -56,6 +56,7 @@ class TestItem(TestData):
 
     lineno: str
     runID: str
+    tags: list[str]
 
 
 class TestNode(TestData):
@@ -835,13 +836,22 @@ def create_test_node(
         str(test_case.location[1] + 1) if (test_case.location[1] is not None) else ""
     )
     absolute_test_id = get_absolute_test_id(test_case.nodeid, get_node_path(test_case))
+
+    # Extract pytest marks as tags
+    tags: list[str] = []
+    if hasattr(test_case, "own_markers"):
+        for marker in test_case.own_markers:
+            if marker.name and marker.name != "parametrize":
+                tags.append(marker.name)
+
     return {
         "name": test_case.name,
         "path": get_node_path(test_case),
         "lineno": test_case_loc,
         "type_": "test",
         "id_": absolute_test_id,
         "runID": absolute_test_id,
+        "tags": tags,
     }
 
 

src/client/testing/testController/common/types.ts

@@ -201,6 +201,7 @@ export type DiscoveredTestCommon = {
 export type DiscoveredTestItem = DiscoveredTestCommon & {
     lineno: number | string;
     runID: string;
+    tags?: string[];
 };
 
 export type DiscoveredTestNode = DiscoveredTestCommon & {

src/client/testing/testController/common/utils.ts

@@ -253,7 +253,10 @@ export function populateTestTree(
                 // Create project-scoped vsId
                 const vsId = projectId ? `${projectId}${PROJECT_ID_SEPARATOR}${child.id_}` : child.id_;
                 const testItem = testController.createTestItem(vsId, child.name, Uri.file(child.path));
-                testItem.tags = [RunTestTag, DebugTestTag];
+
+                // Create tags from pytest marks (if available) and combine with default tags
+                const pytestMarkTags = (child.tags ?? []).map((tag) => ({ id: `mark.${tag}` }));
+                testItem.tags = [RunTestTag, DebugTestTag, ...pytestMarkTags];
 
                 let range: Range | undefined;
                 if (child.lineno) {
@@ -268,7 +271,6 @@ export function populateTestTree(
                 }
                 testItem.canResolveChildren = false;
                 testItem.range = range;
-                testItem.tags = [RunTestTag, DebugTestTag];
 
                 testRoot!.children.add(testItem);
                 // add to our map - use runID as key, vsId as value