Improve types for DiscoverRunner (#1106)

* Improve types for DiscoverRunner

* add types for class-level attrs

* Add extra methods

* Add PDBDebugResult class

* black

* Update django-stubs/test/runner.pyi

* fix load_with_patterns return

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

django-stubs/test/runner.pyi

@@ -1,12 +1,15 @@
 import logging
 from argparse import ArgumentParser
+from contextlib import contextmanager
 from io import StringIO
-from typing import Any, Dict, List, Optional, Sequence, Set, Tuple, Type
-from unittest import TestCase, TestSuite, TextTestResult
+from typing import Any, Dict, Iterator, List, Optional, Sequence, Set, Tuple, Type, Union
+from unittest import TestCase, TestLoader, TestSuite, TextTestResult, TextTestRunner
 
 from django.db.backends.base.base import BaseDatabaseWrapper
 from django.test.testcases import SimpleTestCase, TestCase
+from django.test.utils import TimeKeeperProtocol
 from django.utils.datastructures import OrderedSet
+from typing_extensions import Literal
 
 class DebugSQLTextTestResult(TextTestResult):
     buffer: bool
@@ -33,6 +36,8 @@ class DebugSQLTextTestResult(TextTestResult):
     def addError(self, test: Any, err: Any) -> None: ...
     def addFailure(self, test: Any, err: Any) -> None: ...
 
+class PDBDebugResult(TextTestResult): ...
+
 class RemoteTestResult:
     events: List[Any] = ...
     failfast: bool = ...
@@ -77,11 +82,11 @@ class ParallelTestSuite(TestSuite):
     def run(self, result: Any): ...  # type: ignore[override]
 
 class DiscoverRunner:
-    test_suite: Any = ...
-    parallel_test_suite: Any = ...
-    test_runner: Any = ...
-    test_loader: Any = ...
-    reorder_by: Any = ...
+    test_suite: Type[TestSuite] = ...
+    parallel_test_suite: Type[ParallelTestSuite] = ...
+    test_runner: Type[TextTestRunner] = ...
+    test_loader: TestLoader = ...
+    reorder_by: Tuple[SimpleTestCase, ...] = ...
     pattern: Optional[str] = ...
     top_level: Optional[str] = ...
     verbosity: int = ...
@@ -94,6 +99,12 @@ class DiscoverRunner:
     parallel: int = ...
     tags: Set[str] = ...
     exclude_tags: Set[str] = ...
+    pdb: bool = ...
+    buffer: bool = ...
+    test_name_patterns: Optional[Set[str]] = ...
+    time_keeper: TimeKeeperProtocol = ...
+    shuffle: Union[int, Literal[False]] = ...
+    logger: Optional[logging.Logger] = ...
     def __init__(
         self,
         pattern: Optional[str] = ...,
@@ -113,22 +124,32 @@ class DiscoverRunner:
         buffer: bool = ...,
         enable_faulthandler: bool = ...,
         timing: bool = ...,
+        shuffle: Union[int, Literal[False]] = ...,
+        logger: Optional[logging.Logger] = ...,
         **kwargs: Any
     ) -> None: ...
     @classmethod
     def add_arguments(cls, parser: ArgumentParser) -> None: ...
+    @property
+    def shuffle_seed(self) -> Optional[int]: ...
+    def log(self, msg: str, level: Optional[int]) -> None: ...
     def setup_test_environment(self, **kwargs: Any) -> None: ...
+    def setup_shuffler(self) -> None: ...
+    @contextmanager
+    def load_with_patterns(self) -> Iterator[None]: ...
+    def load_tests_for_label(self, label: str, discover_kwargs: Dict[str, str]) -> TestSuite: ...
     def build_suite(
         self, test_labels: Sequence[str] = ..., extra_tests: Optional[List[Any]] = ..., **kwargs: Any
     ) -> TestSuite: ...
     def setup_databases(self, **kwargs: Any) -> List[Tuple[BaseDatabaseWrapper, str, bool]]: ...
     def get_resultclass(self) -> Optional[Type[TextTestResult]]: ...
-    def get_test_runner_kwargs(self) -> Dict[str, Optional[int]]: ...
+    def get_test_runner_kwargs(self) -> Dict[str, Any]: ...
     def run_checks(self, databases: Set[str]) -> None: ...
     def run_suite(self, suite: TestSuite, **kwargs: Any) -> TextTestResult: ...
     def teardown_databases(self, old_config: List[Tuple[BaseDatabaseWrapper, str, bool]], **kwargs: Any) -> None: ...
     def teardown_test_environment(self, **kwargs: Any) -> None: ...
     def suite_result(self, suite: TestSuite, result: TextTestResult, **kwargs: Any) -> int: ...
+    def _get_databases(self, suite: TestSuite) -> Set[str]: ...
     def get_databases(self, suite: TestSuite) -> Set[str]: ...
     def run_tests(self, test_labels: List[str], extra_tests: Optional[List[Any]] = ..., **kwargs: Any) -> int: ...