Fix paramters for ParallelTestSuite and RemoteTestRunner. (#1072)

* Fix paramters for ParallelTestSuite and RemoteTestRunner.

A new parameter `buffer` is added. `suites` is renamed to `subsuites`.

ParallelTestSuite:
https://github.com/django/django/blob/2fac0a18081dcc77fc860c801e5d727dc90435b3/django/test/runner.py#L468-L475

RemoteTestRunner:
https://github.com/django/django/blob/2fac0a18081dcc77fc860c801e5d727dc90435b3/django/test/runner.py#L350

`buffer` was added in django/django@f6713cd,
`suites` was renamed in django/django@cb6c197.
Both of these changes were made in 4.1rc1.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

* Adjust types of attributes for runners.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

Author: PIG208

django-stubs/test/runner.pyi

@@ -65,8 +65,9 @@ class RemoteTestResult:
 
 class RemoteTestRunner:
     resultclass: Any = ...
-    failfast: Any = ...
-    def __init__(self, failfast: bool = ..., resultclass: Optional[Any] = ...) -> None: ...
+    failfast: bool = ...
+    buffer: bool = ...
+    def __init__(self, failfast: bool = ..., resultclass: Optional[Any] = ..., buffer: bool = ...) -> None: ...
     def run(self, test: Any): ...
 
 def default_test_processes() -> int: ...
@@ -75,10 +76,15 @@ class ParallelTestSuite(TestSuite):
     init_worker: Any = ...
     run_subsuite: Any = ...
     runner_class: Any = ...
-    subsuites: Any = ...
-    processes: Any = ...
-    failfast: Any = ...
-    def __init__(self, suite: Any, processes: Any, failfast: bool = ...) -> None: ...
+    subsuites: List[TestSuite] = ...
+    processes: int = ...
+    failfast: bool = ...
+    buffer: bool = ...
+    initial_settings: Any = ...
+    serialized_contents: Any = ...
+    def __init__(
+        self, subsuites: List[TestSuite], processes: int, failfast: bool = ..., buffer: bool = ...
+    ) -> None: ...
     def run(self, result: Any): ...  # type: ignore[override]
 
 class DiscoverRunner: