stdlib: Add many missing dunder overrides (#7231)

stdlib/unittest/case.pyi

@@ -82,6 +82,7 @@ class TestCase:
     # undocumented
     _testMethodDoc: str
     def __init__(self, methodName: str = ...) -> None: ...
+    def __eq__(self, other: object) -> bool: ...
     def setUp(self) -> None: ...
     def tearDown(self) -> None: ...
     @classmethod

stdlib/unittest/mock.pyi

@@ -128,6 +128,8 @@ class NonCallableMock(Base, Any):
         **kwargs: Any,
     ) -> None: ...
     def __getattr__(self, name: str) -> Any: ...
+    def __delattr__(self, name: str) -> None: ...
+    def __setattr__(self, name: str, value: Any) -> None: ...
     if sys.version_info >= (3, 8):
         def _calls_repr(self, prefix: str = ...) -> str: ...
         def assert_called_with(self, *args: Any, **kwargs: Any) -> None: ...

stdlib/unittest/suite.pyi

@@ -15,6 +15,7 @@ class BaseTestSuite(Iterable[_TestType]):
     def debug(self) -> None: ...
     def countTestCases(self) -> int: ...
     def __iter__(self) -> Iterator[_TestType]: ...
+    def __eq__(self, other: object) -> bool: ...
 
 class TestSuite(BaseTestSuite):
     def run(self, result: unittest.result.TestResult, debug: bool = ...) -> unittest.result.TestResult: ...