Add typestubs for unittest.util (#3186)

Author: jermenkoo

stdlib/3/unittest/util.pyi

@@ -0,0 +1,22 @@
+# undocumented
+from typing import Any, List, Sequence, Tuple, TypeVar
+
+_T = TypeVar('_T')
+_Mismatch = Tuple[_T, _T, int]
+
+_MAX_LENGTH: int
+_PLACEHOLDER_LEN: int
+_MIN_BEGIN_LEN: int
+_MIN_END_LEN: int
+_MIN_COMMON_LEN: int
+_MIN_DIFF_LEN: int
+
+def _shorten(s: str, prefixlen: int, suffixlen: int) -> str: ...
+def _common_shorten_repr(*args: str) -> Tuple[str]: ...
+def safe_repr(obj: object, short: bool = ...) -> str: ...
+def strclass(cls: type) -> str: ...
+def sorted_list_difference(expected: Sequence[_T], actual: Sequence[_T]) -> Tuple[List[_T], List[_T]]: ...
+def unorderable_list_difference(expected: Sequence[_T], actual: Sequence[_T]) -> Tuple[List[_T], List[_T]]: ...
+def three_way_cmp(x: Any, y: Any) -> int: ...
+def _count_diff_all_purpose(actual: Sequence[_T], expected: Sequence[_T]) -> List[_Mismatch[_T]]: ...
+def _count_diff_hashable(actual: Sequence[_T], expected: Sequence[_T]) -> List[_Mismatch[_T]]: ...