ch11-24: clean up by @eumiro & sync with Atlas

13-protocol-abc/typing/randompick_test.py

@@ -0,0 +1,25 @@
+import random
+from typing import Any, Iterable, TYPE_CHECKING
+
+from randompick import RandomPicker  # <1>
+
+class SimplePicker():  # <2>
+    def __init__(self, items: Iterable) -> None:
+        self._items = list(items)
+        random.shuffle(self._items)
+
+    def pick(self) -> Any:  # <3>
+        return self._items.pop()
+
+def test_isinstance() -> None:  # <4>
+    popper = SimplePicker([1])
+    assert isinstance(popper, RandomPicker)
+
+def test_item_type() -> None:  # <5>
+    items = [1, 2]
+    popper = SimplePicker(items)
+    item = popper.pick()
+    assert item in items
+    if TYPE_CHECKING:
+        reveal_type(item)  # <6>
+    assert isinstance(item, int)