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

13-protocol-abc/typing/randompickload_test.py

@@ -0,0 +1,32 @@
+import random
+from typing import Any, Iterable, TYPE_CHECKING
+
+from randompickload import LoadableRandomPicker
+
+class SimplePicker():
+    def __init__(self, items: Iterable) -> None:
+        self._items = list(items)
+        random.shuffle(self._items)
+
+    def pick(self) -> Any:
+        return self._items.pop()
+
+class LoadablePicker():  # <1>
+    def __init__(self, items: Iterable) -> None:
+        self.load(items)
+
+    def pick(self) -> Any:  # <2>
+        return self._items.pop()
+
+    def load(self, items: Iterable) -> Any:  # <3>
+        self._items = list(items)
+        random.shuffle(self._items)
+
+def test_isinstance() -> None:  # <4>
+    popper = LoadablePicker([1])
+    assert isinstance(popper, LoadableRandomPicker)
+
+def test_isinstance_not() -> None:  # <5>
+    popper = SimplePicker([1])
+    assert not isinstance(popper, LoadableRandomPicker)
+