Function test_stash

testing/test_stash.py:8–69

()

def test_stash() -> None:
    stash = Stash()

    assert len(stash) == 0
    assert not stash

    key1 = StashKey[str]()
    key2 = StashKey[int]()

    class="cm"># Basic functionality - single key.
    assert key1 not in stash
    stash[key1] = class="st">"hello"
    assert key1 in stash
    assert stash[key1] == class="st">"hello"
    assert stash.get(key1, None) == class="st">"hello"
    stash[key1] = class="st">"world"
    assert stash[key1] == class="st">"world"
    class="cm"># Has correct type (no mypy error).
    stash[key1] + class="st">"string"
    assert len(stash) == 1
    assert stash

    class="cm"># No interaction with another key.
    assert key2 not in stash
    assert stash.get(key2, None) is None
    with pytest.raises(KeyError):
        stash[key2]
    with pytest.raises(KeyError):
        del stash[key2]
    stash[key2] = 1
    assert stash[key2] == 1
    class="cm"># Has correct type (no mypy error).
    stash[key2] + 20
    del stash[key1]
    with pytest.raises(KeyError):
        del stash[key1]
    with pytest.raises(KeyError):
        stash[key1]

    class="cm"># setdefault
    stash[key1] = class="st">"existing"
    assert stash.setdefault(key1, class="st">"default") == class="st">"existing"
    assert stash[key1] == class="st">"existing"
    key_setdefault = StashKey[bytes]()
    assert stash.setdefault(key_setdefault, bclass="st">"default") == bclass="st">"default"
    assert stash[key_setdefault] == bclass="st">"default"
    assert len(stash) == 3
    assert stash

    class="cm"># Can't accidentally add attributes to stash object itself.
    with pytest.raises(AttributeError):
        stash.foo = class="st">"nope"  class="cm"># type: ignore[attr-defined]

    class="cm"># No interaction with another stash.
    stash2 = Stash()
    key3 = StashKey[int]()
    assert key2 not in stash2
    stash2[key2] = 100