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inline_snapshot

Category = Literal['update', 'fix', 'create', 'trim'] module-attribute

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Snapshot

Can be used to annotate function arguments which accept snapshot values.

You can annotate function arguments with Snapshot[T] to declare that a snapshot-value can be passed as function argument. Snapshot[T] is a type alias for T, which allows you to pass int values instead of int snapshots.

Example:

from typing import Optional
from inline_snapshot import snapshot, Snapshot

# required snapshots


def check_in_bounds(value, lower: Snapshot[int], upper: Snapshot[int]):
    assert lower <= value <= upper


def test_numbers():
    for c in "hello world":
        check_in_bounds(ord(c), snapshot(32), snapshot(119))

    # use with normal values
    check_in_bounds(5, 0, 10)


# optional snapshots


def check_container(
    value,
    *,
    value_repr: Optional[Snapshot[str]] = None,
    length: Optional[Snapshot[int]] = None
):
    if value_repr is not None:
        assert repr(value) == value_repr

    if length is not None:
        assert len(value) == length


def test_container():
    check_container([1, 2], value_repr=snapshot("[1, 2]"), length=snapshot(2))

    check_container({1, 1}, length=snapshot(1))
Source code in src/inline_snapshot/_types.py 
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class Snapshot(Generic[T]):
    """Can be used to annotate function arguments which accept snapshot
    values.

    You can annotate function arguments with `Snapshot[T]` to declare that a snapshot-value can be passed as function argument.
    `Snapshot[T]` is a type alias for `T`, which allows you to pass `int` values instead of `int` snapshots.


    Example:
    <!-- inline-snapshot: create fix trim first_block outcome-passed=2 -->
    ``` python
    from typing import Optional
    from inline_snapshot import snapshot, Snapshot

    # required snapshots


    def check_in_bounds(value, lower: Snapshot[int], upper: Snapshot[int]):
        assert lower <= value <= upper


    def test_numbers():
        for c in "hello world":
            check_in_bounds(ord(c), snapshot(32), snapshot(119))

        # use with normal values
        check_in_bounds(5, 0, 10)


    # optional snapshots


    def check_container(
        value,
        *,
        value_repr: Optional[Snapshot[str]] = None,
        length: Optional[Snapshot[int]] = None
    ):
        if value_repr is not None:
            assert repr(value) == value_repr

        if length is not None:
            assert len(value) == length


    def test_container():
        check_container([1, 2], value_repr=snapshot("[1, 2]"), length=snapshot(2))

        check_container({1, 1}, length=snapshot(1))
    ```
    """