Metadata-Version: 2.1
Name: syrupy
Version: 0.0.2
Summary: PyTest Snapshot Test Utility
Home-page: https://github.com/tophat/syrupy
Author: Top Hat Open Source
Author-email: opensource@tophat.com
License: UNKNOWN
Platform: UNKNOWN
Classifier: Development Status :: 1 - Planning
Classifier: Framework :: Pytest
Classifier: Intended Audience :: Developers
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 3
Classifier: Topic :: Software Development :: Libraries
Requires-Python: ~=3.6
Description-Content-Type: text/markdown
Requires-Dist: pyyaml

# syrupy

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> _/ˈsirəpē/_

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## Overview

Syrupy is a pytest snapshot plugin. It enables developers to write tests which assert immutability of computed results.

## Motivation

The most popular snapshot test plugin compatible with pytest has some core limitations which this package attempts to address by upholding some keys values:

- Extensible: If a particular data type is not supported, users should be able to easily and quickly add support.
- Idiomatic: Snapshot testing should fit naturally among other tests cases in pytest, e.g. `assert x == snapshot` vs. `snapshot.assert_match(x)`.
- Soundness: Snapshot tests should uncover even the most minute issues. Unlike other snapshot libraries, Syrupy will fail a test suite if a snapshot does not exist, not just on snapshot differences.

## Installation

```shell
python -m pip install syrupy
```

## Usage

### Basic Usage

In a pytest test file `test_file.py`:

```python
def test_foo(snapshot):
    actual = "Some computed value!"
    assert actual == snapshot
```

when you run `pytest`, the above test should fail due to a missing snapshot. Re-run pytest with the update snapshots flag like so:

```shell
pytest --update-snapshots
```

A snapshot file should be generated under a `__snapshots__` directory in the same directory as `test_file.py`. The `__snapshots__` directory and all its children should be committed along with your test code.

### Advanced Usage, Plugin Support

```python
import pytest

@pytest.fixture
def snapshot_custom(snapshot):
    return snapshot.with_class(
        io_class=CustomIOClass,
        serializer_class=CustomSerializerClass,
    )

def test_image(snapshot_custom):
    actual = "..."
    assert actual == snapshot_custom
```

Both `CustomIOClass` and `CustomSerializerClass` should extend `syrupy.io.SnapshotIO` and `syrupy.io.SnapshotSerializer` respectively.

## Uninstalling

```python
pip uninstall syrupy
```

## Contributing

Feel free to open a PR. This project is still in a very early stage, and we're still figuring out what direction we want to move towards.

To develop locally, clone this repository and run `. script/bootstrap` to install test dependencies. You can then use `invoke --list` to see available commands.

## Contributors

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    <td align="center"><a href="https://noahnu.com"><img src="https://avatars0.githubusercontent.com/u/1297096?v=4" width="100px;" alt="Noah"/><br /><sub><b>Noah</b></sub></a><br /><a href="#infra-noahnu" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="#ideas-noahnu" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/tophat/syrupy/commits?author=noahnu" title="Code">💻</a> <a href="https://github.com/tophat/syrupy/commits?author=noahnu" title="Documentation">📖</a></td>
    <td align="center"><a href="http://emmanuel.ogbizi.com"><img src="https://avatars0.githubusercontent.com/u/2528959?v=4" width="100px;" alt="Emmanuel Ogbizi"/><br /><sub><b>Emmanuel Ogbizi</b></sub></a><br /><a href="https://github.com/tophat/syrupy/commits?author=iamogbz" title="Code">💻</a> <a href="#design-iamogbz" title="Design">🎨</a> <a href="#infra-iamogbz" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/tophat/syrupy/commits?author=iamogbz" title="Documentation">📖</a></td>
  </tr>
</table>

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