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        "author": "Michael Clawar, Eric Linden",
        "author_email": "tech@stratodem.com",
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        "description": "\n# dash-snapshot-testing\nUse snapshot testing, inspired by Jest snapshot testing, to test [Dash][] components.\n\nSee the project [README](https://github.com/StratoDem/dash-snapshot-testing/blob/master/README.md) for more detailed information.\n\n## Inspiration\nTesting a long HTML component output for a Dash application is difficult.\nIt typically requires hardcoding data or setting up a dummy database.\nUsing snapshot tests that JSON serialize the Dash component output provide another\neasy testing layer to ensure that code refactors/changes do not change the\noutput unexpectedly.\n\nTo learn more about snapshot testing in general, see a much more elaborate explanation from the [Facebook Jest site](https://facebook.github.io/jest/docs/en/snapshot-testing.html)\n\n## Installation and usage\n```bash\n$ pip install dash-snapshot-testing\n```\n\n```python\nimport dash_html_components as html\n\nfrom dash_snapshot_testing.snapshot_test import DashSnapshotTestCase\n\n\nclass MyUnitTestCase(DashSnapshotTestCase):\n    def test_component(self):\n        my_component = html.Div([html.P('wow'), html.Span('this works')], id='test-id')\n\n        self.assertSnapshotEqual(my_component, 'my-test-unique-id')\n```\n\nThis outputs/checks this JSON at `__snapshots__/MyUnitTestCase-my-test-unique-id.json`:\n```json\n{\n  \"type\": \"Div\",\n  \"props\": {\n    \"id\": \"test-id\",\n    \"children\": [\n      {\n        \"type\": \"P\",\n        \"props\": {\"children\": \"wow\"},\n        \"namespace\": \"dash_html_components\"\n      },\n      {\n        \"type\": \"Span\",\n        \"props\": {\"children\": \"this works\"},\n        \"namespace\": \"dash_html_components\"\n      }\n    ]\n  },\n  \"namespace\": \"dash_html_components\"\n}\n```\n\n### Setting a custom `snapshots_dir` for the class\n```python\nclass MyOtherUnitTestCase(DashSnapshotTestCase):\n    snapshots_dir = '__snapshots_2__'\n\n    def test_component(self):\n        my_component = html.Div([html.P('wow'), html.Span('another one')], id='test-id')\n\n        self.assertSnapshotEqual(my_component, 'my-test-unique-id')\n```\n\nThis outputs/checks this JSON at `__snapshots_2__/MyOtherUnitTestCase-my-test-unique-id.json`:\n```json\n{\n  \"type\": \"Div\",\n  \"props\": {\n    \"id\": \"test-id\",\n    \"children\": [\n      {\n        \"type\": \"P\",\n        \"props\": {\"children\": \"wow\"},\n        \"namespace\": \"dash_html_components\"\n      },\n      {\n        \"type\": \"Span\",\n        \"props\": {\"children\": \"another one\"},\n        \"namespace\": \"dash_html_components\"\n      }\n    ]\n  },\n  \"namespace\": \"dash_html_components\"\n}\n```\n\n### Overwriting snapshots\nTo overwrite pre-existing snapshots, [like in Jest](https://facebook.github.io/jest/docs/en/snapshot-testing.html#updating-snapshots), set an environment variable as `UPDATE_DASH_SNAPSHOTS=TRUE`:\n```bash\n# This will run and make new snapshots\n> UPDATE_DASH_SNAPSHOTS=TRUE python -m unittest my_test_module\n# This will run against the previous snapshots\n> python -m unittest my_test_module\n```\n\n### How this works\nAt its core, this `unittest.TestCase` compares a JSON-serialized Dash component\nagainst a previously stored JSON-serialized Dash component, and checks if the `dict`\nobjects from `json.loads` are equivalent using `assertEqual`.\n\n[Dash]: https://github.com/plotly/dash    \n\n\n",
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