---
prelude: >
  The `testing.DocumentStoreBaseTests` has been heavily overhauled.
  It has been split into multiple classes so developers can gradually test their Document Store as they're implemented.
  `DocumentStoreBaseTests` now inherits from this classes:
  - `CountDocumentsTest`, to test `DocumentStore.count_documents()`
  - `WriteDocumentsTest`, to test `DocumentStore.write_documents()`
  - `DeleteDocumentsTest`, to test `DocumentStore.delete_documents()`
  - `FilterDocumentsTest`, to test `DocumentStore.filter_documents()`

  To use each class it's enough to inherit from it and define the `document_store` fixture to return an instance of the Document Store we're implementing.
  ```python
  class MyDocumentStoreCountDocumentTest(CountDocumentsTest):
      @pytest.fixture
      def document_store(self):
          return MyDocumentStore()
  ```

  There's also another class that tests `DocumentStore.filter_documents()` using legacy filters.
  This is not inherited by `DocumentStoreBaseTests` but can be added as a base class to verify the support of legacy filters.
  - `LegacyFilterDocumentsTest`

preview:
  - |
    Rework the `testing.DocumentStoreBaseTests` class to ease Document Stores development and testing