Feature: Replace Whoosh with tantivy search backend (#12471)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Antoine Mérino <3023499+Merinorus@users.noreply.github.com>

src/documents/tests/search/test_schema.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+import pytest
+
+from documents.search._schema import SCHEMA_VERSION
+from documents.search._schema import needs_rebuild
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    from pytest_django.fixtures import SettingsWrapper
+
+pytestmark = pytest.mark.search
+
+
+class TestNeedsRebuild:
+    """needs_rebuild covers all sentinel-file states that require a full reindex."""
+
+    def test_returns_true_when_version_file_missing(self, index_dir: Path) -> None:
+        assert needs_rebuild(index_dir) is True
+
+    def test_returns_false_when_version_and_language_match(
+        self,
+        index_dir: Path,
+        settings: SettingsWrapper,
+    ) -> None:
+        settings.SEARCH_LANGUAGE = "en"
+        (index_dir / ".schema_version").write_text(str(SCHEMA_VERSION))
+        (index_dir / ".schema_language").write_text("en")
+        assert needs_rebuild(index_dir) is False
+
+    def test_returns_true_on_schema_version_mismatch(self, index_dir: Path) -> None:
+        (index_dir / ".schema_version").write_text(str(SCHEMA_VERSION - 1))
+        assert needs_rebuild(index_dir) is True
+
+    def test_returns_true_when_version_file_not_an_integer(
+        self,
+        index_dir: Path,
+    ) -> None:
+        (index_dir / ".schema_version").write_text("not-a-number")
+        assert needs_rebuild(index_dir) is True
+
+    def test_returns_true_when_language_sentinel_missing(
+        self,
+        index_dir: Path,
+        settings: SettingsWrapper,
+    ) -> None:
+        settings.SEARCH_LANGUAGE = "en"
+        (index_dir / ".schema_version").write_text(str(SCHEMA_VERSION))
+        # .schema_language intentionally absent
+        assert needs_rebuild(index_dir) is True
+
+    def test_returns_true_when_language_sentinel_content_differs(
+        self,
+        index_dir: Path,
+        settings: SettingsWrapper,
+    ) -> None:
+        settings.SEARCH_LANGUAGE = "de"
+        (index_dir / ".schema_version").write_text(str(SCHEMA_VERSION))
+        (index_dir / ".schema_language").write_text("en")
+        assert needs_rebuild(index_dir) is True