core/structure: help locate/extract gdpr exports

tests/core/structure_data/gdpr_subdirs/gdpr_export/messages/index.csv

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+test message

tests/core/test_structure.py

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+from my.core.structure import match_structure
+
+from pathlib import Path
+
+structure_data: Path = Path(__file__).parent / "structure_data"
+
+gdpr_expected = ("comments", "messages/index.csv", "profile")
+
+
+def test_gdpr_structure_exists() -> None:
+    with match_structure(structure_data, expected=gdpr_expected) as results:
+        assert results == (structure_data / "gdpr_subdirs" / "gdpr_export",)
+
+
+def test_gdpr_unzip() -> None:
+
+    with match_structure(
+        structure_data / "gdpr_export.zip", expected=gdpr_expected
+    ) as results:
+        assert len(results) == 1
+        extracted = results[0]
+        index_file = extracted / "messages" / "index.csv"
+        assert index_file.read_text().strip() == "test message"
+
+    # make sure the temporary directory this created no longer exists
+    assert not extracted.exists()
+