organise python tests in subdirectories

The directories follow the same structure as the modules in
nominatim/.

test/python/tools/test_freeze.py

@@ -0,0 +1,49 @@
+"""
+Tests for freeze functions (removing unused database parts).
+"""
+from nominatim.tools import freeze
+
+NOMINATIM_RUNTIME_TABLES = [
+    'country_name', 'country_osm_grid',
+    'location_postcode', 'location_property_osmline', 'location_property_tiger',
+    'placex', 'place_adressline',
+    'search_name',
+    'word'
+]
+
+NOMINATIM_DROP_TABLES = [
+    'address_levels',
+    'location_area', 'location_area_country', 'location_area_large_100',
+    'location_road_1',
+    'place', 'planet_osm_nodes', 'planet_osm_rels', 'planet_osm_ways',
+    'search_name_111',
+    'wikipedia_article', 'wikipedia_redirect'
+]
+
+def test_drop_tables(temp_db_conn, temp_db_cursor, table_factory):
+    for table in NOMINATIM_RUNTIME_TABLES + NOMINATIM_DROP_TABLES:
+        table_factory(table)
+
+    freeze.drop_update_tables(temp_db_conn)
+
+    for table in NOMINATIM_RUNTIME_TABLES:
+        assert temp_db_cursor.table_exists(table)
+
+    for table in NOMINATIM_DROP_TABLES:
+        assert not temp_db_cursor.table_exists(table)
+
+def test_drop_flatnode_file_no_file():
+    freeze.drop_flatnode_file('')
+
+
+def test_drop_flatnode_file_file_already_gone(tmp_path):
+    freeze.drop_flatnode_file(str(tmp_path / 'something.store'))
+
+
+def test_drop_flatnode_file_delte(tmp_path):
+    flatfile = tmp_path / 'flatnode.store'
+    flatfile.write_text('Some content')
+
+    freeze.drop_flatnode_file(str(flatfile))
+
+    assert not flatfile.exists()