add sanitizer for TIGER tags

Currently only takes over cleaning the tiger:county data. This was
done by the import until now.

test/python/tokenizer/sanitizers/test_clean_tiger_tags.py

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2022 by the Nominatim developer community.
+# For a full list of authors see the git log.
+"""
+Tests for sanitizer that clean up TIGER tags.
+"""
+import pytest
+
+from nominatim.tokenizer.place_sanitizer import PlaceSanitizer
+from nominatim.data.place_info import PlaceInfo
+
+class TestCleanTigerTags:
+
+    @pytest.fixture(autouse=True)
+    def setup_country(self, def_config):
+        self.config = def_config
+
+
+    def run_sanitizer_on(self, addr):
+        place = PlaceInfo({'address': addr})
+        _, outaddr = PlaceSanitizer([{'step': 'clean-tiger-tags'}], self.config).process_names(place)
+
+        return sorted([(p.name, p.kind, p.suffix) for p in outaddr])
+
+    @pytest.mark.parametrize('inname,outname', [('Hamilton, AL', 'Hamilton'),
+                                                ('Little, Borough, CA', 'Little, Borough')])
+    def test_well_formatted(self, inname, outname):
+        assert self.run_sanitizer_on({'tiger:county': inname})\
+            == [(outname, 'county', 'tiger')]
+
+
+    @pytest.mark.parametrize('name', ('Hamilton', 'Big, Road', ''))
+    def test_badly_formatted(self, name):
+        assert self.run_sanitizer_on({'tiger:county': name})\
+            == [(name, 'county', 'tiger')]
+
+
+    def test_unmatched(self):
+        assert self.run_sanitizer_on({'tiger:country': 'US'})\
+            == [('US', 'tiger', 'country')]