custom comparison for SpecialPhrase

Duplicate elemination only works when a custom hash/equal function
is implemented that is based on the members.

test/python/tools/test_import_special_phrases.py

@@ -17,11 +17,6 @@ from nominatim.errors import UsageError
 
 from cursor import CursorForTesting
 
-@pytest.fixture
-def testfile_dir(src_dir):
-    return src_dir / 'test' / 'testfiles'
-
-
 @pytest.fixture
 def sp_importer(temp_db_conn, def_config, monkeypatch):
     """

test/python/tools/test_sp_csv_loader.py

@@ -11,6 +11,7 @@ import pytest
 
 from nominatim.errors import UsageError
 from nominatim.tools.special_phrases.sp_csv_loader import SPCsvLoader
+from nominatim.tools.special_phrases.special_phrase import SpecialPhrase
 
 @pytest.fixture
 def sp_csv_loader(src_dir):
@@ -29,17 +30,11 @@ def test_generate_phrases(sp_csv_loader):
     """
     phrases = list(sp_csv_loader.generate_phrases())
 
-    assert len(phrases) == 41
+    assert len(phrases) == 42
     assert len(set(phrases)) == 41
 
-    assert any(p.p_label == 'Billboard'
-               and p.p_class == 'advertising'
-               and p.p_type == 'billboard'
-               and p.p_operator == '-' for p in phrases)
-    assert any(p.p_label == 'Zip Lines'
-               and p.p_class == 'aerialway'
-               and p.p_type == 'zip_line'
-               and p.p_operator == '-' for p in phrases)
+    assert SpecialPhrase('Billboard', 'advertising', 'billboard', '-') in phrases
+    assert SpecialPhrase('Zip Lines', 'aerialway', 'zip_line', '-') in phrases
 
 
 def test_invalid_cvs_file():