add tests for parameter converter

test/python/api/test_api_types.py

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2023 by the Nominatim developer community.
+# For a full list of authors see the git log.
+"""
+Tests for loading of parameter dataclasses.
+"""
+import pytest
+
+from nominatim.errors import UsageError
+import nominatim.api.types as typ
+
+def test_no_params_defaults():
+    params = typ.LookupDetails.from_kwargs({})
+
+    assert not params.parented_places
+    assert params.geometry_simplification == 0.0
+
+
+@pytest.mark.parametrize('k,v', [('geometry_output',  'a'),
+                                 ('linked_places', 0),
+                                 ('geometry_simplification', 'NaN')])
+def test_bad_format_reverse(k, v):
+    with pytest.raises(UsageError):
+        params = typ.ReverseDetails.from_kwargs({k: v})
+
+
+@pytest.mark.parametrize('rin,rout', [(-23, 0), (0, 0), (1, 1),
+                                      (15, 15), (30, 30), (31, 30)])
+def test_rank_params(rin, rout):
+    params = typ.ReverseDetails.from_kwargs({'max_rank': rin})
+
+    assert params.max_rank == rout