organise python tests in subdirectories

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

test/python/tools/test_refresh_create_functions.py

@@ -0,0 +1,51 @@
+"""
+Tests for creating PL/pgSQL functions for Nominatim.
+"""
+import pytest
+
+from nominatim.tools.refresh import create_functions
+
+@pytest.fixture
+def sql_tmp_path(tmp_path, def_config):
+    def_config.lib_dir.sql = tmp_path
+    return tmp_path
+
+@pytest.fixture
+def conn(sql_preprocessor, temp_db_conn):
+    return temp_db_conn
+
+
+def test_create_functions(temp_db_cursor, conn, def_config, sql_tmp_path):
+    sqlfile = sql_tmp_path / 'functions.sql'
+    sqlfile.write_text("""CREATE OR REPLACE FUNCTION test() RETURNS INTEGER
+                          AS $$
+                          BEGIN
+                            RETURN 43;
+                          END;
+                          $$ LANGUAGE plpgsql IMMUTABLE;
+                       """)
+
+    create_functions(conn, def_config)
+
+    assert temp_db_cursor.scalar('SELECT test()') == 43
+
+
+@pytest.mark.parametrize("dbg,ret", ((True, 43), (False, 22)))
+def test_create_functions_with_template(temp_db_cursor, conn, def_config, sql_tmp_path,
+                                        dbg, ret):
+    sqlfile = sql_tmp_path / 'functions.sql'
+    sqlfile.write_text("""CREATE OR REPLACE FUNCTION test() RETURNS INTEGER
+                          AS $$
+                          BEGIN
+                            {% if debug %}
+                            RETURN 43;
+                            {% else %}
+                            RETURN 22;
+                            {% endif %}
+                          END;
+                          $$ LANGUAGE plpgsql IMMUTABLE;
+                       """)
+
+    create_functions(conn, def_config, enable_debug=dbg)
+
+    assert temp_db_cursor.scalar('SELECT test()') == ret