[fix] unit tests: call searx.search.initialize in test's setUp

Depending on the order the unit tests are executed, the searx.search module is
initalized or not, issue reported in [1]::

    Traceback (most recent call last):
      File "searxng/tests/unit/test_results.py", line 72, in test_result_merge_by_title
        self.container.extend('stract', [fake_result(engine='stract', title='short title')])
      File "searxng/searx/results.py", line 243, in extend
        histogram_observe(standard_result_count, 'engine', engine_name, 'result', 'count')
      File "searxng/searx/metrics/__init__.py", line 49, in histogram_observe
        histogram_storage.get(*args).observe(duration)
        ^^^^^^^^^^^^^^^^^^^^^
      AttributeError: 'NoneType' object has no attribute 'get'

To ensure that the searx.search module is initialized, the

- searx.engines.load_engines is replace by
- searx.search.initialize

[1] https://github.com/searxng/searxng/pull/3932#discussion_r1822406569

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

5 files changed, 35 insertions, 45 deletions

diff --git a/tests/unit/processors/test_online.py b/tests/unit/processors/test_online.py
index 10e0deb97..fcb01587d 100644
--- a/tests/unit/processors/test_online.py
+++ b/tests/unit/processors/test_online.py
@@ -3,7 +3,7 @@
 
 from searx.search import SearchQuery, EngineRef
 from searx.search.processors import online
-from searx.engines import load_engines
+import searx.search
 from searx import engines
 
 from tests import SearxTestCase
@@ -22,10 +22,10 @@ TEST_ENGINE = {
 class TestOnlineProcessor(SearxTestCase):  # pylint: disable=missing-class-docstring
 
     def setUp(self):
-        load_engines([TEST_ENGINE])
+        searx.search.initialize([TEST_ENGINE])
 
     def tearDown(self):
-        load_engines([])
+        searx.search.load_engines([])
 
     def _get_params(self, online_processor, search_query, engine_category):
         params = online_processor.get_params(search_query, engine_category)
diff --git a/tests/unit/test_engine_mariadb_server.py b/tests/unit/test_engine_mariadb_server.py
index 423132e34..c4144a601 100644
--- a/tests/unit/test_engine_mariadb_server.py
+++ b/tests/unit/test_engine_mariadb_server.py
@@ -2,26 +2,11 @@
 # pylint: disable=missing-module-docstring
 
 from unittest.mock import MagicMock, Mock
-from searx.engines import load_engines, mariadb_server
+from searx.engines import mariadb_server
 from tests import SearxTestCase
 
 
 class MariadbServerTests(SearxTestCase):  # pylint: disable=missing-class-docstring
-    def setUp(self):
-        load_engines(
-            [
-                {
-                    'name': 'mariadb server',
-                    'engine': 'mariadb_server',
-                    'shortcut': 'mdb',
-                    'timeout': 9.0,
-                    'disabled': True,
-                }
-            ]
-        )
-
-    def tearDown(self):
-        load_engines([])
 
     def test_init_no_query_str_raises(self):
         self.assertRaises(ValueError, lambda: mariadb_server.init({}))
diff --git a/tests/unit/test_engine_tineye.py b/tests/unit/test_engine_tineye.py
index 5855a7313..7dc8233d4 100644
--- a/tests/unit/test_engine_tineye.py
+++ b/tests/unit/test_engine_tineye.py
@@ -1,28 +1,34 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # pylint: disable=missing-module-docstring
 
-
+import logging
 from datetime import datetime
 from unittest.mock import Mock
 from requests import HTTPError
 from parameterized import parameterized
-from searx.engines import load_engines, tineye
+import searx.search
+import searx.engines
 from tests import SearxTestCase
 
 
 class TinEyeTests(SearxTestCase):  # pylint: disable=missing-class-docstring
 
     def setUp(self):
-        load_engines([{'name': 'tineye', 'engine': 'tineye', 'shortcut': 'tin', 'timeout': 9.0, 'disabled': True}])
+        searx.search.initialize(
+            [{'name': 'tineye', 'engine': 'tineye', 'shortcut': 'tin', 'timeout': 9.0, 'disabled': True}]
+        )
+
+        self.tineye = searx.engines.engines['tineye']
+        self.tineye.logger.setLevel(logging.CRITICAL)
 
     def tearDown(self):
-        load_engines([])
+        searx.search.load_engines([])
 
     def test_status_code_raises(self):
         response = Mock()
         response.status_code = 401
         response.raise_for_status.side_effect = HTTPError()
-        self.assertRaises(HTTPError, lambda: tineye.response(response))
+        self.assertRaises(HTTPError, lambda: self.tineye.response(response))
 
     @parameterized.expand([(400), (422)])
     def test_returns_empty_list(self, status_code):
@@ -30,7 +36,7 @@ class TinEyeTests(SearxTestCase):  # pylint: disable=missing-class-docstring
         response.json.return_value = {}
         response.status_code = status_code
         response.raise_for_status.side_effect = HTTPError()
-        results = tineye.response(response)
+        results = self.tineye.response(response)
         self.assertEqual(0, len(results))
 
     def test_logs_format_for_422(self):
@@ -39,9 +45,9 @@ class TinEyeTests(SearxTestCase):  # pylint: disable=missing-class-docstring
         response.status_code = 422
         response.raise_for_status.side_effect = HTTPError()
 
-        with self.assertLogs(tineye.logger) as assert_logs_context:
-            tineye.response(response)
-            self.assertIn(tineye.FORMAT_NOT_SUPPORTED, ','.join(assert_logs_context.output))
+        with self.assertLogs(self.tineye.logger) as assert_logs_context:
+            self.tineye.response(response)
+            self.assertIn(self.tineye.FORMAT_NOT_SUPPORTED, ','.join(assert_logs_context.output))
 
     def test_logs_signature_for_422(self):
         response = Mock()
@@ -49,9 +55,9 @@ class TinEyeTests(SearxTestCase):  # pylint: disable=missing-class-docstring
         response.status_code = 422
         response.raise_for_status.side_effect = HTTPError()
 
-        with self.assertLogs(tineye.logger) as assert_logs_context:
-            tineye.response(response)
-            self.assertIn(tineye.NO_SIGNATURE_ERROR, ','.join(assert_logs_context.output))
+        with self.assertLogs(self.tineye.logger) as assert_logs_context:
+            self.tineye.response(response)
+            self.assertIn(self.tineye.NO_SIGNATURE_ERROR, ','.join(assert_logs_context.output))
 
     def test_logs_download_for_422(self):
         response = Mock()
@@ -59,9 +65,9 @@ class TinEyeTests(SearxTestCase):  # pylint: disable=missing-class-docstring
         response.status_code = 422
         response.raise_for_status.side_effect = HTTPError()
 
-        with self.assertLogs(tineye.logger) as assert_logs_context:
-            tineye.response(response)
-            self.assertIn(tineye.DOWNLOAD_ERROR, ','.join(assert_logs_context.output))
+        with self.assertLogs(self.tineye.logger) as assert_logs_context:
+            self.tineye.response(response)
+            self.assertIn(self.tineye.DOWNLOAD_ERROR, ','.join(assert_logs_context.output))
 
     def test_logs_description_for_400(self):
         description = 'There was a problem with that request. Error ID: ad5fc955-a934-43c1-8187-f9a61d301645'
@@ -70,8 +76,8 @@ class TinEyeTests(SearxTestCase):  # pylint: disable=missing-class-docstring
         response.status_code = 400
         response.raise_for_status.side_effect = HTTPError()
 
-        with self.assertLogs(tineye.logger) as assert_logs_context:
-            tineye.response(response)
+        with self.assertLogs(self.tineye.logger) as assert_logs_context:
+            self.tineye.response(response)
             self.assertIn(description, ','.join(assert_logs_context.output))
 
     def test_crawl_date_parses(self):
@@ -90,5 +96,5 @@ class TinEyeTests(SearxTestCase):  # pylint: disable=missing-class-docstring
             ]
         }
         response.status_code = 200
-        results = tineye.response(response)
+        results = self.tineye.response(response)
         self.assertEqual(date, results[0]['publishedDate'])
diff --git a/tests/unit/test_query.py b/tests/unit/test_query.py
index 601a6e60d..00c53edc7 100644
--- a/tests/unit/test_query.py
+++ b/tests/unit/test_query.py
@@ -2,7 +2,7 @@
 # pylint: disable=missing-module-docstring
 
 from parameterized.parameterized import parameterized
-from searx.engines import load_engines
+import searx.search
 from searx.query import RawTextQuery
 from tests import SearxTestCase
 
@@ -218,10 +218,10 @@ class TestBang(SearxTestCase):  # pylint:disable=missing-class-docstring
     THE_QUERY = 'the query'
 
     def setUp(self):
-        load_engines(TEST_ENGINES)
+        searx.search.initialize(TEST_ENGINES)
 
     def tearDown(self):
-        load_engines([])
+        searx.search.load_engines([])
 
     @parameterized.expand(SPECIFIC_BANGS)
     def test_bang(self, bang: str):
diff --git a/tests/unit/test_results.py b/tests/unit/test_results.py
index 608d3c8c3..740d36a03 100644
--- a/tests/unit/test_results.py
+++ b/tests/unit/test_results.py
@@ -2,7 +2,7 @@
 # pylint: disable=missing-module-docstring
 
 from searx.results import ResultContainer
-from searx.engines import load_engines
+import searx.search
 from tests import SearxTestCase
 
 
@@ -36,17 +36,16 @@ def fake_result(url='https://aa.bb/cc?dd=ee#ff', title='aaa', content='bbb', eng
 
 
 class ResultContainerTestCase(SearxTestCase):  # pylint: disable=missing-class-docstring
+
     def setUp(self) -> None:
         stract_engine = make_test_engine_dict(name="stract", engine="stract", shortcut="stra")
         duckduckgo_engine = make_test_engine_dict(name="duckduckgo", engine="duckduckgo", shortcut="ddg")
         mojeek_engine = make_test_engine_dict(name="mojeek", engine="mojeek", shortcut="mjk")
-
-        load_engines([stract_engine, duckduckgo_engine, mojeek_engine])
-
+        searx.search.initialize([stract_engine, duckduckgo_engine, mojeek_engine])
         self.container = ResultContainer()
 
     def tearDown(self):
-        load_engines([])
+        searx.search.load_engines([])
 
     def test_empty(self):
         self.assertEqual(self.container.get_ordered_results(), [])