unify aur.search method

due to specific of the AUR API in order to reduce the code we are using
own wrapper and work with it instead of direct library calls

tests/ahriman/core/test_util.py

@@ -1,3 +1,4 @@
+import aur
 import datetime
 import logging
 import pytest
@@ -5,12 +6,45 @@ import subprocess
 
 from pathlib import Path
 from pytest_mock import MockerFixture
+from unittest import mock
 
 from ahriman.core.exceptions import InvalidOption, UnsafeRun
-from ahriman.core.util import check_output, check_user, filter_json, package_like, pretty_datetime, pretty_size, walk
+from ahriman.core.util import aur_search, check_output, check_user, filter_json, package_like, pretty_datetime, \
+    pretty_size, walk
 from ahriman.models.package import Package
 
 
+def test_aur_search(aur_package_ahriman: aur.Package, mocker: MockerFixture) -> None:
+    """
+    must search in AUR with multiple words
+    """
+    terms = ["ahriman", "is", "cool"]
+    search_mock = mocker.patch("aur.search", return_value=[aur_package_ahriman])
+
+    assert aur_search(*terms) == [aur_package_ahriman]
+    search_mock.assert_has_calls([mock.call("ahriman"), mock.call("cool")])
+
+
+def test_aur_search_empty(mocker: MockerFixture) -> None:
+    """
+    must return empty list if no long terms supplied
+    """
+    terms = ["it", "is"]
+    search_mock = mocker.patch("aur.search")
+
+    assert aur_search(*terms) == []
+    search_mock.assert_not_called()
+
+
+def test_aur_search_single(aur_package_ahriman: aur.Package, mocker: MockerFixture) -> None:
+    """
+    must search in AUR with one word
+    """
+    search_mock = mocker.patch("aur.search", return_value=[aur_package_ahriman])
+    assert aur_search("ahriman") == [aur_package_ahriman]
+    search_mock.assert_called_once_with("ahriman")
+
+
 def test_check_output(mocker: MockerFixture) -> None:
     """
     must run command and log result