add moroe tests

The issue appears in case if - somehow - unknown commit sha has been
stored. In this scenario it would try to fetch infinitely

src/ahriman/core/alpm/repo.py

@@ -66,7 +66,7 @@ class Repo(LazyLogging):
             path(Path): path to archive to add
         """
         check_output(
-            "repo-add", *self.sign_args, "-R", str(self.repo_path), str(path),
+            "repo-add", *self.sign_args, "--remove", str(self.repo_path), str(path),
             exception=BuildError.from_process(path.name),
             cwd=self.paths.repository,
             logger=self.logger,
@@ -76,8 +76,13 @@ class Repo(LazyLogging):
         """
         create empty repository database. It just calls add with empty arguments
         """
-        check_output("repo-add", *self.sign_args, str(self.repo_path),
-                     cwd=self.paths.repository, logger=self.logger, user=self.uid)
+        # since pacman-6.1.0 repo-add doesn't create empty database in case if no packages supplied
+        # this code creates empty files instead
+        if self.repo_path.exists():
+            return  # database is already created, skip this part
+
+        self.repo_path.touch(exist_ok=True)
+        (self.paths.repository / f"{self.name}.db").symlink_to(self.repo_path)
 
     def remove(self, package: str, filename: Path) -> None:
         """

tests/ahriman/core/alpm/test_repo.py

@@ -26,13 +26,28 @@ def test_repo_add(repo: Repo, mocker: MockerFixture) -> None:
 
 def test_repo_init(repo: Repo, mocker: MockerFixture) -> None:
     """
-    must call repo-add with empty package list on repo initializing
+    must create empty database files
     """
-    check_output_mock = mocker.patch("ahriman.core.alpm.repo.check_output")
+    mocker.patch("pathlib.Path.exists", return_value=False)
+    touch_mock = mocker.patch("pathlib.Path.touch")
+    symlink_mock = mocker.patch("pathlib.Path.symlink_to")
 
     repo.init()
-    check_output_mock.assert_called_once()  # it will be checked later
-    assert check_output_mock.call_args[0][0] == "repo-add"
+    touch_mock.assert_called_once_with(exist_ok=True)
+    symlink_mock.assert_called_once_with(repo.repo_path)
+
+
+def test_repo_init_skip(repo: Repo, mocker: MockerFixture) -> None:
+    """
+    must do not create files if database already exists
+    """
+    mocker.patch("pathlib.Path.exists", return_value=True)
+    touch_mock = mocker.patch("pathlib.Path.touch")
+    symlink_mock = mocker.patch("pathlib.Path.symlink_to")
+
+    repo.init()
+    touch_mock.assert_not_called()
+    symlink_mock.assert_not_called()
 
 
 def test_repo_remove(repo: Repo, mocker: MockerFixture) -> None: