diff --git a/src/ahriman/application/application.py b/src/ahriman/application/application.py
index 660bdb13..76dd36ea 100644
--- a/src/ahriman/application/application.py
+++ b/src/ahriman/application/application.py
@@ -102,7 +102,7 @@ class Application:
         known_packages = self._known_packages()
 
         def add_directory(path: Path) -> None:
-            for full_path in filter(lambda p: package_like(p.name), path.iterdir()):
+            for full_path in filter(package_like, path.iterdir()):
                 add_archive(full_path)
 
         def add_manual(name: str) -> Path:
@@ -192,8 +192,7 @@ class Application:
         process_update(packages)
 
         # process manual packages
-        tree = Tree()
-        tree.load(updates)
+        tree = Tree.load(updates)
         for num, level in enumerate(tree.levels()):
             self.logger.info(f"processing level #{num} {[package.base for package in level]}")
             packages = self.repository.process_build(level)
diff --git a/src/ahriman/core/configuration.py b/src/ahriman/core/configuration.py
index 918c51ad..78e7d4a2 100644
--- a/src/ahriman/core/configuration.py
+++ b/src/ahriman/core/configuration.py
@@ -55,7 +55,8 @@ class Configuration(configparser.RawConfigParser):
         """
         :return: path to directory with configuration includes
         """
-        return Path(self.get("settings", "include"))
+        value = Path(self.get("settings", "include"))
+        return self.absolute_path_for(value)
 
     @classmethod
     def from_path(cls: Type[Configuration], path: Path, logfile: bool) -> Configuration:
@@ -70,6 +71,16 @@ class Configuration(configparser.RawConfigParser):
         config.load_logging(logfile)
         return config
 
+    def absolute_path_for(self, path_part: Path) -> Path:
+        """
+        helper to generate absolute configuration path for relative settings value
+        :param path_part: path to generate
+        :return: absolute path according to current path configuration
+        """
+        if self.path is None or path_part.is_absolute():
+            return path_part
+        return self.path.parent / path_part
+
     def dump(self, architecture: str) -> Dict[str, Dict[str, str]]:
         """
         dump configuration to dictionary
@@ -137,8 +148,10 @@ class Configuration(configparser.RawConfigParser):
         """
         def file_logger() -> None:
             try:
-                fileConfig(self.get("settings", "logging"))
-            except PermissionError:
+                value = Path(self.get("settings", "logging"))
+                config_path = self.absolute_path_for(value)
+                fileConfig(config_path)
+            except (FileNotFoundError, PermissionError):
                 console_logger()
                 logging.exception("could not create logfile, fallback to stderr")
 
diff --git a/src/ahriman/core/repository/repository.py b/src/ahriman/core/repository/repository.py
index 89f6d966..9db61d4a 100644
--- a/src/ahriman/core/repository/repository.py
+++ b/src/ahriman/core/repository/repository.py
@@ -38,7 +38,7 @@ class Repository(Executor, UpdateHandler):
         """
         result: Dict[str, Package] = {}
         for full_path in self.paths.repository.iterdir():
-            if not package_like(full_path.name):
+            if not package_like(full_path):
                 continue
             try:
                 local = Package.load(full_path, self.pacman, self.aur_url)
diff --git a/src/ahriman/core/tree.py b/src/ahriman/core/tree.py
index 85a21451..940891cd 100644
--- a/src/ahriman/core/tree.py
+++ b/src/ahriman/core/tree.py
@@ -23,7 +23,7 @@ import shutil
 import tempfile
 
 from pathlib import Path
-from typing import Iterable, List, Set
+from typing import Iterable, List, Set, Type
 
 from ahriman.core.build_tools.task import Task
 from ahriman.models.package import Package
@@ -36,13 +36,14 @@ class Leaf:
     :ivar package: leaf package properties
     """
 
-    def __init__(self, package: Package) -> None:
+    def __init__(self, package: Package, dependencies: Set[str]) -> None:
         """
         default constructor
         :param package: package properties
+        :param dependencies: package dependencies
         """
         self.package = package
-        self.dependencies: Set[str] = set()
+        self.dependencies = dependencies
 
     @property
     def items(self) -> Iterable[str]:
@@ -51,6 +52,21 @@ class Leaf:
         """
         return self.package.packages.keys()
 
+    @classmethod
+    def load(cls: Type[Leaf], package: Package) -> Leaf:
+        """
+        load leaf from package with dependencies
+        :param package: package properties
+        :return: loaded class
+        """
+        clone_dir = Path(tempfile.mkdtemp())
+        try:
+            Task.fetch(clone_dir, package.git_url)
+            dependencies = Package.dependencies(clone_dir)
+        finally:
+            shutil.rmtree(clone_dir, ignore_errors=True)
+        return cls(package, dependencies)
+
     def is_root(self, packages: Iterable[Leaf]) -> bool:
         """
         check if package depends on any other package from list of not
@@ -62,17 +78,6 @@ class Leaf:
                 return False
         return True
 
-    def load_dependencies(self) -> None:
-        """
-        load dependencies for the leaf
-        """
-        clone_dir = Path(tempfile.mkdtemp())
-        try:
-            Task.fetch(clone_dir, self.package.git_url)
-            self.dependencies = Package.dependencies(clone_dir)
-        finally:
-            shutil.rmtree(clone_dir, ignore_errors=True)
-
 
 class Tree:
     """
@@ -80,11 +85,21 @@ class Tree:
     :ivar leaves: list of tree leaves
     """
 
-    def __init__(self) -> None:
+    def __init__(self, leaves: List[Leaf]) -> None:
         """
         default constructor
+        :param leaves: leaves to build the tree
         """
-        self.leaves: List[Leaf] = []
+        self.leaves = leaves
+
+    @classmethod
+    def load(cls: Type[Tree], packages: Iterable[Package]) -> Tree:
+        """
+        load tree from packages
+        :param packages: packages list
+        :return: loaded class
+        """
+        return cls([Leaf.load(package) for package in packages])
 
     def levels(self) -> List[List[Package]]:
         """
@@ -99,13 +114,3 @@ class Tree:
             unprocessed = [leaf for leaf in unprocessed if not leaf.is_root(unprocessed)]
 
         return result
-
-    def load(self, packages: Iterable[Package]) -> None:
-        """
-        load tree from packages
-        :param packages: packages list
-        """
-        for package in packages:
-            leaf = Leaf(package)
-            leaf.load_dependencies()
-            self.leaves.append(leaf)
diff --git a/src/ahriman/core/util.py b/src/ahriman/core/util.py
index e12d914c..bd4b761f 100644
--- a/src/ahriman/core/util.py
+++ b/src/ahriman/core/util.py
@@ -28,19 +28,17 @@ from ahriman.core.exceptions import InvalidOption
 
 
 def check_output(*args: str, exception: Optional[Exception],
-                 cwd: Optional[Path] = None, stderr: int = subprocess.STDOUT,
-                 logger: Optional[Logger] = None) -> str:
+                 cwd: Optional[Path] = None, logger: Optional[Logger] = None) -> str:
     """
     subprocess wrapper
     :param args: command line arguments
     :param exception: exception which has to be reraised instead of default subprocess exception
     :param cwd: current working directory
-    :param stderr: standard error output mode
     :param logger: logger to log command result if required
     :return: command output
     """
     try:
-        result = subprocess.check_output(args, cwd=cwd, stderr=stderr).decode("utf8").strip()
+        result = subprocess.check_output(args, cwd=cwd, stderr=subprocess.STDOUT).decode("utf8").strip()
         if logger is not None:
             for line in result.splitlines():
                 logger.debug(line)
@@ -52,13 +50,14 @@ def check_output(*args: str, exception: Optional[Exception],
     return result
 
 
-def package_like(filename: str) -> bool:
+def package_like(filename: Path) -> bool:
     """
     check if file looks like package
     :param filename: name of file to check
     :return: True in case if name contains `.pkg.` and not signature, False otherwise
     """
-    return ".pkg." in filename and not filename.endswith(".sig")
+    name = filename.name
+    return ".pkg." in name and not name.endswith(".sig")
 
 
 def pretty_datetime(timestamp: Optional[int]) -> str:
@@ -86,10 +85,10 @@ def pretty_size(size: Optional[float], level: int = 0) -> str:
             return "MiB"
         if level == 3:
             return "GiB"
-        raise InvalidOption(level)  # I hope it will not be more than 1024 GiB
+        raise InvalidOption(level)  # must never happen actually
 
     if size is None:
         return ""
-    if size < 1024:
-        return f"{round(size, 2)} {str_level()}"
+    if size < 1024 or level == 3:
+        return f"{size:.1f} {str_level()}"
     return pretty_size(size / 1024, level + 1)
diff --git a/src/ahriman/models/package_desciption.py b/src/ahriman/models/package_desciption.py
index 8f77b620..34aa0792 100644
--- a/src/ahriman/models/package_desciption.py
+++ b/src/ahriman/models/package_desciption.py
@@ -18,6 +18,7 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 #
 from dataclasses import dataclass
+from pathlib import Path
 from typing import Optional
 
 
@@ -35,3 +36,10 @@ class PackageDescription:
     build_date: Optional[int] = None
     filename: Optional[str] = None
     installed_size: Optional[int] = None
+
+    @property
+    def filepath(self) -> Optional[Path]:
+        """
+        :return: path object for current filename
+        """
+        return Path(self.filename) if self.filename is not None else None
diff --git a/tests/ahriman/core/conftest.py b/tests/ahriman/core/conftest.py
index a05582f9..6ae80a27 100644
--- a/tests/ahriman/core/conftest.py
+++ b/tests/ahriman/core/conftest.py
@@ -6,6 +6,7 @@ from ahriman.core.alpm.pacman import Pacman
 from ahriman.core.alpm.repo import Repo
 from ahriman.core.build_tools.task import Task
 from ahriman.core.configuration import Configuration
+from ahriman.core.tree import Leaf
 from ahriman.models.package import Package
 from ahriman.models.repository_paths import RepositoryPaths
 
@@ -16,6 +17,16 @@ def configuration(resource_path_root: Path) -> Configuration:
     return Configuration.from_path(path=path, logfile=False)
 
 
+@pytest.fixture
+def leaf_ahriman(package_ahriman: Package) -> Leaf:
+    return Leaf(package_ahriman, set())
+
+
+@pytest.fixture
+def leaf_python_schedule(package_python_schedule: Package) -> Leaf:
+    return Leaf(package_python_schedule, set())
+
+
 @pytest.fixture
 def pacman(configuration: Configuration) -> Pacman:
     return Pacman(configuration)
diff --git a/tests/ahriman/core/test_configuration.py b/tests/ahriman/core/test_configuration.py
new file mode 100644
index 00000000..bb29eb58
--- /dev/null
+++ b/tests/ahriman/core/test_configuration.py
@@ -0,0 +1,127 @@
+from pathlib import Path
+
+from pytest_mock import MockerFixture
+
+from ahriman.core.configuration import Configuration
+
+
+def test_from_path(mocker: MockerFixture) -> None:
+    """
+    must load configuration
+    """
+    read_mock = mocker.patch("configparser.RawConfigParser.read")
+    load_includes_mock = mocker.patch("ahriman.core.configuration.Configuration.load_includes")
+    load_logging_mock = mocker.patch("ahriman.core.configuration.Configuration.load_logging")
+    path = Path("path")
+
+    config = Configuration.from_path(path, True)
+    assert config.path == path
+    read_mock.assert_called_with(path)
+    load_includes_mock.assert_called_once()
+    load_logging_mock.assert_called_once()
+
+
+def test_absolute_path_for_absolute(configuration: Configuration) -> None:
+    """
+    must not change path for absolute path in settings
+    """
+    path = Path("/a/b/c")
+    assert configuration.absolute_path_for(path) == path
+
+
+def test_absolute_path_for_relative(configuration: Configuration) -> None:
+    """
+    must prepend root path to relative path
+    """
+    path = Path("a")
+    result = configuration.absolute_path_for(path)
+    assert result.is_absolute()
+    assert result.parent == configuration.path.parent
+    assert result.name == path.name
+
+
+def test_dump(configuration: Configuration) -> None:
+    """
+    dump must not be empty
+    """
+    assert configuration.dump("x86_64")
+
+
+def test_dump_architecture_specific(configuration: Configuration) -> None:
+    """
+    dump must contain architecture specific settings
+    """
+    configuration.add_section("build_x86_64")
+    configuration.set("build_x86_64", "archbuild_flags", "")
+
+    dump = configuration.dump("x86_64")
+    assert dump
+    assert "build" not in dump
+    assert "build_x86_64" in dump
+
+
+def test_getlist(configuration: Configuration) -> None:
+    """
+    must return list of string correctly
+    """
+    configuration.set("build", "test_list", "a b c")
+    assert configuration.getlist("build", "test_list") == ["a", "b", "c"]
+
+
+def test_getlist_empty(configuration: Configuration) -> None:
+    """
+    must return list of string correctly for non-existing option
+    """
+    assert configuration.getlist("build", "test_list") == []
+    configuration.set("build", "test_list", "")
+    assert configuration.getlist("build", "test_list") == []
+
+
+def test_getlist_single(configuration: Configuration) -> None:
+    """
+    must return list of strings for single string
+    """
+    configuration.set("build", "test_list", "a")
+    assert configuration.getlist("build", "test_list") == ["a"]
+
+
+def test_get_section_name(configuration: Configuration) -> None:
+    """
+    must return architecture specific group
+    """
+    configuration.add_section("build_x86_64")
+    configuration.set("build_x86_64", "archbuild_flags", "")
+    assert configuration.get_section_name("build", "x86_64") == "build_x86_64"
+
+
+def test_get_section_name_missing(configuration: Configuration) -> None:
+    """
+    must return default group if architecture depending group does not exist
+    """
+    assert configuration.get_section_name("prefix", "suffix") == "prefix"
+    assert configuration.get_section_name("build", "x86_64") == "build"
+
+
+def test_load_includes_missing(configuration: Configuration) -> None:
+    """
+    must not fail if not include directory found
+    """
+    configuration.set("settings", "include", "path")
+    configuration.load_includes()
+
+
+def test_load_logging_fallback(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must fallback to stderr without errors
+    """
+    mocker.patch("logging.config.fileConfig", side_effect=PermissionError())
+    configuration.load_logging(True)
+
+
+def test_load_logging_stderr(configuration: Configuration, mocker: MockerFixture) -> None:
+    """
+    must use stderr if flag set
+    """
+    logging_mock = mocker.patch("logging.config.fileConfig")
+    configuration.load_logging(False)
+    logging_mock.assert_not_called()
diff --git a/tests/ahriman/core/test_tree.py b/tests/ahriman/core/test_tree.py
new file mode 100644
index 00000000..f6dc7069
--- /dev/null
+++ b/tests/ahriman/core/test_tree.py
@@ -0,0 +1,78 @@
+from pytest_mock import MockerFixture
+
+from ahriman.core.tree import Leaf, Tree
+from ahriman.models.package import Package
+
+
+def test_leaf_is_root_empty(leaf_ahriman: Leaf) -> None:
+    """
+    must be root for empty packages list
+    """
+    assert leaf_ahriman.is_root([])
+
+
+def test_leaf_is_root_false(leaf_ahriman: Leaf, leaf_python_schedule: Leaf) -> None:
+    """
+    must be root for empty dependencies list or if does not depend on packages
+    """
+    assert leaf_ahriman.is_root([leaf_python_schedule])
+    leaf_ahriman.dependencies = {"ahriman-dependency"}
+    assert leaf_ahriman.is_root([leaf_python_schedule])
+
+
+def test_leaf_is_root_true(leaf_ahriman: Leaf, leaf_python_schedule: Leaf) -> None:
+    """
+    must not be root if depends on packages
+    """
+    leaf_ahriman.dependencies = {"python-schedule"}
+    assert not leaf_ahriman.is_root([leaf_python_schedule])
+
+    leaf_ahriman.dependencies = {"python2-schedule"}
+    assert not leaf_ahriman.is_root([leaf_python_schedule])
+
+    leaf_ahriman.dependencies = set(leaf_python_schedule.package.packages.keys())
+    assert not leaf_ahriman.is_root([leaf_python_schedule])
+
+
+def test_leaf_load(package_ahriman: Package, mocker: MockerFixture) -> None:
+    """
+    must load with dependencies
+    """
+    tempdir_mock = mocker.patch("tempfile.mkdtemp")
+    fetch_mock = mocker.patch("ahriman.core.build_tools.task.Task.fetch")
+    dependencies_mock = mocker.patch("ahriman.models.package.Package.dependencies", return_value={"ahriman-dependency"})
+    rmtree_mock = mocker.patch("shutil.rmtree")
+
+    leaf = Leaf.load(package_ahriman)
+    assert leaf.package == package_ahriman
+    assert leaf.dependencies == {"ahriman-dependency"}
+    tempdir_mock.assert_called_once()
+    fetch_mock.assert_called_once()
+    dependencies_mock.assert_called_once()
+    rmtree_mock.assert_called_once()
+
+
+def test_tree_levels(leaf_ahriman: Leaf, leaf_python_schedule: Leaf, mocker: MockerFixture) -> None:
+    """
+    must generate correct levels in the simples case
+    """
+    leaf_ahriman.dependencies = set(leaf_python_schedule.package.packages.keys())
+
+    tree = Tree([leaf_ahriman, leaf_python_schedule])
+    assert len(tree.levels()) == 2
+    first, second = tree.levels()
+    assert first == [leaf_python_schedule.package]
+    assert second == [leaf_ahriman.package]
+
+
+def test_tree_load(package_ahriman: Package, package_python_schedule: Package, mocker: MockerFixture) -> None:
+    """
+    must package list
+    """
+    mocker.patch("tempfile.mkdtemp")
+    mocker.patch("ahriman.core.build_tools.task.Task.fetch")
+    mocker.patch("ahriman.models.package.Package.dependencies")
+    mocker.patch("shutil.rmtree")
+
+    tree = Tree.load([package_ahriman, package_python_schedule])
+    assert len(tree.leaves) == 2
diff --git a/tests/ahriman/core/test_util.py b/tests/ahriman/core/test_util.py
new file mode 100644
index 00000000..e79ce29e
--- /dev/null
+++ b/tests/ahriman/core/test_util.py
@@ -0,0 +1,131 @@
+import logging
+import pytest
+import subprocess
+
+from pytest_mock import MockerFixture
+
+from ahriman.core.util import check_output, package_like, pretty_datetime, pretty_size
+from ahriman.models.package import Package
+
+
+def test_check_output(mocker: MockerFixture) -> None:
+    """
+    must run command and log result
+    """
+    logger_mock = mocker.patch("logging.Logger.debug")
+
+    assert check_output("echo", "hello", exception=None) == "hello"
+    logger_mock.assert_not_called()
+
+    assert check_output("echo", "hello", exception=None, logger=logging.getLogger("")) == "hello"
+    logger_mock.assert_called_once()
+
+
+def test_check_output_failure(mocker: MockerFixture) -> None:
+    """
+    must process exception correctly
+    """
+    logger_mock = mocker.patch("logging.Logger.debug")
+    mocker.patch("subprocess.check_output", side_effect=subprocess.CalledProcessError(1, "echo"))
+
+    with pytest.raises(subprocess.CalledProcessError):
+        check_output("echo", "hello", exception=None)
+        logger_mock.assert_not_called()
+
+    with pytest.raises(subprocess.CalledProcessError):
+        check_output("echo", "hello", exception=None, logger=logging.getLogger(""))
+        logger_mock.assert_not_called()
+
+
+def test_check_output_failure_log(mocker: MockerFixture) -> None:
+    """
+    must process exception correctly and log it
+    """
+    logger_mock = mocker.patch("logging.Logger.debug")
+    mocker.patch("subprocess.check_output", side_effect=subprocess.CalledProcessError(1, "echo", output=b"result"))
+
+    with pytest.raises(subprocess.CalledProcessError):
+        check_output("echo", "hello", exception=None, logger=logging.getLogger(""))
+        logger_mock.assert_called_once()
+
+
+def test_package_like(package_ahriman: Package) -> None:
+    """
+    package_like must return true for archives
+    """
+    assert package_like(package_ahriman.packages[package_ahriman.base].filepath)
+
+
+def test_package_like_sig(package_ahriman: Package) -> None:
+    """
+    package_like must return false for signature files
+    """
+    package_file = package_ahriman.packages[package_ahriman.base].filepath
+    sig_file = package_file.parent / f"{package_file.name}.sig"
+    assert not package_like(sig_file)
+
+
+def test_pretty_datetime() -> None:
+    """
+    must generate string from timestamp value
+    """
+    assert pretty_datetime(0) == "1970-01-01 00:00:00"
+
+
+def test_pretty_datetime_empty() -> None:
+    """
+    must generate empty string from None timestamp
+    """
+    assert pretty_datetime(None) == ""
+
+
+def test_pretty_size_bytes() -> None:
+    """
+    must generate bytes string for bytes value
+    """
+    value, abbrev = pretty_size(42).split()
+    assert value == "42.0"
+    assert abbrev == "B"
+
+
+def test_pretty_size_kbytes() -> None:
+    """
+    must generate kibibytes string for kibibytes value
+    """
+    value, abbrev = pretty_size(42 * 1024).split()
+    assert value == "42.0"
+    assert abbrev == "KiB"
+
+
+def test_pretty_size_mbytes() -> None:
+    """
+    must generate mebibytes string for mebibytes value
+    """
+    value, abbrev = pretty_size(42 * 1024 * 1024).split()
+    assert value == "42.0"
+    assert abbrev == "MiB"
+
+
+def test_pretty_size_gbytes() -> None:
+    """
+    must generate gibibytes string for gibibytes value
+    """
+    value, abbrev = pretty_size(42 * 1024 * 1024 * 1024).split()
+    assert value == "42.0"
+    assert abbrev == "GiB"
+
+
+def test_pretty_size_pbytes() -> None:
+    """
+    must generate pebibytes string for pebibytes value
+    """
+    value, abbrev = pretty_size(42 * 1024 * 1024 * 1024 * 1024).split()
+    assert value == "43008.0"
+    assert abbrev == "GiB"
+
+
+def test_pretty_size_empty() -> None:
+    """
+    must generate empty string for None value
+    """
+    assert pretty_size(None) == ""
diff --git a/tests/ahriman/models/test_package_desciption.py b/tests/ahriman/models/test_package_desciption.py
index e69de29b..5808f752 100644
--- a/tests/ahriman/models/test_package_desciption.py
+++ b/tests/ahriman/models/test_package_desciption.py
@@ -0,0 +1,17 @@
+from ahriman.models.package_desciption import PackageDescription
+
+
+def test_filepath(package_description_ahriman: PackageDescription) -> None:
+    """
+    must generate correct filepath if set
+    """
+    assert package_description_ahriman.filepath is not None
+    assert package_description_ahriman.filepath.name == package_description_ahriman.filename
+
+
+def test_filepath_empty(package_description_ahriman: PackageDescription) -> None:
+    """
+    must return None for missing filename
+    """
+    package_description_ahriman.filename = None
+    assert package_description_ahriman.filepath is None