diff --git a/.github/workflows/test-and-run.yml b/.github/workflows/test-and-run.yml
index b4327bf..93412a8 100644
--- a/.github/workflows/test-and-run.yml
+++ b/.github/workflows/test-and-run.yml
@@ -19,20 +19,24 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3
+    - name: Install poetry
+      uses: pipx install poetry
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
+        cache: poetry
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
+        poetry env use "${{ matrix.python-version }}"
+        poetry install
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        poetry run flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        python -m pytest tests/
+        poetry run pytest tests/
diff --git a/poetry.lock b/poetry.lock
index 48c1f45..ff1bd6f 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -8,7 +8,7 @@ python-versions = "*"
 
 [[package]]
 name = "astroid"
-version = "2.12.10"
+version = "2.12.11"
 description = "An abstract syntax tree for Python with inference support."
 category = "dev"
 optional = false
@@ -22,6 +22,20 @@ wrapt = [
     {version = ">=1.14,<2", markers = "python_version >= \"3.11\""},
 ]
 
+[[package]]
+name = "attrs"
+version = "22.1.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "cloudpickle"]
+
 [[package]]
 name = "babel"
 version = "2.10.3"
@@ -35,7 +49,7 @@ pytz = ">=2015.7"
 
 [[package]]
 name = "certifi"
-version = "2022.9.14"
+version = "2022.9.24"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "dev"
 optional = false
@@ -93,7 +107,7 @@ toml = ">=0.10.2"
 
 [[package]]
 name = "domdf-python-tools"
-version = "3.4.0"
+version = "3.5.0"
 description = "Helpful functions for Python 🐍 🛠️"
 category = "dev"
 optional = false
@@ -108,6 +122,19 @@ typing-extensions = ">=3.7.4.1"
 all = ["pytz (>=2019.1)"]
 dates = ["pytz (>=2019.1)"]
 
+[[package]]
+name = "flake8"
+version = "5.0.4"
+description = "the modular source code checker: pep8 pyflakes and co"
+category = "dev"
+optional = false
+python-versions = ">=3.6.1"
+
+[package.dependencies]
+mccabe = ">=0.7.0,<0.8.0"
+pycodestyle = ">=2.9.0,<2.10.0"
+pyflakes = ">=2.5.0,<2.6.0"
+
 [[package]]
 name = "idna"
 version = "3.4"
@@ -126,7 +153,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "importlib-metadata"
-version = "4.12.0"
+version = "5.0.0"
 description = "Read metadata from Python packages"
 category = "dev"
 optional = false
@@ -136,9 +163,17 @@ python-versions = ">=3.7"
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)"]
+docs = ["sphinx (>=3.5)", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "furo", "jaraco.tidelift (>=1.4)"]
 perf = ["ipython"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.3)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "importlib-resources (>=1.3)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "flake8 (<5)", "pytest-cov", "pytest-enabler (>=1.3)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)", "importlib-resources (>=1.3)"]
+
+[[package]]
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "dev"
+optional = false
+python-versions = "*"
 
 [[package]]
 name = "isort"
@@ -206,7 +241,7 @@ icu = ["PyICU (>=1.0.0)"]
 
 [[package]]
 name = "numpy"
-version = "1.23.3"
+version = "1.23.4"
 description = "NumPy is the fundamental package for array computing with Python."
 category = "main"
 optional = false
@@ -235,6 +270,42 @@ python-versions = ">=3.7"
 docs = ["furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)", "sphinx (>=4)"]
 test = ["appdirs (==1.4.4)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)", "pytest (>=6)"]
 
+[[package]]
+name = "pluggy"
+version = "1.0.0"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+testing = ["pytest-benchmark", "pytest"]
+dev = ["tox", "pre-commit"]
+
+[[package]]
+name = "py"
+version = "1.11.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "pycodestyle"
+version = "2.9.1"
+description = "Python style guide checker"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "pyflakes"
+version = "2.5.0"
+description = "passive checker of Python programs"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
 [[package]]
 name = "pygments"
 version = "2.13.0"
@@ -248,14 +319,14 @@ plugins = ["importlib-metadata"]
 
 [[package]]
 name = "pylint"
-version = "2.15.3"
+version = "2.15.4"
 description = "python code static checker"
 category = "dev"
 optional = false
 python-versions = ">=3.7.2"
 
 [package.dependencies]
-astroid = ">=2.12.10,<=2.14.0-dev0"
+astroid = ">=2.12.11,<=2.14.0-dev0"
 colorama = {version = ">=0.4.5", markers = "sys_platform == \"win32\""}
 dill = ">=0.2"
 isort = ">=4.2.5,<6"
@@ -280,9 +351,29 @@ python-versions = ">=3.6.8"
 [package.extras]
 diagrams = ["railroad-diagrams", "jinja2"]
 
+[[package]]
+name = "pytest"
+version = "7.1.3"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+py = ">=1.8.2"
+tomli = ">=1.0.0"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+
 [[package]]
 name = "pytz"
-version = "2022.2.1"
+version = "2022.5"
 description = "World timezone definitions, modern and historical"
 category = "dev"
 optional = false
@@ -447,7 +538,7 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "tomlkit"
-version = "0.11.4"
+version = "0.11.5"
 description = "Style preserving TOML library"
 category = "dev"
 optional = false
@@ -472,7 +563,7 @@ telegram = ["requests"]
 
 [[package]]
 name = "typing-extensions"
-version = "4.3.0"
+version = "4.4.0"
 description = "Backported and Experimental Type Hints for Python 3.7+"
 category = "dev"
 optional = false
@@ -501,20 +592,20 @@ python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [[package]]
 name = "zipp"
-version = "3.8.1"
+version = "3.9.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "jaraco.tidelift (>=1.4)"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.3)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
+docs = ["sphinx (>=3.5)", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "furo", "jaraco.tidelift (>=1.4)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "flake8 (<5)", "pytest-cov", "pytest-enabler (>=1.3)", "jaraco.itertools", "func-timeout", "jaraco.functools", "more-itertools", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
 
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.8,<4.0"
-content-hash = "e4e3cfd84e465ac87f13eaaf907054cd2afc86b8438bc7ed03414f7fbe11f06c"
+content-hash = "661f34d6e1eb0bdc9833c0eaf1b923cf618d916d4fa6f3c7e8bed3653d90784b"
 
 [metadata.files]
 alabaster = [
@@ -522,22 +613,29 @@ alabaster = [
     {file = "alabaster-0.7.12.tar.gz", hash = "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"},
 ]
 astroid = [
-    {file = "astroid-2.12.10-py3-none-any.whl", hash = "sha256:997e0c735df60d4a4caff27080a3afc51f9bdd693d3572a4a0b7090b645c36c5"},
-    {file = "astroid-2.12.10.tar.gz", hash = "sha256:81f870105d892e73bf535da77a8261aa5bde838fa4ed12bb2f435291a098c581"},
+    {file = "astroid-2.12.11-py3-none-any.whl", hash = "sha256:867a756bbf35b7bc07b35bfa6522acd01f91ad9919df675e8428072869792dce"},
+    {file = "astroid-2.12.11.tar.gz", hash = "sha256:2df4f9980c4511474687895cbfdb8558293c1a826d9118bb09233d7c2bff1c83"},
+]
+attrs = [
+    {file = "attrs-22.1.0-py2.py3-none-any.whl", hash = "sha256:86efa402f67bf2df34f51a335487cf46b1ec130d02b8d39fd248abfd30da551c"},
+    {file = "attrs-22.1.0.tar.gz", hash = "sha256:29adc2665447e5191d0e7c568fde78b21f9672d344281d0c6e1ab085429b22b6"},
 ]
 babel = [
     {file = "Babel-2.10.3-py3-none-any.whl", hash = "sha256:ff56f4892c1c4bf0d814575ea23471c230d544203c7748e8c68f0089478d48eb"},
     {file = "Babel-2.10.3.tar.gz", hash = "sha256:7614553711ee97490f732126dc077f8d0ae084ebc6a96e23db1482afabdb2c51"},
 ]
 certifi = [
-    {file = "certifi-2022.9.14-py3-none-any.whl", hash = "sha256:e232343de1ab72c2aa521b625c80f699e356830fd0e2c620b465b304b17b0516"},
-    {file = "certifi-2022.9.14.tar.gz", hash = "sha256:36973885b9542e6bd01dea287b2b4b3b21236307c56324fcc3f1160f2d655ed5"},
+    {file = "certifi-2022.9.24-py3-none-any.whl", hash = "sha256:90c1a32f1d68f940488354e36370f6cca89f0f106db09518524c88d6ed83f382"},
+    {file = "certifi-2022.9.24.tar.gz", hash = "sha256:0d9c601124e5a6ba9712dbc60d9c53c21e34f5f641fe83002317394311bdce14"},
 ]
 charset-normalizer = [
     {file = "charset-normalizer-2.1.1.tar.gz", hash = "sha256:5a3d016c7c547f69d6f81fb0db9449ce888b418b5b9952cc5e6e66843e9dd845"},
     {file = "charset_normalizer-2.1.1-py3-none-any.whl", hash = "sha256:83e9a75d1911279afd89352c68b45348559d1fc0506b054b346651b5e7fee29f"},
 ]
-colorama = []
+colorama = [
+    {file = "colorama-0.4.5-py2.py3-none-any.whl", hash = "sha256:854bf444933e37f5824ae7bfc1e98d5bce2ebe4160d46b5edf346a89358e99da"},
+    {file = "colorama-0.4.5.tar.gz", hash = "sha256:e6c6b4334fc50988a639d9b98aa429a0b57da6e17b9a44f0451f930b6967b7a4"},
+]
 dill = [
     {file = "dill-0.3.5.1-py2.py3-none-any.whl", hash = "sha256:33501d03270bbe410c72639b350e941882a8b0fd55357580fbc873fba0c59302"},
     {file = "dill-0.3.5.1.tar.gz", hash = "sha256:d75e41f3eff1eee599d738e76ba8f4ad98ea229db8b085318aa2b3333a208c86"},
@@ -551,8 +649,12 @@ dom-toml = [
     {file = "dom_toml-0.6.0.tar.gz", hash = "sha256:6f486ad979ec44814d7c6efb38d46301e100c8ad1a7f3524eca579ce48a0a6bc"},
 ]
 domdf-python-tools = [
-    {file = "domdf_python_tools-3.4.0-py3-none-any.whl", hash = "sha256:fe2cd1785964f079067d5fa90ae57bb481f1fc385216b629683c096d8de3282c"},
-    {file = "domdf_python_tools-3.4.0.tar.gz", hash = "sha256:0a0d7083c7f2d09c78239f7fe01900b546b26a2e7252775be66d402f9ab930b9"},
+    {file = "domdf_python_tools-3.5.0-py3-none-any.whl", hash = "sha256:51450c885ee8f02c7e53749a7105df8925dbf3ec0bd822899776a6f941ff8f01"},
+    {file = "domdf_python_tools-3.5.0.tar.gz", hash = "sha256:f449046055deea87613791a17249bf5d1969546c337c7df53bdf43ad99316b64"},
+]
+flake8 = [
+    {file = "flake8-5.0.4-py2.py3-none-any.whl", hash = "sha256:7a1cf6b73744f5806ab95e526f6f0d8c01c66d7bbe349562d22dfca20610b248"},
+    {file = "flake8-5.0.4.tar.gz", hash = "sha256:6fbe320aad8d6b95cec8b8e47bc933004678dc63095be98528b7bdd2a9f510db"},
 ]
 idna = [
     {file = "idna-3.4-py3-none-any.whl", hash = "sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2"},
@@ -563,8 +665,12 @@ imagesize = [
     {file = "imagesize-1.4.1.tar.gz", hash = "sha256:69150444affb9cb0d5cc5a92b3676f0b2fb7cd9ae39e947a5e11a36b4497cd4a"},
 ]
 importlib-metadata = [
-    {file = "importlib_metadata-4.12.0-py3-none-any.whl", hash = "sha256:7401a975809ea1fdc658c3aa4f78cc2195a0e019c5cbc4c06122884e9ae80c23"},
-    {file = "importlib_metadata-4.12.0.tar.gz", hash = "sha256:637245b8bab2b6502fcbc752cc4b7a6f6243bb02b31c5c26156ad103d3d45670"},
+    {file = "importlib_metadata-5.0.0-py3-none-any.whl", hash = "sha256:ddb0e35065e8938f867ed4928d0ae5bf2a53b7773871bfe6bcc7e4fcdc7dea43"},
+    {file = "importlib_metadata-5.0.0.tar.gz", hash = "sha256:da31db32b304314d044d3c12c79bd59e307889b287ad12ff387b3500835fc2ab"},
+]
+iniconfig = [
+    {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
+    {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
 ]
 isort = [
     {file = "isort-5.10.1-py3-none-any.whl", hash = "sha256:6f62d78e2f89b4500b080fe3a81690850cd254227f27f75c3a0c491a1f351ba7"},
@@ -664,54 +770,83 @@ natsort = [
     {file = "natsort-8.2.0.tar.gz", hash = "sha256:57f85b72c688b09e053cdac302dd5b5b53df5f73ae20b4874fcbffd8bf783d11"},
 ]
 numpy = [
-    {file = "numpy-1.23.3-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:c9f707b5bb73bf277d812ded9896f9512a43edff72712f31667d0a8c2f8e71ee"},
-    {file = "numpy-1.23.3-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:ffcf105ecdd9396e05a8e58e81faaaf34d3f9875f137c7372450baa5d77c9a54"},
-    {file = "numpy-1.23.3-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:0ea3f98a0ffce3f8f57675eb9119f3f4edb81888b6874bc1953f91e0b1d4f440"},
-    {file = "numpy-1.23.3-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:004f0efcb2fe1c0bd6ae1fcfc69cc8b6bf2407e0f18be308612007a0762b4089"},
-    {file = "numpy-1.23.3-cp310-cp310-win32.whl", hash = "sha256:98dcbc02e39b1658dc4b4508442a560fe3ca5ca0d989f0df062534e5ca3a5c1a"},
-    {file = "numpy-1.23.3-cp310-cp310-win_amd64.whl", hash = "sha256:39a664e3d26ea854211867d20ebcc8023257c1800ae89773cbba9f9e97bae036"},
-    {file = "numpy-1.23.3-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:1f27b5322ac4067e67c8f9378b41c746d8feac8bdd0e0ffede5324667b8a075c"},
-    {file = "numpy-1.23.3-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:2ad3ec9a748a8943e6eb4358201f7e1c12ede35f510b1a2221b70af4bb64295c"},
-    {file = "numpy-1.23.3-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:bdc9febce3e68b697d931941b263c59e0c74e8f18861f4064c1f712562903411"},
-    {file = "numpy-1.23.3-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:301c00cf5e60e08e04d842fc47df641d4a181e651c7135c50dc2762ffe293dbd"},
-    {file = "numpy-1.23.3-cp311-cp311-win32.whl", hash = "sha256:7cd1328e5bdf0dee621912f5833648e2daca72e3839ec1d6695e91089625f0b4"},
-    {file = "numpy-1.23.3-cp311-cp311-win_amd64.whl", hash = "sha256:8355fc10fd33a5a70981a5b8a0de51d10af3688d7a9e4a34fcc8fa0d7467bb7f"},
-    {file = "numpy-1.23.3-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:bc6e8da415f359b578b00bcfb1d08411c96e9a97f9e6c7adada554a0812a6cc6"},
-    {file = "numpy-1.23.3-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:22d43376ee0acd547f3149b9ec12eec2f0ca4a6ab2f61753c5b29bb3e795ac4d"},
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@@ -757,14 +892,17 @@ tomli = [
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@@ -836,6 +974,6 @@ wrapt = [
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diff --git a/pyproject.toml b/pyproject.toml
index 4987318..c7fa117 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,8 @@ sphinx = "^4"
 sphinx_pyproject = "0.1"
 jinja2 = "~3.0"
 pylint = "^2.5.2"
+flake8 = "^5"
+pytest = "^7"
 
 [build-system]
 requires = ["poetry>=1.1"]