diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 52e212a..cedc3fe 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -70,18 +70,26 @@ jobs:
 
     - name: check code style
       run: |
+        set -eux
+        
         pdm run lint
 
         pdm run autopep8 -v --exit-code --recursive --diff kleinanzeigen_bot tests
 
     - name: run unit tests
       run: |
+        pdm run utest
+        
+    - name: run integration tests
+      run: |
+        set -eux
+        
         case "${{ matrix.os }}" in
            ubuntu-*) 
               sudo apt-get install -o Acquire::Retries=3 --no-install-recommends -y xvfb
-              xvfb-run pdm run test
+              xvfb-run pdm run itest
               ;;
-           *) pdm run test
+           *) pdm run itest
               ;;
         esac
 
diff --git a/README.md b/README.md
index 546e9bb..71c95a1 100644
--- a/README.md
+++ b/README.md
@@ -295,9 +295,12 @@ updated_on: # set automatically
 > Please read [CONTRIBUTING.md](CONTRIBUTING.md) before contributing code. Thank you!
 
 - Format source code: `pdm run format`
-- Running unit tests: `pdm run test`
-- Running linter: `pdm run lint`
-- Creating platform-specific executable: `pdm run compile`
+- Run tests:
+  - unit tests: `pdm run utest`
+  - integration tests: `pdm run itest`
+  - all tests: `pdm run test`
+- Run linter: `pdm run lint`
+- Create platform-specific executable: `pdm run compile`
 - Application bootstrap works like this:
   ```python
   pdm run app
diff --git a/pyproject.toml b/pyproject.toml
index 6d189b7..5ed4abb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,7 +73,8 @@ format = "autopep8 --recursive --in-place kleinanzeigen_bot tests"
 lint = "pylint -v kleinanzeigen_bot tests"
 scan = "bandit -c pyproject.toml -r kleinanzeigen_bot"
 test = "python -m pytest --capture=tee-sys -v"
-
+utest = "python -m pytest --capture=tee-sys -v -m 'not itest'"
+itest = "python -m pytest --capture=tee-sys -v -m 'itest'"
 
 #####################
 # autopep8
@@ -91,6 +92,7 @@ ignore = [ # https://github.com/hhatto/autopep8#features
 ]
 aggressive = 3
 
+
 #####################
 # bandit
 # https://pypi.org/project/bandit/
@@ -161,4 +163,7 @@ max-statements = 70
 #####################
 [tool.pytest.ini_options]
 # https://docs.pytest.org/en/stable/reference.html#confval-addopts
-addopts = "-p no:cacheprovider --doctest-modules --ignore=__pypackages__ --ignore=kleinanzeigen_bot/__main__.py"
+addopts = "--strict-markers -p no:cacheprovider --doctest-modules --ignore=__pypackages__ --ignore=kleinanzeigen_bot/__main__.py"
+markers = [
+    "itest: marks a test as an integration test (i.e. a test with external dependencies)"
+]
\ No newline at end of file
diff --git a/tests/test_selenium_mixin.py b/tests/test_selenium_mixin.py
index a65677d..a1206d2 100644
--- a/tests/test_selenium_mixin.py
+++ b/tests/test_selenium_mixin.py
@@ -2,10 +2,13 @@
 Copyright (C) 2022 Sebastian Thomschke and contributors
 SPDX-License-Identifier: AGPL-3.0-or-later
 """
+import pytest
+
 from kleinanzeigen_bot.selenium_mixin import SeleniumMixin
 from kleinanzeigen_bot import utils
 
 
+@pytest.mark.itest
 def test_webdriver_auto_init():
     selenium_mixin = SeleniumMixin()