diff --git a/examples/pyproject.toml b/examples/pyproject.toml
new file mode 100644
index 0000000..9b6e7fd
--- /dev/null
+++ b/examples/pyproject.toml
@@ -0,0 +1,3 @@
+# only for testing
+[build-system]
+requires = []
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..9b6e7fd
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+# only for testing
+[build-system]
+requires = []
diff --git a/test_build_requirements.py b/test_build_requirements.py
new file mode 100644
index 0000000..0ba0454
--- /dev/null
+++ b/test_build_requirements.py
@@ -0,0 +1,16 @@
+"""checks requirements consistency between PySDM and PySDM examples"""
+
+import tomllib
+from pathlib import Path
+
+from .utils import repo_path
+
+
+def test_build_requirements_with_examples():
+    """tests if build requirements in PySDM and PySDM examples matches"""
+    with open(Path(repo_path(), "pyproject.toml"), "rb") as proj_f:
+        with open(Path(repo_path(), "examples/pyproject.toml"), "rb") as examples_f:
+            assert (
+                tomllib.load(proj_f)["build-system"]["requires"]
+                == tomllib.load(examples_f)["build-system"]["requires"]
+            )
diff --git a/test_notebooks.py b/test_notebooks.py
index ba28eb4..c42f0da 100644
--- a/test_notebooks.py
+++ b/test_notebooks.py
@@ -11,15 +11,13 @@
 
 import gc
 import os
-import pathlib
 import warnings
 
 import nbformat
 import pint
 import pytest
-from git.cmd import Git
 
-from .utils import find_files
+from .utils import find_files, relative_path, repo_path
 
 with warnings.catch_warnings():
     warnings.filterwarnings("ignore")
@@ -28,28 +26,11 @@
 SI = pint.UnitRegistry()
 
 
-def _relative_path(absolute_path):
-    """returns a path relative to the repo base (converting backslashes to slashes on Windows)"""
-    relpath = os.path.relpath(absolute_path, _repo_path().absolute())
-    posixpath_to_make_it_usable_in_urls_even_on_windows = pathlib.Path(
-        relpath
-    ).as_posix()
-    return posixpath_to_make_it_usable_in_urls_even_on_windows
-
-
-def _repo_path():
-    """returns absolute path to the repo base (ignoring .git location if in a submodule)"""
-    path = pathlib.Path(__file__)
-    while not (path.is_dir() and Git(path).rev_parse("--git-dir") == ".git"):
-        path = path.parent
-    return path
-
-
 COLAB_HEADER = f"""import sys
 if 'google.colab' in sys.modules:
     !pip --quiet install open-atmos-jupyter-utils
     from open_atmos_jupyter_utils import pip_install_on_colab
-    pip_install_on_colab('{_repo_path().name}-examples')"""
+    pip_install_on_colab('{repo_path().name}-examples')"""
 
 
 @pytest.fixture(
@@ -119,8 +100,8 @@ def _preview_badge_markdown(absolute_path):
         + "label=render%20on&logo=github&color=87ce3e&message=GitHub"
     )
     link = (
-        f"https://github.com/open-atmos/{_repo_path().name}/blob/main/"
-        + f"{_relative_path(absolute_path)}"
+        f"https://github.com/open-atmos/{repo_path().name}/blob/main/"
+        + f"{relative_path(absolute_path)}"
     )
     return f"[![preview notebook]({svg_badge_url})]({link})"
 
@@ -128,8 +109,8 @@ def _preview_badge_markdown(absolute_path):
 def _mybinder_badge_markdown(abslute_path):
     svg_badge_url = "https://mybinder.org/badge_logo.svg"
     link = (
-        f"https://mybinder.org/v2/gh/open-atmos/{_repo_path().name}.git/main?urlpath=lab/tree/"
-        + f"{_relative_path(abslute_path)}"
+        f"https://mybinder.org/v2/gh/open-atmos/{repo_path().name}.git/main?urlpath=lab/tree/"
+        + f"{relative_path(abslute_path)}"
     )
     return f"[![launch on mybinder.org]({svg_badge_url})]({link})"
 
@@ -137,8 +118,8 @@ def _mybinder_badge_markdown(abslute_path):
 def _colab_badge_markdown(absolute_path):
     svg_badge_url = "https://colab.research.google.com/assets/colab-badge.svg"
     link = (
-        f"https://colab.research.google.com/github/open-atmos/{_repo_path().name}/blob/main/"
-        + f"{_relative_path(absolute_path)}"
+        f"https://colab.research.google.com/github/open-atmos/{repo_path().name}/blob/main/"
+        + f"{relative_path(absolute_path)}"
     )
     return f"[![launch on Colab]({svg_badge_url})]({link})"
 
diff --git a/utils.py b/utils.py
index 50e0cf6..98eaa51 100644
--- a/utils.py
+++ b/utils.py
@@ -3,10 +3,28 @@
 """
 
 import os
+import pathlib
 
 from git.cmd import Git
 
 
+def relative_path(absolute_path):
+    """returns a path relative to the repo base (converting backslashes to slashes on Windows)"""
+    relpath = os.path.relpath(absolute_path, repo_path().absolute())
+    posixpath_to_make_it_usable_in_urls_even_on_windows = pathlib.Path(
+        relpath
+    ).as_posix()
+    return posixpath_to_make_it_usable_in_urls_even_on_windows
+
+
+def repo_path():
+    """returns absolute path to the repo base (ignoring .git location if in a submodule)"""
+    path = pathlib.Path(__file__)
+    while not (path.is_dir() and Git(path).rev_parse("--git-dir") == ".git"):
+        path = path.parent
+    return path
+
+
 def find_files(path_to_folder_from_project_root=".", file_extension=None):
     """
     Returns all files in a current git repo.