diff --git a/pytest_copie/plugin.py b/pytest_copie/plugin.py
index d1de9c3..f56bcd9 100644
--- a/pytest_copie/plugin.py
+++ b/pytest_copie/plugin.py
@@ -89,20 +89,20 @@ def copie(self, extra_context: Any = None, template: Any = None) -> Result:
 @pytest.fixture
 def _copier_config_file(tmp_path_factory):
     """Return a temporary copier config file."""
+    # create a user from the tmp_path_factory fixture
     user_dir = tmp_path_factory.mktemp("user_dir")
-    config_file = user_dir / "config"
 
-    copier_dir = user_dir / "copier"
-    copier_dir.mkdir()
-    replay_dir = user_dir / "replay_dir"
-    replay_dir.mkdir()
+    # create the different folders and files
+    (copier_dir := user_dir / "copier").mkdir()
+    (replay_dir := user_dir / "replay_dir").mkdir()
+
+    # set up the configuration parameters in a config file
     config = {
         "copier_dir": str(copier_dir),
         "replay_dir": str(replay_dir),
     }
 
-    with config_file.open("w") as f:
-        yaml.dump(config, f, Dumper=yaml.Dumper)
+    (config_file := user_dir / "config").write_text(yaml.dump(config))
 
     return config_file
 
@@ -125,12 +125,10 @@ def copie(request, tmp_path: Path, _copier_config_file: Path) -> Generator:
         res = copie.copie(extra_context={"project_name": "foo"})
     """
     template_dir = Path(".")
-    output_dir = tmp_path / "copie"
-    output_dir.mkdir()
+    (output_dir := tmp_path / "copie").mkdir()
 
     def output_factory(dirname: str) -> Path:
-        new_dir = output_dir / dirname
-        new_dir.mkdir()
+        (new_dir := output_dir / dirname).mkdir()
         return new_dir
 
     yield Copie(template_dir, output_factory, _copier_config_file)
diff --git a/tests/conftest.py b/tests/conftest.py
index e34791d..d1984c2 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -12,9 +12,7 @@
 @pytest.fixture
 def copier_template(tmpdir) -> Path:
     """Create a default template for the copier project generation."""
-    template_dir = tmpdir / "copie-template"
-    template_dir.mkdir()
-    template_file = template_dir / "copier.yaml"
+    # set up the configuration parameters
     template_config = {
         "repo_name": {"type": "str", "default": "foobar"},
         "short_description": {
@@ -22,18 +20,19 @@ def copier_template(tmpdir) -> Path:
             "default": "Test Project",
         },
     }
-    template_file.write_text(yaml.dump(template_config))
 
+    # content of a fake readme file
     template_readme = [
         r"{{ repo_name }}",
         "{% for _ in repo_name %}={% endfor %}",
         r"{{ short_description }}",
     ]
 
-    repo_dir = template_dir / r"{{ repo_name }}"
-    repo_dir.mkdir()
-    readm_file = repo_dir / "README.rst"
-    readm_file.write_text("\n".join(template_readme))
+    # create all the folders and files
+    (template_dir := tmpdir / "copie-template").mkdir()
+    (template_dir / "copier.yaml").write_text(yaml.dump(template_config))
+    (repo_dir := template_dir / r"{{ repo_name }}").mkdir()
+    (repo_dir / "README.rst").write_text("\n".join(template_readme))
 
     return template_dir