diff --git a/pyproject.toml b/pyproject.toml
index 69a4bfb..dc7994e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,6 +62,7 @@ tests = [
     'selenium',
     'pytest-selenium',
     'black',
+    'nox',
 ]
 
 [tool.pytest.ini_options]
diff --git a/tests/conftest.py b/tests/conftest.py
index 97f95c6..0ca9b66 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -26,6 +26,7 @@ def run_make_commands(request):
     uv venv && \\
     . .venv/bin/activate && \\
     uv pip install -r requirements.txt && \\
+    rm -rf _build && \\
     .venv/bin/sphinx-build -M zundler . _build
 """
 
diff --git a/tests/copy-button/requirements.txt b/tests/copy-button/requirements.txt
index 2276438..364de24 100644
--- a/tests/copy-button/requirements.txt
+++ b/tests/copy-button/requirements.txt
@@ -1,3 +1,3 @@
 sphinx
 sphinx-copybutton
-../..
+-e ../..
diff --git a/tests/mermaid/requirements.txt b/tests/mermaid/requirements.txt
index e33c256..941ee50 100644
--- a/tests/mermaid/requirements.txt
+++ b/tests/mermaid/requirements.txt
@@ -1,3 +1,3 @@
 sphinx
 sphinxcontrib-mermaid
-../..
+-e ../..
diff --git a/tests/multi-page/requirements.txt b/tests/multi-page/requirements.txt
index 9e1dc97..5c18fae 100644
--- a/tests/multi-page/requirements.txt
+++ b/tests/multi-page/requirements.txt
@@ -1,2 +1,2 @@
 sphinx
-../..
+-e ../..