diff --git a/pyproject.toml b/pyproject.toml
index 9b07d42..0e552cf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,6 +113,9 @@ mkdocs-jupyter = "^0.24.1"
 [tool.poetry.group.docs]
 optional = true
 
+[tool.poetry.group.unit_tests.dependencies]
+pytest-sugar = "^1.0.0"
+
 [build-system]
 requires = ["poetry-core>=1.0.0", "setuptools", "wheel"]
 build-backend = "poetry.core.masonry.api"