diff --git a/python/pyproject.toml b/python/pyproject.toml
index a445ed3..36eb219 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -40,7 +40,13 @@ Homepage = "https://github.com/eiffel-community/etos-api"
 Repository = "https://github.com/eiffel-community/etos-api"
 
 [project.optional-dependencies]
-testing = ["pytest", "pytest-cov"]
+testing = [
+    "pytest",
+    "pytest-cov",
+    "tox",
+    "pytest-asyncio",
+    "httpx"
+]
 
 [tool.build_sphinx]
 source_dir = "docs"
diff --git a/python/src/etos_api/routers/v0/router.py b/python/src/etos_api/routers/v0/router.py
index 53ed8f0..b80c62e 100644
--- a/python/src/etos_api/routers/v0/router.py
+++ b/python/src/etos_api/routers/v0/router.py
@@ -105,6 +105,7 @@ async def _start(etos: StartEtosRequest, span: Span) -> dict:  # pylint:disable=
     span.set_attribute("etos.id", tercc.meta.event_id)
 
     LOGGER.info("Validating test suite.")
+    span.set_attribute("etos.test_suite.uri", etos.test_suite_url)
     await validate_suite(etos.test_suite_url)
     LOGGER.info("Test suite validated.")
 
diff --git a/python/src/etos_api/routers/v1alpha/router.py b/python/src/etos_api/routers/v1alpha/router.py
index 2570f5e..9c33607 100644
--- a/python/src/etos_api/routers/v1alpha/router.py
+++ b/python/src/etos_api/routers/v1alpha/router.py
@@ -117,6 +117,7 @@ async def _create_testrun(etos: StartTestrunRequest, span: Span) -> dict:
     span.set_attribute("etos.id", testrun_id)
 
     LOGGER.info("Download test suite.")
+    span.set_attribute("etos.test_suite.uri", etos.test_suite_url)
     test_suite = await download_suite(etos.test_suite_url)
     LOGGER.info("Test suite downloaded.")