Replace curl by requests

Replace the curl utility by the python requests library to avoid another
host-dependency.

tests/test_nginx.py

@@ -1,7 +1,8 @@
 """This module contains the tests for the nginx container, the image with nginx pre-installed.
 """
 from bci_tester.data import NGINX_CONTAINER
-
+from tenacity import retry, wait_exponential, stop_after_attempt
+import requests
 
 CONTAINER_IMAGES = (NGINX_CONTAINER,)
 
@@ -10,6 +11,13 @@ def test_nginx_welcome_page(auto_container, host):
     """test that the default welcome page is served by the container."""
     host_port = auto_container.forwarded_ports[0].host_port
 
-    assert "Welcome to nginx" in host.check_output(
-        f"curl -sf --retry 5 --retry-connrefused http://localhost:{host_port}/"
+    # Retry 5 times with quadratic backoff delay
+    @retry(
+        wait=wait_exponential(multiplier=1, min=4, max=10),
+        stop=stop_after_attempt(5),
     )
+    def check_reply():
+        resp = requests.get(f"http://localhost:{host_port}/", timeout=30)
+        resp.raise_for_status()
+        if "Welcome to nginx" not in resp.text:
+            raise ValueError("Invalid response")

tox.ini

@@ -11,6 +11,8 @@ deps =
     dataclasses ; python_version < "3.7"
     pytest-rerunfailures
     typing_extensions
+    requests
+    tenacity
     git+https://github.com/dcermak/pytest_container
     doc: Sphinx