diff --git a/requirements-swh.txt b/requirements-swh.txt
--- a/requirements-swh.txt
+++ b/requirements-swh.txt
@@ -1,2 +1,2 @@
 # Add here internal Software Heritage dependencies, one per line.
-swh.core >= 0.3
+swh.core[http] >= 0.3  # [http] is required by swh.core.pytest_plugin
diff --git a/swh/foo/cli.py b/swh/foo/cli.py
--- a/swh/foo/cli.py
+++ b/swh/foo/cli.py
@@ -4,7 +4,7 @@
 from swh.core.cli import swh as swh_cli_group
 
 
-@swh_cli_group(name="foo", context_settings=CONTEXT_SETTINGS)
+@swh_cli_group.group(name="foo", context_settings=CONTEXT_SETTINGS)
 @click.pass_context
 def foo_cli_group(ctx):
     """Foo main command.
diff --git a/swh/foo/tests/test_nothing.py b/swh/foo/tests/test_nothing.py
new file mode 100644
--- /dev/null
+++ b/swh/foo/tests/test_nothing.py
@@ -0,0 +1,3 @@
+def test_nothing():
+    # Placeholder; remove this when we add actual tests
+    pass