diff --git a/pyproject.toml b/pyproject.toml
index 2cbc845..69cfbbf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,7 @@ docs = [
 ]
 test = [
     'pytest',
+    'asdf',
 ]
 
 [project.urls]
diff --git a/tests/test_no_resources.py b/tests/test_no_resources.py
new file mode 100644
index 0000000..8fda941
--- /dev/null
+++ b/tests/test_no_resources.py
@@ -0,0 +1,7 @@
+import asdf
+
+
+def test_no_resources():
+    resource_manager = asdf.get_config().resource_manager
+    for uri, mapping in resource_manager._mappings_by_uri.items():
+        assert mapping.package_name != "asdf-unit-schemas"