diff --git a/resource_classes/azure/databases.py b/resource_classes/azure/databases.py
index e8e50a3..eae93ef 100644
--- a/resource_classes/azure/databases.py
+++ b/resource_classes/azure/databases.py
@@ -3,7 +3,7 @@
 
 class _Databases(_Azure):
     _type = "databases"
-    _icon_dir = "resource_images/azure/database"
+    _icon_dir = "resource_images/azure/databases"
 
 
 class AzureCosmosDb(_Databases):
diff --git a/tests/test_azure_icon_dirs.py b/tests/test_azure_icon_dirs.py
new file mode 100644
index 0000000..c600a56
--- /dev/null
+++ b/tests/test_azure_icon_dirs.py
@@ -0,0 +1,49 @@
+"""
+Regression tests that every Azure resource class points at an icon that exists.
+
+``resource_classes/azure/databases.py`` declared ``resource_images/azure/database``
+while its icons ship under ``resource_images/azure/databases``, so 41 of its 45
+classes resolved to a missing file. Nothing warned about it: the alias resolved,
+so the renderer believed it had an icon and drew an empty node.
+
+``modules.drawing`` loads every module in the package into one namespace, so the
+alphabetically last module wins. That made ``databases.py`` override the working
+aliases in ``database.py``, and broke azurerm_redis_cache and
+azurerm_postgresql_flexible_server for anyone using them.
+"""
+
+import importlib
+import inspect
+import pkgutil
+from pathlib import Path
+
+import pytest
+
+import resource_classes.azure as azure_classes
+
+REPO_ROOT = Path(azure_classes.__file__).parents[2]
+
+
+def _icon_classes():
+    """Every class in resource_classes.azure that declares an icon."""
+    found = []
+    package_path = Path(azure_classes.__file__).parent
+    for _, module_name, _ in pkgutil.iter_modules([str(package_path)]):
+        module = importlib.import_module(f"resource_classes.azure.{module_name}")
+        for name, obj in vars(module).items():
+            if inspect.isclass(obj) and getattr(obj, "_icon", None):
+                found.append(pytest.param(obj, id=f"{module_name}.{name}"))
+    return found
+
+
+ICON_CLASSES = _icon_classes()
+
+
+def test_azure_icon_classes_were_discovered():
+    assert ICON_CLASSES, "no icon classes found; the package layout changed"
+
+
+@pytest.mark.parametrize("icon_class", ICON_CLASSES)
+def test_icon_file_exists(icon_class):
+    icon = REPO_ROOT / icon_class._icon_dir / icon_class._icon
+    assert icon.is_file(), f"{icon_class.__name__} points at missing icon {icon}"