diff --git a/tests/unit/utils.py b/tests/unit/utils.py
deleted file mode 100644
index e64b4917..00000000
--- a/tests/unit/utils.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from dbt.adapters.factory import FACTORY
-
-
-def inject_adapter(adapter, plugin):
-    """
-    Inject the given adapter into the factory
-    so that it will be available from get_adapter() as if dbt loaded it.
-    """
-    plugin_key = plugin.adapter.type()
-    FACTORY.plugins[plugin_key] = plugin
-
-    adapter_key = adapter.type()
-    FACTORY.adapters[adapter_key] = adapter