fix: missing import

Author: mgxd

nipype/pipeline/engine/tests/test_join.py

@@ -627,7 +627,7 @@ def nested_wf(i, name='smallwf'):
         wf.connect(pre_join, 'output1', join, 'n')
         return wf
     # master wf
-    meta_wf = Workflow(name='meta', base_dir='.')
+    meta_wf = pe.Workflow(name='meta', base_dir='.')
     # add each mini-workflow to master
     for i in [[1,3],[2,4]]:
         mini_wf = nested_wf(i)