ImportError: libQtTest.so.4: cannot open shared

错误：

    import cv2
  File "/usr/local/lib/python3.5/dist-packages/cv2/__init__.py", line 3, in <module>
    from .cv2 import *
ImportError: libQtTest.so.4: cannot open shared object file: No such file or directory

解决：

sudo apt install libqt4-test