How can I cause a dummy notification in Android 6.0?

Looking for this?

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It turned out that major automation apps can easily do this, at least Tasker (free trial; user guide), MacroDroid and Automate can.

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Note:

• In Tasker, Action to create a notification from a task is available under Alert action category.

  
  
  

  Test run: use the play button in the main window of the task.




• In MacroDroid, the Action is named Display Notification.

  
  
  

  Test run: long press your macro and choose Test Actions.




• In Automate, the block Notification show under Interface category can create notification. For that block, Proceed should be set to When dismissed.

  
  
  

  Test run: press Start in the default window of the flow.



• In each of the the said apps, you need not to assign a trigger at all.

It might become tedious if you're to create the dummy notification multiple times, so I suggest you try an app which can execute an app shortcut with convenience, such as:

• LMT Launcher; or


• a gesture specific app such as GMD Gesture Control and All in one Gestures (both may require root access); or perhaps


• bind the shortcut to a hardware key using
  Xposed Additions (requires root access and compatible Xposed Framework)