`test_devtools_ui` - Test if dash will run when other `before_request` functions has been registered to flask
`test_devtools_ui` - Test if dash will run when other `before_request` functions has been registered to flask

This test validates issue #1624
The root of this issue lies in the devtools ui, and only occurs when the devtools ui has been enabled

plotly/dash,plotly/dash,plotly/dash,plotly/dash,plotly/dash