Refactor _trigger method tests [skip ci]
Refactor _trigger method tests [skip ci]

ericmjl/bokeh,stonebig/bokeh,ericmjl/bokeh,bokeh/bokeh,ericmjl/bokeh,timsnyder/bokeh,Karel-van-de-Plassche/bokeh,timsnyder/bokeh,philippjfr/bokeh,jakirkham/bokeh,jakirkham/bokeh,schoolie/bokeh,philippjfr/bokeh,schoolie/bokeh,rs2/bokeh,DuCorey/bokeh,percyfal/bokeh,Karel-van-de-Plassche/bokeh,aavanian/bokeh,aavanian/bokeh,ericmjl/bokeh,percyfal/bokeh,aavanian/bokeh,stonebig/bokeh,jakirkham/bokeh,stonebig/bokeh,Karel-van-de-Plassche/bokeh,DuCorey/bokeh,DuCorey/bokeh,timsnyder/bokeh,rs2/bokeh,stonebig/bokeh,jakirkham/bokeh,schoolie/bokeh,mindriot101/bokeh,philippjfr/bokeh,DuCorey/bokeh,bokeh/bokeh,percyfal/bokeh,percyfal/bokeh,bokeh/bokeh,dennisobrien/bokeh,mindriot101/bokeh,mindriot101/bokeh,dennisobrien/bokeh,rs2/bokeh,aavanian/bokeh,mindriot101/bokeh,aavanian/bokeh,Karel-van-de-Plassche/bokeh,bokeh/bokeh,dennisobrien/bokeh,philippjfr/bokeh,bokeh/bokeh,dennisobrien/bokeh,percyfal/bokeh,Karel-van-de-Plassche/bokeh,rs2/bokeh,rs2/bokeh,schoolie/bokeh,ericmjl/bokeh,jakirkham/bokeh,timsnyder/bokeh,schoolie/bokeh,philippjfr/bokeh,DuCorey/bokeh,dennisobrien/bokeh,timsnyder/bokeh