add jasmine tests for hover on period positions
add jasmine tests for hover on period positions

plotly/plotly.js,plotly/plotly.js,etpinard/plotly.js,etpinard/plotly.js,aburato/plotly.js,etpinard/plotly.js,plotly/plotly.js,aburato/plotly.js,plotly/plotly.js