charts.lines: add tests for 2-point-chunk
charts.lines: add tests for 2-point-chunk

AlexIljin/factor,factor/factor,factor/factor,tgunr/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,bpollack/factor,AlexIljin/factor,factor/factor,factor/factor,factor/factor,AlexIljin/factor,factor/factor,mrjbq7/factor,AlexIljin/factor,mrjbq7/factor,AlexIljin/factor,tgunr/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,mrjbq7/factor,bpollack/factor,mrjbq7/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,bpollack/factor