Add unit test to detect the "unwanted draw point"
Add unit test to detect the "unwanted draw point"

vhotspur/dygraphs,reinert/dygraphs,danvk/dygraphs,vhotspur/dygraphs,reinert/dygraphs,vhotspur/dygraphs,vhotspur/dygraphs,danvk/dygraphs,reinert/dygraphs,danvk/dygraphs,vhotspur/dygraphs,danvk/dygraphs,danvk/dygraphs,reinert/dygraphs,reinert/dygraphs