f742f327a7
Using a smaller viewport speeds up both tests, and lets us know what dimensions to expect in TestCaptureScreenshot. For TestScreenshot, we can know what dimensions to expect in advance, as we have the images in testdata. 'go test -run Screenshot' goes from ~0.9s to ~0.5s on my machine. Finally, don't run ExampleTitle as part of 'go test', as it's slow.
About chromedp 
Package chromedp is a faster, simpler way to drive browsers supporting the Chrome DevTools Protocol in Go using the without external dependencies (ie, Selenium, PhantomJS, etc).
Installing
Install in the usual Go way:
go get -u github.com/chromedp/chromedp
Examples
Please see the examples project for more examples. Please refer to the GoDoc API listing for a summary of the API and Actions.
Resources
- chromedp: A New Way to Drive the Web - GopherCon SG 2017 talk
- Chrome DevTools Protocol - Chrome DevTools Protocol Domain documentation
- chromedp examples - various
chromedpexamples github.com/chromedp/cdproto- GoDoc listing for the CDP domains used bychromedpgithub.com/chromedp/cdproto-gen- tool used to generatecdprotogithub.com/chromedp/chromedp-proxy- a simple CDP proxy for logging CDP clients and browsers
TODO
- Move timeouts to context (defaults)
- Implement more query selector options (allow over riding context timeouts)
- Contextual actions for "dry run" (or via an accumulator?)
- Network loader / manager
- Profiler