Add go.testOnSave option

[dmage]

This is a very straightforward implementation of the testOnSave feature (#581).

I suppose it would be much better to compile sources only one time if buildOnSave, testOnSave, and coverOnSave are on: go test -c includes everything from go build, cover is obtained from tests.

Also it would be nice to have some sort of progress bar, but I have no idea where it should be placed.

[msftclas]

Hi @dmage, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes. I promise there's no faxing. https://cla.microsoft.com.

TTYL, MSBOT;

[msftgits]

Hi, I am closing and re-opening this PR to bump the CLA bot. Sorry for the inconvenience!

[msftclas]

Hi @dmage, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!
You've already signed the contribution license agreement. Thanks!
We will now validate the agreement and then real humans will evaluate your PR.

TTYL, MSBOT;

[dmage]

As I can see there is no way to use same command and same handler for all three cases (the output of go test -c -cover differs from the output of go test -c/go build). I think it will be better to leave buildOnSave handler as is, later it can be replaced by go-langserver.

[ramya-rao-a]

This is so cool, thanks @dmage!

Just one thing, the messaging on the status item when tests are completed just say OK/FAIL. For someone just taking a look at it, its not clear what exactly is ok or not ok. :)

Instead, something like "Tests Passed/Failed" would be better. I can take care of that.

[dmage]

Thank you, I didn't expect you to merge this without any changes :)

Please take a look at dmage@d4a9ff3

Now I think showHideTestStatus is unnecessary. There is no reason to hide test status when a tab switched. And test status should be invalidated if any file was changed (it may be a fixture, for example).

[ramya-rao-a]

To be honest I wanted to include this feature in the next update which I wanted to release in a day or two. Didn't know if that was enough time for you to respond to any additional refactoring comments. So I thought I'd do it myself :)

Thanks for the update, that is definitely more cleaner. Feel free to send a PR, and I'll get it merged right away :)