feat(cli): Add dot test reporter

[bartlomieju]

This commit adds a "dot" reporter to "deno test" subcommand,
that can be activated using "--dot" flag.

It provides a concise output using:

• "." for passing test
• "," for ignored test
• "!" for failing test

User output is silenced and not printed to the console.

In non-TTY environments each result is printed on a separate line.

Demo:

deno_test_dot_reporter_in_5_mins.mov

[bartlomieju]

Note to self: update manual for this and JUnit reporter.

[dsherret]

LGTM. Not too sure about the flag name though.

[dsherret]

Should it be --reporter=dot?

[bartlomieju]

I was thinking that as well, but with --reporter=junit how are we gonna specify the path? Add a separate --junit-path flag?

That is actually very valid in context of adding this configuration to deno.json.

[lucacasonato]

I think you want junit output in parallel to the visual CLI reporter. So I think in that sense, it's not a replacement for the main reporter, but something additional. This would suggest that deno test --reporter=dot --junit-path=./junit.xml should be valid.

[bartlomieju]

That's a reasonable solution. I'll update the PR.

[marvinhagemeister]

+1 on supporting multiple reporters at the same time. Jest allows you to pass the flag multiple times: jest --reporters="default" --reporters="jest-junit"

[bartlomieju]

While pretty+junit and dot+junit make sense, pretty+dot doesn't. So I'm gonna err on what Luca suggested here.

[bartlomieju]

I'm gonna land this PR as is and change how the flags are setup (and add support in config file) in a follow up PR.