deno test log file paths

[timreichen]

As mentioned here:
There is a problem what tests belong to which file/module. std solves that currently with prefixing every test name. Though that works, I think there would be a better solution. deno test should log file paths to differentiate the tests like so for a better overview:

std/datetime/test.ts
  test parse ... ok
  test format ... ok
  …
std/bytes/test.ts
  test findIndex1 ... ok
  test findIndex2 ... ok
  …

[nayeemrmn]

Duplicate of #4644. This requires some kind of isolation between runs on each module instead of just importing them all into the same environment.

[bartlomieju]

CC @caspervonb for looking into this.

Closing as duplicate