feat(cli): Add slow test warning

[mmastrac]

By default, uses a 60 second timeout, backing off 2x each time (can be overridden using the hidden DENO_SLOW_TEST_TIMEOUT which we implement only really for spec testing.

Deno.test(async function test() {
  await new Promise(r => setTimeout(r, 130_000));
});

$ target/debug/deno test /tmp/test_slow.ts 
Check file:///tmp/test_slow.ts
running 1 test from ../../../../../../tmp/test_slow.ts
test ...'test' is running very slowly (1m0s)
'test' is running very slowly (2m0s)
 ok (2m10s)

ok | 1 passed | 0 failed (2m10s)

[bartlomieju]

@dsherret does this satisfy the needs you had to debug Node.js compat tests?

[bartlomieju]

LGTM, this is great! Let's wait until v1.44 to merge it.

[Leokuma]

Would it make sense to add a timeout option to Deno.test() and in step()? If the test takes longer than timeout, it fails.

Deno.test({
  timeout: 1_000_000_000, // ns
  name: "example test",
  fn() {
    assertEquals("world", "world")
  }
})

It's already possible to do that manually by measuring the time spent and then throwing, but a timeout option would be so ergonomic it might be worth it.

[bartlomieju]

@Leokuma it's covered by #11133. And yes, this is something we want to add.