With 244926e deno test is able to discern that output comes the user code and thus potentially capture it.

In #14262 (comment) @lucacasonato suggests that we should capture the output by default (similar to Rust) and disable this capturing if --nocapture flag is present. When @dsherret and I worked on the above commit, we did consider it, but both of us prefer the output is not captured by default, so we just left it as is.

This warrants some discussion and getting feedback from community.