test: add results to assertion messages

[kkwoker]

This commit also puts the first two tests in scope.
expected_result was being overwritten in the second test before the first test passes, creating a race condition.

Checklist

• [x ] make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• [ x] commit message follows commit guidelines

Affected core subsystem(s)

[joyeecheung]

CI: https://ci.nodejs.org/job/node-test-pull-request/10428/

[kkwoker]

I duplicated this PR in #16037, and have a better solution for cleaning up the assertion values