For example: https://builder.blender.org/admin/#/builders/36/builds/2113
This build was running the tests, yet the Build Properties don't show that it was running them.
{F10874664, size=full}
---
As contrast, automatic scheduled builds show that info (even though they always run tests): https://builder.blender.org/admin/#/builders/36/builds/2114
{F10874759, size=full}