I do now. Given my test environment, I typically spin up a box of whatever flavor keep everything self contained. Now, I have a windows box with Server, Portal, and two web adaptors, and a Linux box with Tomcat 8.0.32 Server, Portal, and three web adaptors - two pointing at Server/Portal on this box, and the 3rd pointing to ArcGIS Server on Windows.
Keep in mind that 'working' is a relative term, and is not the same as supported. We had to code around some pretty extensive changes in Tomcat in order to support newer versions in 10.6. At 10.6 we've certified Tomcat 7.0.72, 8.0.38, 8.5.6 and 8.5.20. See http://support.esri.com/bugs/nimbus/QlVHLTAwMDEwMjU0NA== for an example.