Cobol Control Flow (CCF) works for SUT programs but not for Unit Test cases.
VS Code
The UT uses ENTRY. CCF creates the flow map based on the PERFORM statements, and because most of the Unit tests (UT) start with ENTRYs before any PERFORMs, CCF can't create a flow map.
There are a few sample UTs with PERFORMs listed before the first ENTRY is encountered, like ZTTDB2PH. These will produce a CCF map.
A workaround is to change all the ENTRY statements to PERFORM paragraphs that have the corresponding ENTRY statement. This will allow CCF to create the map.