Xcode 9 - Could not attach to pid for Frameworks unit tests

After opening a bug report to Apple, they suggested me to:

Check if my user is an Admin user. It was the case.
Check if I have "_developer" group, in the output of groups command. it was the case. Use this command: dscacheutil -q group
Check developer mode rights using the command sudo /usr/sbin/DevToolsSecurity -status. The status was unknown for me.
Enable developer mode rights if needed, using the command sudo /usr/sbin/DevToolsSecurity -enable. This solved finally my issue!

If you have Mojave OS then:

1) Open your target scheme

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2) Uncheck this one

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3) Select this scheme while testing this target (ex. Testing "TestApiTarget" - select "TestApiTarget" in schemes on tests).

Its temporary solution from bug report

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