Steps to reproduce

$ spack install --test=root py-pyqt4

Error message

After a successful build, the tests fail with:

'Adapter' object has no attribute 'test_imports'

RUN-TESTS: method not implemented [test_imports]

Information on your system

• Spack: 0.21.0.dev0 (8f3a0d4)
• Python: 3.6.8
• Platform: linux-almalinux8-skylake_avx512
• Concretizer: clingo

@alalazo @tldahlgren

If you identify the fix I can add it in #32696

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have searched the issues of this repo and believe this is not a duplicate
• I have run the failing commands in debug mode and reported the output