$ spack -d install --test=all mesa
==> [2020-11-25-06:00:43.245416] Imported install from built-in commands
==> [2020-11-25-06:00:43.247920] Reading config file /home/culpo/PycharmProjects/spack/etc/spack/defaults/config.yaml
==> [2020-11-25-06:00:43.281755] Reading config file /home/culpo/.spack/config.yaml
==> [2020-11-25-06:00:43.284750] Imported install from built-in commands
==> [2020-11-25-06:00:43.290039] Reading config file /home/culpo/PycharmProjects/spack/etc/spack/defaults/repos.yaml
==> [2020-11-25-06:00:44.668260] Reading config file /home/culpo/.spack/linux/compilers.yaml
==> [2020-11-25-06:00:44.813981] Reading config file /home/culpo/PycharmProjects/spack/etc/spack/defaults/packages.yaml
==> [2020-11-25-06:00:44.850561] Reading config file /home/culpo/.spack/packages.yaml
Traceback (most recent call last):
  File "/home/culpo/PycharmProjects/spack/bin/spack", line 66, in <module>
    sys.exit(spack.main.main())
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/main.py", line 762, in main
    return _invoke_command(command, parser, args, unknown)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/main.py", line 490, in _invoke_command
    return_val = command(parser, args)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/cmd/install.py", line 302, in install
    specs = spack.cmd.parse_specs(
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/cmd/__init__.py", line 164, in parse_specs
    spec.concretize(tests=tests)  # implies normalize
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/spec.py", line 2469, in concretize
    self._new_concretize(tests)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/spec.py", line 2445, in _new_concretize
    result = spack.solver.asp.solve([self], tests=tests)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/solver/asp.py", line 1838, in solve
    return driver.solve(setup, specs, dump, models, timers, stats, tests)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/solver/asp.py", line 620, in solve
    solver_setup.setup(self, specs, tests=tests)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/solver/asp.py", line 1484, in setup
    self.pkg_rules(pkg, tests=tests)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/solver/asp.py", line 901, in pkg_rules
    self.package_dependencies_rules(pkg, tests)
  File "/home/culpo/PycharmProjects/spack/lib/spack/spack/solver/asp.py", line 920, in package_dependencies_rules
    if t == 'test' and (not tests or pkg.name not in tests):
TypeError: argument of type 'bool' is not iterable