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[bug] Strange CI issue with test packages

See original GitHub issue

I have just encountered a very strange CI issue in our build. The error output is:

14:19:18  hdf5/1.8.21@user/stable: WARN: Forced CMake build type ('Debug') different from the settings build type ('None')
14:19:18  hdf5/1.8.21@user/stable: WARN: Forced CMake build type ('Release') different from the settings build type ('None')
14:19:18  ERROR: Something failed while testing 'hdf5/1.8.21@user/stable' test_package after it was built using the lockfile. Please report this error: 'NoneType' object has no attribute 'name'
14:19:18  Command 'conan create --lockfile conan.lock packages/hdf5/all hdf5/1.8.21@user/stable' has failed

What we do is to build a set of packages that are required when users want to build our apps. Locally, it works just fine. But on the CI, there is no build folder created inside the test_package folder, and the whole behavior seems strange. Also there is obviously no build output.

This is the test_package recipe:

from conans import ConanFile, tools, CMake


class Hdf5TestConan(ConanFile):
    settings = "os", "compiler", "arch"
    generators = "cmake_paths"
    build_requires = "cmake/[>= 3.14.0]@user/stable"
    cmake = {}
    python_requires = "helper/0.0.5@user/stable"

    def build(self):
        if not self.settings.arch == 'armv8':
            for build_type in ["Debug", "Release"]:
                self.cmake[build_type] = CMake(self, build_type=build_type)
                self.cmake[build_type].definitions["CMAKE_TOOLCHAIN_FILE"] = self.python_requires["helper"].module.setup_toolchain_file()
                self.cmake[build_type].configure(build_folder=self.build_folder + "/" + build_type)
                self.cmake[build_type].build()

    def test(self):
        if not self.settings.arch == 'armv8':
            for build_type in ["Debug", "Release"]:
                self.cmake[build_type].test()

All our test_packages are more or less the same and we never had problems there. Only difference now is that we’re passing the lockfile to the conan create command.

I am really at loss, because I cannot reproduce the error locally. Any conan settings that could influence the behavior? Any ideas / thoughts are highly appreciated!