Pytest's default import mode (prepend/rootdir) imports test modules as
top-level modules keyed by filename. When two directories contain test
files with the same basename (e.g. test_sdkconfig.py in both
test_build_system/ and test_build_system/buildv2/), pytest tries to
register both as the module name "test_sdkconfig". The second collection
fails with "import file mismatch" because the module object already
cached in sys.modules points to the first file.
Adding __init__.py to the buildv2/ directory makes it a proper Python
package. Pytest then imports its test modules under the package
namespace (buildv2.test_sdkconfig), which is distinct from the
top-level test_sdkconfig, resolving the collision.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
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