ModuleNotFoundError when passing tests in two directories with similar layouts

pytest /tmp/component1/tests/integration works.

pytest /tmp/component2/tests/integration works.

pytest /tmp/component1/tests/integration /tmp/component2/tests/integration fails with ModuleNotFoundError for every test module in the component2 directory, eg: ModuleNotFoundError: No module named 'tests.integration.test_xxx'.

Directory layout of each component is like:

component
├── tests
│   └── __init__.py
│   └── integration
│       └── __init__.py
│       └── test_xxx.py
└── src
│   └── main.py
└── setup.py

Start by running the two individual pytest commands and then the combined command against the component1 and component2 layouts described in the issue. Investigate how pytest resolves the tests packages when both integration directories are collected; done means the combined invocation collects and runs test_xxx.py from both components without ModuleNotFoundError.