dds/tests/basics/test_test_only.py

from contextlib import ExitStack
from tests import DDS
from tests.fileutil import set_contents


def test_lib_with_just_test(dds: DDS, scope: ExitStack):
    scope.enter_context(
        set_contents(
            dds.source_root / 'src/foo.test.cpp',
            b'int main() {}',
        ))

    dds.build(tests=True, apps=False, warnings=False)
    assert (dds.build_dir / f'test/foo{dds.exe_suffix}').is_file()