Extension attributes and api functional testing

When running api functional tests on a module which uses non-scalar array extension attribute type, I’ve got the error

ReflectionException: Class "ModuleNameCustomerApiCustomAddressInterface[]" does not exist

the attribute is declared as:

<extension_attributes for="MagentoCompanyApiDataCompanyInterface">
        <attribute code="custom_addresses" type="ModuleNameCustomerApiCustomAddressInterface[]" />
</extension_attributes>

The module works perfectly outside the testing framework

I run the tests as:

vendor/bin/phpunit -c $(pwd)/dev/tests/api-functional/phpunit_rest.xml --testsuite testsuite