python rostest fails to import python module

edit

Hello,

I'm using ROS kinetic on an ubuntu 16.04 machine and have been trying to use rostest to run unit tests (and hopefully integration tests in the future). I keep running into problems when trying to import the python classes I'm testing.

Following instructions in the rostest wiki, my file structure is currently as follows:

package_name
|— __init__.py
|— src
    |— __init__.py
    |— package_name
        |—__init__.py
        |— node1.py
|— test
    |— __init__.py
    |— test_node1.py
    |— mytests.test
|— CMakeLists.txt
|— package.xml

The (I think) relevant code is the following:

test_node1.py:

import rospy
import unittest
import io
from package_name.src.package_name.node1 import Node1Class

PKG = 'package_name'


class TestNode1Class(unittest.TestCase):
    """Test Node1Class."""


if __name__ == '__main__':
    import rostest
    rostest.rosrun(PKG, 'node1_tests', TestNode1Class)

mytests.test:

<launch>
    <test test-name="node1_tests" pkg="package_name" type="test_node1.py"/>
</launch>

When I run

rostest package_name mytests.test

It fails with the error

ImportError: No module named src.package_name.node1

It does not mention the top level ROS package name, which makes me think that it does find that put then for some reason is not able to go down the package tree?

However, when I move "test_node1.py" up one level, so that it sits in the root of the ROS package everything does run perfectly (at that point it sits at the same level as the "src" package.

I am pretty new to ROS and the rostest documentation is not very extensive. I feel like there is some path setting I may be missing or did not include?

The full traceback for the error is as follows:

... logging to /home/vagrant/.ros/log/rostest-ubuntu-xenial-29567.log
[ROSUNIT] Outputting test results to /home/vagrant/.ros/test_results/package_name/rostest-test_package_name.xml
Traceback (most recent call last):
  File "/home/vagrant/fs_dev/dev_ws/src/package_name/test/test_node1.py", line 11, in <module>
    from package_name.src.package_name.node1 import Node1Class
ImportError: No module named src.package_name.node1
[Testcase: testnode1_tests] ... FAILURE!
FAILURE: test [node1_tests] did not generate test results
  File "/usr/lib/python2.7/unittest/case.py", line 329, in run
    testMethod()
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rostest/runner.py", line 164, in fn
    self.assert_(os.path.isfile(test_file), "test [%s] did not generate test results"%test_name)
  File "/usr/lib/python2.7/unittest/case.py", line 422, in assertTrue
    raise self.failureException(msg)