Comment 3 for bug 1561197

Having horizon in the test-requirements is for the lint and unit tests that run within a tox venv (no devstack). But having this here should not cause devstack issues. By default, https://github.com/openstack-dev/devstack/blob/master/inc/python#L160, devstack installs the test-requirements when installing the packages.

From a recent install from master(newton), was successful for me:

==> default: Installing test-requirements for /opt/stack/neutron-lbaas-dashboard/test-requirements.txt
==> default: ++inc/python:pip_install:163 echo 'Installing test-requirements for /opt/stack/neutron-lbaas-dashboard/test-requirements.txt'
==> default: ++inc/python:pip_install:165 sudo -H http_proxy= https_proxy= no_proxy= PIP_FIND_LINKS= /usr/local/bin/pip2.7 install -c /opt/stack/requirements/upper-constraints.txt -r /opt/stack/neutron-lbaas-dashboard/test-requirements.txt

...

==> default: Collecting horizon from http://tarballs.openstack.org/horizon/horizon-master.tar.gz#egg=horizon (from -r /opt/stack/neutron-lbaas-dashboard/test-requirements.txt (line 7))
==> default: Downloading http://tarballs.openstack.org/horizon/horizon-master.tar.gz (3.7MB)

Please give more info about the issue your seeing, log snippet, environment, localrc, ...