Comment 1 for bug 1477345

actually the issue is fixed now .
i set "default_floating_pool = public" under [default] section in nova.conf , restarted nova-api and the tests are passing now.

Slowest 7 tests took 50.82 secs:
tempest.api.compute.floating_ips.test_floating_ips_actions.FloatingIPsTestJSON
    test_allocate_floating_ip[id-f7bfb946-297e-41b8-9e8c-aba8e9bb5194,network] 9.94
    test_associate_already_associated_floating_ip[id-6edef4b2-aaf1-4abc-bbe3-993e2561e0fe,network] 22.37
    test_associate_disassociate_floating_ip[id-307efa27-dc6f-48a0-8cd2-162ce3ef0b52,network] 7.58
    test_delete_floating_ip[id-de45e989-b5ca-4a9b-916b-04a52e7bbb8b,network] 2.93
tempest.api.compute.floating_ips.test_floating_ips_actions_negative.FloatingIPsNegativeTestJSON
    test_allocate_floating_ip_from_nonexistent_pool[id-6e0f059b-e4dd-48fb-8207-06e3bba5b074,negative,network] 2.49
    test_associate_ip_to_server_without_passing_floating_ip[id-804b4fcb-bbf5-412f-925d-896672b61eb3,negative,network] 2.91
    test_delete_nonexistent_floating_ip[id-ae1c55a8-552b-44d4-bfb6-2a115a15d0ba,negative,network] 2.60

Ran 9 tests in 164.357s

OK