django.db.utils.OperationalError: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

image: python:3.6.1

services:
    - postgres:9.3

variables:
  POSTGRES_DB: project_ci_test
  POSTGRES_USER: postgres
  POSTGRES_PASSWORD: ""

test:
    script:
    - export DATABASE_URL=postgres://postgres:@postgres:5432/project_ci_test
    - apt-get update -qy
    - apt-get install -y python-dev python-pip
    - pip install -r requirements.txt
    - python manage.py makemigrations
    - python manage.py migrate
    - python manage.py test Project

DATABASES = {
    'default': {
        'ENGINE' : 'django.db.backends.postgresql_psycopg2',
        'NAME' : 'project_ci_test',
        'USER' : 'postgres',
        'PASSWORD': '',

    }
}