While running command - python manage.py test --settings=todobackend.settings.test from terminal inside virtualenv I get the error ImportError: No module named d

I'm running python 2.7 and Django 1.9.0

Hierarchy

todobackend
    settings
       __init__.py
        base.py
        test.py
manage.py

test.py

from base import *
import os
# Database
# docs.djangoproject.com/en/1.8/ref/settings
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': os.environ.get('MYSQL_DATABASE', 'todobackend'),
        'USER': os.environ.get('MYSQL_USER', 'todo'),
        'PASSWORD': os.environ.get('MYSQL_PASSWORD', 'password'),
        'HOST': os.environ.get('MYSQL_HOST', 'localhost'),
        'PORT': os.environ.get('MYSQL_PORT', '3306')
    }
}

base.py

"""
Django settings for todobackend project.

Generated by 'django-admin startproject' using Django 1.11.20.

For more information on this file, see
docs.djangoproject.com/en/1.11/topics/settings

For the full list of settings and their values, see
docs.djangoproject.com/en/1.11/ref/settings
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See docs.djangoproject.com/en/1.11/howto/deployment/c…

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'YOUR_SECRET_KEY'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'corsheaders',
    'todos'
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'corsheaders.middleware.CorsMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'todobackend.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'todobackend.wsgi.application'


# Database
# docs.djangoproject.com/en/1.11/ref/settings

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}


# Password validation
# docs.djangoproject.com/en/1.11/ref/settings

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# docs.djangoproject.com/en/1.11/topics/i18n

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# docs.djangoproject.com/en/1.11/howto/static-files

STATIC_URL = '/static/'

# CORS Settings
CORS_ORIGIN_ALLOW_ALL = True

manage.py

#!/usr/bin/env python
import os
import sys

if __name__ == "__main__":
    os.environ.setdefault("DJANGO_SETTINGS_MODULE",
                          "todobackend.settings.base")
    try:
        from django.core.management import execute_from_command_line
    except ImportError:
        # The above import may fail for some other reason. Ensure that the
        # issue is really that Django is missing to avoid masking other
        # exceptions on Python 2.
        try:
            import django
        except ImportError:
            raise ImportError(
                "Couldn't import Django. Are you sure it's installed and "
                "available on your PYTHONPATH environment variable? Did you "
                "forget to activate a virtual environment?"
            )
        raise
    execute_from_command_line(sys.argv)