How to use the placebo.Placebo function in placebo

"""Tests for main placebo interface and functionality."""
import json
import unittest
import requests
from placebo import Placebo


class GetMock(Placebo):
    # Test related data that will be used in tests.
    item = {'name': 'Huseyin', 'last_name': 'Yilmaz'}
    item2 = {'name': 'Mert', 'last_name': 'Yilmaz'}
    url2 = 'http://www.example2.com/api/item'
    # Data for placebo interface
    url = 'http://www.example.com/api/item'
    body = json.dumps(item)
    headers = {'content-type': 'application/json',
               'custom-header': 'OK'}


class StringValuesTestCase(unittest.TestCase):

    @GetMock.decorate
    def test_get(self):
        response = requests.get(GetMock.url)

import json
from placebo import Placebo


class GetMovieValidResponse(Placebo):

    # mock related data. That will be used in tests.
    title = 'matrix'
    year = 1999

    url = 'http://www.omdbapi.com/'
    body = json.dumps({
        'Actors': 'Keanu Reeves, Laurence Fishburne, Carrie-Anne Moss, Hugo Weaving',  # noqa
        'Awards': 'Won 4 Oscars. Another 33 wins & 44 nominations.',
        'Country': 'USA',
        'Director': 'Lana Wachowski, Lilly Wachowski',
        'Genre': 'Action, Sci-Fi',
        'Language': 'English',
        'Metascore': '73',
        'Plot': 'A computer hacker learns from mysterious rebels about the true nature of his reality and his role in the war against its controllers.',  # noqa
        'Poster': 'http://ia.media-imdb.com/images/M/MV5BMTkxNDYxOTA4M15BMl5BanBnXkFtZTgwNTk0NzQxMTE@._V1_SX300.jpg',  # noqa

from placebo import Placebo
from placebo.utils.importutils import import_string

httpretty_path = 'placebo.backends.httprettybackend.get_decorator'
httmock_path = 'placebo.backends.httmockbackend.get_decorator'
# Get value from environment.
backend_str = os.environ.get('PLACEBO_BACKEND', httmock_path)
# There are some some unexpected behaviors we get from httpretty
# so some tests must be disabled for httpretty
is_httpretty = (backend_str == httpretty_path)
is_httmock = (backend_str == httmock_path)

backend = import_string(backend_str)


class BasePlacebo(Placebo):
    backend = backend


def remove_common_headers(headers):
    common_headers = ['content-type', 'content-length']
    for header in common_headers:
        if header in headers:
            del headers[header]
    return headers

if not response.ok:
            raise ItemException('List API returned an error')
        else:
            return response.json()

###################
# PLACEBO OBJECTS #
###################


class SimplePlacebo(Placebo):
    url = 'http://www.acme.com/items/'
    body = '[{"id": 1}, {"id": 2}, {"id": 3}]'


class SimplePlaceboWithAllFields(Placebo):
    url = 'http://www.acme.com/items/'
    body = '[{"id": 1}, {"id": 2}, {"id": 3}]'
    status = 200
    method = 'GET'
    headers = {'custom-header': 'custom'}


class DynamicPlacebo(Placebo):

    backend = get_decorator

    url_regex = re.compile('^http://www.acme.com/items/(?P\d+)/$')

    def url(self):
        return parse.ParseResult(
            scheme='http',

class SimplePlacebo(Placebo):
    url = 'http://www.acme.com/items/'
    body = '[{"id": 1}, {"id": 2}, {"id": 3}]'


class SimplePlaceboWithAllFields(Placebo):
    url = 'http://www.acme.com/items/'
    body = '[{"id": 1}, {"id": 2}, {"id": 3}]'
    status = 200
    method = 'GET'
    headers = {'custom-header': 'custom'}


class DynamicPlacebo(Placebo):

    backend = get_decorator

    url_regex = re.compile('^http://www.acme.com/items/(?P\d+)/$')

    def url(self):
        return parse.ParseResult(
            scheme='http',
            netloc=r'www\.acme\.com',
            path=r'^/items/(\w+)/$',
            params='',
            query='',
            fragment='')

    def method(self):
        return 'GET'

return response.json()

    def get_item(self, item_id):
        url = self.item_url % item_id
        response = requests.get(url)
        if not response.ok:
            raise ItemException('List API returned an error')
        else:
            return response.json()

###################
# PLACEBO OBJECTS #
###################


class SimplePlacebo(Placebo):
    url = 'http://www.acme.com/items/'
    body = '[{"id": 1}, {"id": 2}, {"id": 3}]'


class SimplePlaceboWithAllFields(Placebo):
    url = 'http://www.acme.com/items/'
    body = '[{"id": 1}, {"id": 2}, {"id": 3}]'
    status = 200
    method = 'GET'
    headers = {'custom-header': 'custom'}


class DynamicPlacebo(Placebo):

    backend = get_decorator