How to use the ndlib.restutil.postJson function in ndlib

def test_post_project(self):
    project = {
        'project_name' : p.project,
        'host' : 'localhost',
        's3backend' : 0,
        'public' : 1,
        'kvserver' : 'localhost',
        'kvengine' : MYSQL
    }
    response = postJson('https://{}/resource/dataset/{}/project/{}'.format(SITE_HOST, p.dataset, p.project), project)
    assert(response.status_code == 201)

def test_post_channel(self):
    channel = {
        'channel_name' : p.channels[0],
        'channel_type' : p.channel_type,
        'channel_datatype' : p.datatype,
        'startwindow' : 0,
        'endwindow': 500
    }
    response = postJson('https://{}/resource/dataset/{}/project/{}/channel/{}/'.format(SITE_HOST, p.dataset, p.project, p.channels[0]), channel)
    assert(response.status_code == 201)

def test_post_token(self):
    token = {
        'token_name' : p.token,
        'public' : 1
    }
    response = postJson('https://{}/resource/dataset/{}/project/{}/token/{}/'.format(SITE_HOST, p.dataset, p.project, p.token), token)
    assert(response.status_code == 201)

def test_post_dataset(self):
    dataset = {
        'dataset_name' : p.dataset,
        'ximagesize': 2000,
        'yimagesize' : 2000,
        'zimagesize' : 100,
        'xvoxelres' : 1.0,
        'yvoxelres' : 2.0,
        'zvoxelres' : 1.0,
        'public' : 1
    }
    response = postJson('https://{}/resource/dataset/{}/'.format(SITE_HOST, p.dataset), dataset)
    assert(response.status_code == 201)

def create_channel(dataset_name, project_name, channel_name, channel_type, channel_datatype, startwindow, endwindow):
  channel = {
      'channel_name' : channel_name,
      'channel_type' : channel_type,
      'channel_datatype' : channel_datatype,
      'startwindow' : startwindow,
      'endwindow' : endwindow
  }
  response = postJson('http://{}/resource/dataset/{}/project/{}/channel/{}/'.format(SITE_HOST, dataset_name, project_name, channel_name), channel)
  assert(response.status_code == 201)