def test_parse_module_url():
from sasctl.tasks import _parse_module_url
body = RestObj({'createdBy': 'sasdemo',
'creationTimeStamp': '2019-08-26T15:16:42.900Z',
'destinationName': 'maslocal',
'id': '62cae262-7287-412b-8f1d-bd2a12c8b434',
'links': [{'href': '/modelPublish/models/44d526bc-d513-4637-b8a7-72daee4a7730',
'method': 'GET',
'rel': 'up',
'type': 'application/vnd.sas.models.publishing.publish',
'uri': '/modelPublish/models/44d526bc-d513-4637-b8a7-72daee4a7730'},
{'href': '/modelPublish/models/44d526bc-d513-4637-b8a7-72daee4a7730/log',
'method': 'GET',
'rel': 'self',
'type': 'application/json',
'uri': '/modelPublish/models/44d526bc-d513-4637-b8a7-72daee4a7730/log'}],
'log': 'SUCCESS==={"links":[{"method":"GET","rel":"up","href":"/microanalyticScore/jobs","uri":"/microanalyticScore/jobs","type":"application/vnd.sas.collection","itemType":"application/vnd.sas.microanalytic.job"},{"method":"GET","rel":"self","href":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3","uri":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3","type":"application/vnd.sas.microanalytic.job"},{"method":"GET","rel":"source","href":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3/source","uri":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3/source","type":"application/vnd.sas.microanalytic.module.source"},{"method":"GET","rel":"submodules","href":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3/submodules","uri":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3/submodules","type":"application/vnd.sas.collection","itemType":"application/vnd.sas.microanalytic.submodule"},{"method":"DELETE","rel":"delete","href":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3","uri":"/microanalyticScore/jobs/465ecad8-cfd0-4403-ac8a-e49cd248fae3"},{"method":"GET","rel":"module","href":"/microanalyticScore/modules/decisiontree","uri":"/microanalyticScore/modules/decisiontree","type":"application/vnd.sas.microanalytic.module"}],"version":1,"createdBy":"sasdemo","creationTimeStamp":"2019-08-26T15:16:42.857Z","modifiedBy":"sasdemo","modifiedTimeStamp":"2019-08-26T15:16:48.988Z","id":"465ecad8-cfd0-4403-ac8a-e49cd248fae3","moduleId":"decisiontree","state":"completed","errors":[]}',
'modelId': '459aae0d-d64f-4376-94e7-be31911f4bdb',
'modelName': 'DecisionTree',
'modifiedBy': 'sasdemo',
'modifiedTimeStamp': '2019-08-26T15:16:49.315Z',
'publishName': 'Decision Tree',
'version': 1})
msg = body.get('log').lstrip('SUCßCESS===')
assert _parse_module_url(msg) == '/microanalyticScore/modules/decisiontree'
def side_effect(_, link, **kwargs):
assert 'limit=%d' % limit in link
start = int(re.search(r'(?<=start=)[\d]+', link).group())
if start == 10:
return RestObj(items=pages[1])
elif start == 20:
return RestObj(items=pages[2])
else:
return RestObj(items=[])
def test_list_items():
from sasctl.core import _build_crud_funcs, RestObj
list_items, _, _, _ = _build_crud_funcs('/items')
with mock.patch('sasctl.core.request') as request:
request.return_value = RestObj()
resp = list_items()
assert request.call_count == 1
assert [RestObj()] == resp
def test_getitem_no_paging():
items = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'}]
obj = RestObj(items=items, count=len(items))
with mock.patch('sasctl.core.request') as request:
l = PagedList(obj)
for i in range(len(l)):
item = l[i]
assert RestObj(items[i]) == item
# No request should have been made to retrieve additional data.
request.assert_not_called()
def test_len_no_paging():
items = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'}]
obj = RestObj(items=items, count=len(items))
with mock.patch('sasctl.core.request') as request:
l = PagedList(obj)
assert len(l) == 3
for i, o in enumerate(l):
assert RestObj(items[i]) == o
# No request should have been made to retrieve additional data.
request.assert_not_called()
def test_no_paging_required():
"""If "next" link not present, current items should be included."""
items = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'}]
obj = RestObj(items=items, count=len(items))
with mock.patch('sasctl.core.request') as request:
pager = PagedItemIterator(obj)
for i, o in enumerate(pager):
assert RestObj(items[i]) == o
# No request should have been made to retrieve additional data.
request.assert_not_called()
def test_is_iterator():
"""PagedItemIterator should be an iterator itself."""
items = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'}]
obj = RestObj(items=items, count=len(items))
with mock.patch('sasctl.core.request') as request:
pager = PagedItemIterator(obj)
for i in range(len(items)):
o = next(pager)
assert RestObj(items[i]) == o
# No request should have been made to retrieve additional data.
request.assert_not_called()
def test_convert_to_list():
"""Converts correctly to a list."""
items = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'}]
obj = RestObj(items=items, count=len(items))
with mock.patch('sasctl.core.request') as request:
pager = PagedItemIterator(obj)
# Can convert to list
target = [RestObj(i) for i in items]
assert list(pager) == target
# No request should have been made to retrieve additional data.
request.assert_not_called()
def test_bugfix_27():
"""NaN values should be converted to null before being sent to MAS
https://github.com/sassoftware/python-sasctl/issues/27
"""
import io
from sasctl.core import RestObj
from sasctl.services import microanalytic_score as mas
pd = pytest.importorskip('pandas')
df = pd.read_csv(io.StringIO('\n'.join([
u'BAD,LOAN,MORTDUE,VALUE,REASON,JOB,YOJ,DEROG,DELINQ,CLAGE,NINQ,CLNO,DEBTINC',
u'0,1.0,1100.0,25860.0,39025.0,HomeImp,Other,10.5,0.0,0.0,94.36666667,1.0,9.0,',
u'1,1.0,1300.0,70053.0,68400.0,HomeImp,Other,7.0,0.0,2.0,121.8333333,0.0,14.0,'
])))
with mock.patch('sasctl._services.microanalytic_score.MicroAnalyticScore.get_module') as get_module:
get_module.return_value = RestObj({
'name': 'Mock Module',
'id': 'mockmodule'
})
with mock.patch('sasctl._services.microanalytic_score.MicroAnalyticScore.post') as post:
x = df.iloc[0, :]
mas.execute_module_step('module', 'step', **x)
# Ensure we're passing NaN to execute_module_step
assert pd.isna(x['DEBTINC'])
# Make sure the value has been converted to None before being serialized to JSON.
# This ensures that the JSON value will be null.
json = post.call_args[1]['json']
inputs = json['inputs']
debtinc = [i for i in inputs if i['name'] == 'DEBTINC'].pop()
assert debtinc['value'] is None
def test_no_paging_required():
"""If "next" link not present, current items should be included."""
items = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'}]
obj = RestObj(items=items, count=len(items))
with mock.patch('sasctl.core.request') as request:
pager = PageIterator(obj)
# Returned page of items should preserve item order
items = next(pager)
for idx, item in enumerate(items):
assert item.name == RestObj(items[idx]).name
# No request should have been made to retrieve additional data.
request.assert_not_called()
def test_save_performance_project_types():
from sasctl.tasks import update_model_performance
with mock.patch(
'sasctl._services.model_repository.ModelRepository.get_model'
) as model:
with mock.patch(
'sasctl._services.model_repository.ModelRepository.get_project'
) as project:
model.return_value = RestObj(name='fakemodel', projectId=1)
# Function is required
with pytest.raises(ValueError):
project.return_value = {}
update_model_performance(None, None, None)
# Target Level is required
with pytest.raises(ValueError):
project.return_value = {'function': 'Prediction'}
update_model_performance(None, None, None)
# Prediction variable required
with pytest.raises(ValueError):
project.return_value = {
'function': 'Prediction',
'targetLevel': 'Binary'
}
update_model_performance(None, None, None)
def test_paging_inflated_count():
"""Test behavior when server overestimates the number of items available."""
import re
start = 10
limit = 10
# Only defines 20 items to return
pages = [
[{
'name': x
} for x in list('abcdefghi')],
[{
'name': x
} for x in list('klmnopqrs')],
[{
'name': x
} for x in list('uv')],
]
actual_num_items = sum(len(page) for page in pages)
# services (like Files) may overestimate how many items are available.
# Simulate that behavior
num_items = 23
obj = RestObj(items=pages[0],
count=num_items,
links=[{
'rel':
'next',
'href':
'/moaritems?start=%d&limit=%d' % (start, limit)
}])
with mock.patch('sasctl.core.request') as req:
def side_effect(_, link, **kwargs):
assert 'limit=%d' % limit in link
start = int(re.search(r'(?<=start=)[\d]+', link).group())
if start == 10:
return RestObj(items=pages[1])
elif start == 20:
return RestObj(items=pages[2])
else:
return RestObj(items=[])
req.side_effect = side_effect
pager = PagedItemIterator(obj, threads=1)
# Initially, length is estimated based on how many items the server says it has
assert len(pager) == num_items
# Retrieve all of the items
items = [x for x in pager]
assert len(items) == actual_num_items
assert len(pager) == num_items - actual_num_items
def test_paging(paging):
"""Test that correct paging requests are made."""
obj, items, _ = paging
pager = PagedItemIterator(obj)
for i, o in enumerate(pager):
assert RestObj(items[i]) == o
def test_update_item():
from sasctl.core import _build_crud_funcs, RestObj
_, _, update_item, _ = _build_crud_funcs('/widget')
target = RestObj({'name': 'Test Widget', 'id': 12345})
with mock.patch('sasctl.core.request') as request:
request.return_value = target
# ETag should be required
with pytest.raises(ValueError):
resp = update_item(target)
target._headers = {'etag': 'abcd'}
resp = update_item(target)
assert request.call_count == 1
assert ('put', '/widget/12345') == request.call_args[0]
assert target == resp
def test_zip_paging(paging):
"""Check that zip() works correctly with the list."""
obj, items, _ = paging
l = PagedList(obj)
# length of list should equal total # of items
assert len(l) == len(items)
for target, actual in zip(items, l):
assert RestObj(target).name == actual.name
def test_getitem_paging(paging):
"""Check that list can be enumerated."""
obj, items, _ = paging
l = PagedList(obj)
# length of list should equal total # of items
assert len(l) == len(items)
for i, item in enumerate(l):
assert item.name == RestObj(items[i]).name
def test_put_restobj():
from sasctl.core import put, RestObj
url = "/jobDefinitions/definitions/717331fa-f650-4e31-b9e2-6e6d49f66bf9"
obj = RestObj({'_headers': {'etag': 123, 'content-type': 'spam'}})
# Base case
with mock.patch('sasctl.core.request') as req:
put(url, obj)
assert req.called
args = req.call_args[0]
kwargs = req.call_args[1]
assert args == ('put', url)
assert kwargs['json'] == obj
assert kwargs['headers']['If-Match'] == 123
assert kwargs['headers']['Content-Type'] == 'spam'
# Should merge with explicit headers
with mock.patch('sasctl.core.request') as req:
put(url, obj, headers={'encoding': 'spammy'})
assert req.called
args = req.call_args[0]
kwargs = req.call_args[1]
assert args == ('put', url)
assert kwargs['json'] == obj
assert kwargs['headers']['If-Match'] == 123
assert kwargs['headers']['Content-Type'] == 'spam'
assert kwargs['headers']['encoding'] == 'spammy'
# Should not overwrite explicit headers
with mock.patch('sasctl.core.request') as req:
put(url,
obj,
headers={
'Content-Type': 'notspam',
'encoding': 'spammy'
})
assert req.called
args = req.call_args[0]
kwargs = req.call_args[1]
assert args == ('put', url)
assert kwargs['json'] == obj
assert kwargs['headers']['If-Match'] == 123
assert kwargs['headers']['Content-Type'] == 'notspam'
assert kwargs['headers']['encoding'] == 'spammy'
def test_copy(paging):
"""Check that [:] syntax works correctly with the list."""
obj, items, _ = paging
l = PagedList(obj)
# length of list should equal total # of items
assert len(l) == len(items)
target = items[:]
actual = l[:]
assert len(actual) == len(l)
for i, item in enumerate(actual):
assert item.name == RestObj(target[i]).name
def test_paging_required(paging):
"""Requests should be made to retrieve additional pages."""
obj, items, _ = paging
pager = PageIterator(obj)
init_count = pager._start
for i, page in enumerate(pager):
for j, item in enumerate(page):
if i == 0:
item_idx = j
else:
# Account for initial page size not necessarily being same size
# as additional pages
item_idx = init_count + (i-1) * pager._limit + j
target = RestObj(items[item_idx])
assert item.name == target.name
def test_slice_paging(paging):
"""Check that [i:j] syntax works correctly with the list."""
obj, items, _ = paging
l = PagedList(obj)
# length of list should equal total # of items
assert len(l) == len(items)
# Generate pairs of start:stop indexes that intentionally exceed
# the size of the array, and include empty sequences.
starts = range(len(l) + 1)
stops = range(len(l), -1, -1)
for start, stop in zip(starts, stops):
target = items[start:stop]
actual = l[start:stop]
for i, item in enumerate(actual):
assert item.name == RestObj(target[i]).name
def paging(request):
"""Create a RestObj designed to page through a collection of items and the
collection itself.
Returns
-------
RestObj : initial RestObj that can be used to initialize a paging iterator
List[dict] : List of items being used as the "server-side" source
MagicMock : Mock of sasctl.request for performing additional validation
"""
import math
import re
num_items, start, limit = request.param
with mock.patch('sasctl.core.request') as req:
items = [{'name': str(i)} for i in range(num_items)]
obj = RestObj(items=items[:start],
count=len(items),
links=[{'rel': 'next',
'href': '/moaritems?start=%d&limit=%d' % (
start, limit)}])
def side_effect(_, link, **kwargs):
assert 'limit=%d' % limit in link
start = int(re.search(r'(?<=start=)[\d]+', link).group())
return RestObj(items=items[start:start + limit])
req.side_effect = side_effect
yield obj, items[:], req
# Enough requests should have been made to retrieve all the data.
# Additional requests may have been made by workers to non-existent pages.
call_count = (num_items - start) / float(limit)
assert req.call_count >= math.ceil(call_count)
def test_str():
"""Check str formatting of list."""
source_items = [{'name': 'a'}, {'name': 'b'}, {'name': 'c'},
{'name': 'd'}, {'name': 'e'}, {'name': 'f'}]
start = 2
limit = 2
with mock.patch('sasctl.core.request') as req:
obj = RestObj(items=source_items[:2],
count=len(source_items),
links=[{'rel': 'next',
'href': '/moaritems?start=%d&limit=%d' % (
start, limit)}])
def side_effect(_, link, **kwargs):
if 'start=2' in link:
result = source_items[1:1+limit]
elif 'start=4' in link:
result = source_items[3:3+limit]
return RestObj(items=result)
req.side_effect = side_effect
l = PagedList(obj)
for i in range(len(source_items)):
# Force access of each item to ensure it's downloaded
_ = l[i]
if i < len(source_items) - 1:
# Ellipses should indicate unfetched results unless we're
# at the end of the list
assert str(l).endswith(', ... ]')
else:
assert not str(l).endswith(', ... ]')
def test_define_steps_invalid_name():
"""Verify that invalid characters are stripped."""
# Mock module to be returned
# From bug reported by Paata
module = RestObj({
'createdBy':
'paata',
'creationTimeStamp':
'2020-03-02T15:37:57.811Z',
'id':
'petshop_model_xgb_new',
'language':
'ds2',
'links': [{
'href': '/microanalyticScore/modules',
'itemType': 'application/vnd.sas.microanalytic.module',
'method': 'GET',
'rel': 'up',
'type': 'application/vnd.sas.collection',
'uri': '/microanalyticScore/modules'
}, {
'href': '/microanalyticScore/modules/petshop_model_xgb_new',
'method': 'GET',
'rel': 'self',
'type': 'application/vnd.sas.microanalytic.module',
'uri': '/microanalyticScore/modules/petshop_model_xgb_new'
}, {
'href':
'/microanalyticScore/modules/petshop_model_xgb_new/source',
'method':
'GET',
'rel':
'source',
'type':
'application/vnd.sas.microanalytic.module.source',
'uri':
'/microanalyticScore/modules/petshop_model_xgb_new/source'
}, {
'href':
'/microanalyticScore/modules/petshop_model_xgb_new/steps',
'itemType':
'application/vnd.sas.microanalytic.module.step',
'method':
'GET',
'rel':
'steps',
'type':
'application/vnd.sas.collection',
'uri':
'/microanalyticScore/modules/petshop_model_xgb_new/steps'
}, {
'href':
'/microanalyticScore/modules/petshop_model_xgb_new/submodules',
'itemType':
'application/vnd.sas.microanalytic.submodule',
'method':
'GET',
'rel':
'submodules',
'type':
'application/vnd.sas.collection',
'uri':
'/microanalyticScore/modules/petshop_model_xgb_new/submodules'
}, {
'href': '/microanalyticScore/modules/petshop_model_xgb_new',
'method': 'PUT',
'rel': 'update',
'responseType': 'application/vnd.sas.microanalytic.module',
'type': 'application/vnd.sas.microanalytic.module',
'uri': '/microanalyticScore/modules/petshop_model_xgb_new'
}, {
'href': '/microanalyticScore/modules/petshop_model_xgb_new',
'method': 'DELETE',
'rel': 'delete',
'uri': '/microanalyticScore/modules/petshop_model_xgb_new'
}],
'modifiedBy':
'paata',
'modifiedTimeStamp':
'2020-03-02T15:57:10.008Z',
'name':
'"petshop_model_XGB_new"',
'properties': [{
'name':
'sourceURI',
'value':
'http://modelmanager/modelRepository/models/72facedf-8e36-418e-8145-1398686b997a'
}],
'revision':
0,
'scope':
'public',
'stepIds': ['score'],
'version':
2,
'warnings': []
})
# Mock module step with multiple inputs
step2 = RestObj({
"id":
"score",
"inputs": [{
"name": "age",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "b",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "chas",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "crim",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "dis",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "indus",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "lstat",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "nox",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "ptratio",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "rad",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "rm",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "tax",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "zn",
"type": "decimal",
"dim": 0,
"size": 0
}],
"outputs": [{
"name": "em_prediction",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "p_price",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "_warn_",
"type": "string",
"dim": 0,
"size": 4
}]
})
with mock.patch(
'sasctl._services.microanalytic_score.MicroAnalyticScore.get_module'
) as get_module:
with mock.patch(
'sasctl._services.microanalytic_score.MicroAnalyticScore'
'.get_module_step') as get_step:
get_module.return_value = module
get_step.side_effect = [step2]
result = mas.define_steps(None)
for step in get_step.side_effect:
assert hasattr(result, step.id)
def test_define_steps():
# Mock module to be returned
module = RestObj(name='unittestmodule', stepIds=['step1', 'step2'])
# Mock module step with no inputs
step1 = RestObj(id='post')
# Mock module step with multiple inputs
step2 = RestObj({
"id":
"score",
"inputs": [{
"name": "age",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "b",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "chas",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "crim",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "dis",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "indus",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "lstat",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "nox",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "ptratio",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "rad",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "rm",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "tax",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "zn",
"type": "decimal",
"dim": 0,
"size": 0
}],
"outputs": [{
"name": "em_prediction",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "p_price",
"type": "decimal",
"dim": 0,
"size": 0
}, {
"name": "_warn_",
"type": "string",
"dim": 0,
"size": 4
}]
})
with mock.patch(
'sasctl._services.microanalytic_score.MicroAnalyticScore.get_module'
) as get_module:
with mock.patch(
'sasctl._services.microanalytic_score.MicroAnalyticScore'
'.get_module_step') as get_step:
get_module.return_value = module
get_step.side_effect = [step1, step2]
result = mas.define_steps(None)
for step in get_step.side_effect:
assert hasattr(result, step.id)
def test_get_item_inflated_len():
"""Test behavior when server overestimates the number of items available."""
import re
start = 10
limit = 10
# Only defines 20 items to return
pages = [
[{'name': x} for x in list('abcdefghi')],
[{'name': x} for x in list('klmnopqrs')],
[{'name': x} for x in list('uv')],
]
actual_num_items = sum(len(page) for page in pages)
# services (like Files) may overestimate how many items are available.
# Simulate that behavior
num_items = 23
obj = RestObj(items=pages[0],
count=num_items,
links=[{'rel': 'next',
'href': '/moaritems?start=%d&limit=%d' % (start, limit)}])
with mock.patch('sasctl.core.request') as req:
def side_effect(_, link, **kwargs):
assert 'limit=%d' % limit in link
start = int(re.search(r'(?<=start=)[\d]+', link).group())
if start == 10:
return RestObj(items=pages[1])
elif start == 20:
return RestObj(items=pages[2])
else:
return RestObj(items=[])
req.side_effect = side_effect
pager = PagedList(obj, threads=1)
# Initially, length is estimated based on how many items the server says it has available
assert len(pager) == num_items
# Retrieve all of the items
items = [x for x in pager]
# Should have retrieved all of the items
assert len(items) == actual_num_items
# List length should now be updated to indicate the correct number of items
assert len(pager) == actual_num_items
# Recreate the pager
with mock.patch('sasctl.core.request') as req:
def side_effect(_, link, **kwargs):
assert 'limit=%d' % limit in link
start = int(re.search(r'(?<=start=)[\d]+', link).group())
if start == 10:
return RestObj(items=pages[1])
elif start == 20:
return RestObj(items=pages[2])
else:
return RestObj(items=[])
req.side_effect = side_effect
pager = PagedList(obj, threads=1)
# Requesting the last item should work & cause loading of all items
last_item = pager[-1]
# Make sure the last item is correct (even though server inflated item count)
assert last_item == pages[-1][-1]
assert len(pager) == actual_num_items
def side_effect(_, link, **kwargs):
assert 'limit=%d' % limit in link
start = int(re.search(r'(?<=start=)[\d]+', link).group())
return RestObj(items=items[start:start + limit])
def side_effect(_, link, **kwargs):
if 'start=2' in link:
result = source_items[1:1+limit]
elif 'start=4' in link:
result = source_items[3:3+limit]
return RestObj(items=result)