add test for link headers. this adds requests-mock as a dependency

Pipfile

@@ -13,3 +13,4 @@ pytest-cov = "*"
 vcrpy = "*"
 pytest-vcr = "<1"
 pytest-mock = "*"
+requests-mock = "*"

Pipfile.lock

@@ -313,6 +313,14 @@
             ],
             "version": "==2.20.1"
         },
+        "requests-mock": {
+            "hashes": [
+                "sha256:7a5fa99db5e3a2a961b6f20ed40ee6baeff73503cf0a553cc4d679409e6170fb",
+                "sha256:8ca0628dc66d3f212878932fd741b02aa197ad53fd2228164800a169a4a826af"
+            ],
+            "index": "pypi",
+            "version": "==1.5.2"
+        },
         "six": {
             "hashes": [
                 "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",

tests/test_pagination.py

@@ -1,5 +1,10 @@
 import pytest
 from contextlib import contextmanager
+try:
+    from mock import MagicMock
+except ImportError:
+    from unittest.mock import MagicMock
+import requests_mock
 
 UNLIKELY_HASHTAG = "fgiztsshwiaqqiztpmmjbtvmescsculuvmgjgopwoeidbcrixp"
 
@@ -44,3 +49,18 @@ def test_fetch_remaining(api):
         hashtag_remaining = api.fetch_remaining(hashtag)
         assert hashtag_remaining
         assert len(hashtag_remaining) >= 30
+
+def test_link_headers(api):
+    rmock = requests_mock.Adapter()
+    api.session.mount(api.api_base_url, rmock)
+
+    _id='abc1234'
+
+    rmock.register_uri('GET', requests_mock.ANY, json=[{"foo": "bar"}], headers={"link":"""
+            <{base}/api/v1/timelines/tag/{tag}?max_id={_id}>; rel="next", <{base}/api/v1/timelines/tag/{tag}?since_id={_id}>; rel="prev"
+        """.format(base=api.api_base_url, tag=UNLIKELY_HASHTAG, _id=_id).strip()
+    })
+
+    resp = api.timeline_hashtag(UNLIKELY_HASHTAG)
+    assert resp[0]._pagination_next['max_id'] == _id
+    assert resp[0]._pagination_prev['since_id'] == _id