Moved pagination and settings tests to tests module (#1110)

Those were already in pytest style and only needed some simplifications.

tests/test_pagination.py

@@ -0,0 +1,55 @@
+from collections import OrderedDict
+
+from rest_framework.request import Request
+
+from rest_framework_json_api.pagination import JsonApiLimitOffsetPagination
+
+
+class TestLimitOffsetPagination:
+    def test_get_paginated_response(self, rf):
+        pagination = JsonApiLimitOffsetPagination()
+        queryset = range(1, 101)
+        offset = 10
+        limit = 5
+        count = len(queryset)
+
+        request = Request(
+            rf.get(
+                "/",
+                {
+                    pagination.limit_query_param: limit,
+                    pagination.offset_query_param: offset,
+                },
+            )
+        )
+        queryset = list(pagination.paginate_queryset(queryset, request))
+        content = pagination.get_paginated_response(queryset).data
+
+        expected_content = {
+            "results": list(range(11, 16)),
+            "links": OrderedDict(
+                [
+                    ("first", "http://testserver/?page%5Blimit%5D=5"),
+                    (
+                        "last",
+                        "http://testserver/?page%5Blimit%5D=5&page%5Boffset%5D=100",
+                    ),
+                    (
+                        "next",
+                        "http://testserver/?page%5Blimit%5D=5&page%5Boffset%5D=15",
+                    ),
+                    ("prev", "http://testserver/?page%5Blimit%5D=5&page%5Boffset%5D=5"),
+                ]
+            ),
+            "meta": {
+                "pagination": OrderedDict(
+                    [
+                        ("count", count),
+                        ("limit", limit),
+                        ("offset", offset),
+                    ]
+                )
+            },
+        }
+
+        assert content == expected_content