tests: create tests for Album endpoint

* (tests): tests for `.album_image()` of `Album`

tests/test_album.py

@@ -2,6 +2,7 @@
 
 from pyimgurapi.endpoints import Album
 from pyimgurapi.utils import DynamicResponseData
+from tests.utils import get_random_imgur_id
 
 
 class TestAlbum:
@@ -46,3 +47,21 @@ def test_create(
         assert description_fixture in urlopen_mock.call_args[0][0].data.decode(
             "utf-8"
         )
+
+    @patch("urllib.request.urlopen")
+    def test_get_album_image(self, urlopen_mock, imgur_image_get_200_response):
+        urlopen_mock.return_value = imgur_image_get_200_response
+        album_id = get_random_imgur_id()
+        image_id = (
+            imgur_image_get_200_response.json().get("data", {}).get("id")
+        )
+
+        album = Album()
+        res = album.album_image(album_id, image_id)
+
+        urlopen_mock.assert_called_once()
+        assert urlopen_mock.call_args[0][0].method == "GET"
+        assert f"album/{album_id}" in urlopen_mock.call_args[0][0].full_url
+        assert f"image/{image_id}" in urlopen_mock.call_args[0][0].full_url
+        assert isinstance(res, DynamicResponseData)
+        assert res.data.id == image_id