fix(test): minor issue with invalid username

Author: skyme5

tests/mock_data/api-error.html

@@ -12,37 +12,37 @@
                 "id": "1PgHW1XZSgWteDhyTiIFbgAAgcnlmYnB0ZWpiAXxms2FCAXxms17GAAAAAA",
                 "media": {
                     "type": "VIDEO",
-                    "mediaUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4",
-                    "mediaStreamingUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4",
-                    "mediaPreviewUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4"
+                    "mediaUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4",
+                    "mediaStreamingUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4",
+                    "mediaPreviewUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4"
                 },
                 "overlayImage": {
-                    "mediaUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4",
-                    "mediaStreamingUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4"
+                    "mediaUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4",
+                    "mediaStreamingUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4"
                 },
                 "captureTimeSecs": "1633810603"
             },
             {
                 "id": "1PgHW1XZSgWteDhyTiIFbgAAgZWZqZ2t2ZGN4AXxpJwZoAXxpJwRfAAAAAA",
                 "media": {
                     "type": "IMAGE",
-                    "mediaUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4"
+                    "mediaUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4"
                 },
                 "captureTimeSecs": "1633851737"
             },
             {
                 "id": "1PgHW1XZSgWteDhyTiIFbgAAgdGlyeXpodGx4AXxpR4jsAXxpR4XzAAAAAA",
                 "media": {
                     "type": "IMAGE",
-                    "mediaUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4"
+                    "mediaUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4"
                 },
                 "captureTimeSecs": "1633853867"
             },
             {
                 "id": "1PgHW1XZSgWteDhyTiIFbgAAgdnJlc2hjeWd5AXxqhQjjAXxqhQaeAAAAAA",
                 "media": {
                     "type": "IMAGE",
-                    "mediaUrl": "https://filesamples.com/samples/video/mp4/sample_640x360.mp4"
+                    "mediaUrl": "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4"
                 },
                 "captureTimeSecs": "1633874675"
             }

tests/mock_data/invalidusername.html

@@ -1,4 +1,5 @@
 """Tests for `snapchat_dl` package."""
+
 import os
 import shutil
 import unittest
@@ -17,7 +18,9 @@ class Test_downloader(unittest.TestCase):
 
     def setUp(self):
         """Set up test fixtures."""
-        self.test_url = "https://filesamples.com/samples/video/mp4/sample_640x360.mp4"
+        self.test_url = (
+            "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4"
+        )
         self.test_url404 = "https://google.com/error.html"
 
     def test_download_url(self):

tests/mock_data/invalidusername.json

@@ -27,7 +27,9 @@ def setUp(self):
             directory_prefix=".test-data",
             dump_json=True,
         )
-        self.test_url = "https://filesamples.com/samples/video/mp4/sample_640x360.mp4"
+        self.test_url = (
+            "https://sample-videos.com/video321/mp4/240/big_buck_bunny_240p_1mb.mp4"
+        )
         self.test_url404 = "https://google.com/error.html"
         self.username = "invalidusername"
         self.html = open(