[redgifs] add test for numeric ID

test/results/redgifs.py

@@ -165,6 +165,14 @@ __tests__ = (
     "#class"   : redgifs.RedgifsImageExtractor,
 },
 
+{
+    "#url"     : "https://v3.redgifs.com/watch/605025947780972895",
+    "#category": ("", "redgifs", "image"),
+    "#class"   : redgifs.RedgifsImageExtractor,
+
+    "id": "humblegrippingmole",
+},
+
 {
     "#url"     : "https://www.gfycat.com/foolishforkedabyssiniancat",
     "#category": ("", "redgifs", "image"),