feat(urlbuilder): ability to allow less than 5 variable qualities

Author: ashutoshkrris

imgix/urlbuilder.py

@@ -331,6 +331,7 @@ def _build_srcset_DPR(
         variable_qualities = options.get("variable_qualities", {})
         if variable_qualities:
             validate_variable_qualities(variable_qualities)
+            targets = range(1, len(variable_qualities)+1)
 
         qualities = {**DPR_QUALITIES, **variable_qualities}
 

tests/test_srcset.py

@@ -114,6 +114,22 @@ def test_create_srcset_with_variable_qualities():
     assert expected == actual
 
 
+def test_create_srcset_with_less_than_five_variable_qualities():
+    ub = imgix.UrlBuilder(DOMAIN, include_library_param=False)
+    actual = ub.create_srcset(
+        JPG_PATH,
+        {"w": 100},
+        {"variable_qualities": {1: 100, 2: 90, 3: 80}},
+    )
+    expected = (
+        "https://testing.imgix.net/image.jpg?dpr=1&q=100&w=100 1x,\n"
+        + "https://testing.imgix.net/image.jpg?dpr=2&q=90&w=100 2x,\n"
+        + "https://testing.imgix.net/image.jpg?dpr=3&q=80&w=100 3x"
+    )
+
+    assert expected == actual
+
+
 def test_create_srcset_start_equals_stop():
     ub = imgix.UrlBuilder(DOMAIN, include_library_param=False)
     actual = ub.create_srcset(JPG_PATH, start=713, stop=713)