test(urlbuilder): add more testcases to test urlbuilder with srcset

tests/test_srcset.py

@@ -14,6 +14,7 @@
 DOMAIN = "testing.imgix.net"
 TOKEN = "MYT0KEN"
 JPG_PATH = "image.jpg"
+JPG_PATH_WITH_SPACE = 'image 123.jpg'
 
 
 def extract_descriptors(srcset=""):
@@ -132,6 +133,22 @@ def test_create_srcset_100_to_108():
     assert expected == actual
 
 
+def test_create_srcset_with_widths_and_disable_path_encoding_true():
+    ub = imgix.UrlBuilder(DOMAIN, include_library_param=False, disable_path_encoding=True)
+    actual = ub.create_srcset(JPG_PATH_WITH_SPACE, widths=[100])
+    expected = "https://testing.imgix.net/image 123.jpg?w=100 100w"
+
+    assert(expected == actual)
+
+
+def test_create_srcset_start_equals_stop_with_disable_path_encoding_true():
+    ub = imgix.UrlBuilder(DOMAIN, include_library_param=False, disable_path_encoding=True)
+    actual = ub.create_srcset(JPG_PATH_WITH_SPACE, start=713, stop=713)
+    expected = "https://testing.imgix.net/image 123.jpg?w=713 713w"
+
+    assert(expected == actual)
+
+
 def test_given_width_srcset_is_DPR():
     srcset = _default_srcset({"w": 100})
     device_pixel_ratio = 1