Parse srcset attribute

tests/unit/script/htmlimageelement.rs

@@ -4,6 +4,7 @@
 
 use script::test::DOMString;
 use script::test::sizes::{parse_a_sizes_attribute, Size};
+use script::test::srcset::{Descriptor, ImageSource, parse_a_srcset_attribute};
 use style::media_queries::{MediaQuery, MediaQueryType};
 use style::media_queries::Expression;
 use style::servo::media_queries::{ExpressionKind, Range};
@@ -99,3 +100,82 @@ fn extra_whitespace() {
         DOMString::from("(max-width: 900px) 1000px,   (max-width: 900px) 50px"),
         None), a);
 }
+
+#[test]
+fn no_value() {
+    let new_vec = Vec::new();
+    assert_eq!(parse_a_srcset_attribute(" "), new_vec);
+}
+
+#[test]
+fn width_one_value() {
+    let first_descriptor = Descriptor { wid: Some(320), den: None };
+    let first_imagesource = ImageSource { url: "small-image.jpg".to_string(), descriptor: first_descriptor };
+    let sources = &[first_imagesource];
+    assert_eq!(parse_a_srcset_attribute("small-image.jpg, 320w"), sources);
+}
+
+#[test]
+fn width_two_value() {
+    let first_descriptor = Descriptor { wid: Some(320), den: None };
+    let first_imagesource = ImageSource { url: "small-image.jpg".to_string(), descriptor: first_descriptor };
+    let second_descriptor = Descriptor { wid: Some(480), den: None };
+    let second_imagesource = ImageSource { url: "medium-image.jpg".to_string(), descriptor: second_descriptor };
+    let sources = &[first_imagesource, second_imagesource];
+    assert_eq!(parse_a_srcset_attribute("small-image.jpg 320w, medium-image.jpg 480w"), sources);
+}
+
+#[test]
+fn width_three_value() {
+    let first_descriptor = Descriptor { wid: Some(320), den: None };
+    let first_imagesource = ImageSource { url: "smallImage.jpg".to_string(), descriptor: first_descriptor };
+    let second_descriptor = Descriptor { wid: Some(480), den: None };
+    let second_imagesource = ImageSource { url: "mediumImage.jpg".to_string(), descriptor: second_descriptor };
+    let third_descriptor = Descriptor { wid: Some(800), den: None };
+    let third_imagesource = ImageSource { url: "largeImage.jpg".to_string(), descriptor: third_descriptor };
+    let sources = &[first_imagesource, second_imagesource, third_imagesource];
+    assert_eq!(parse_a_srcset_attribute("smallImage.jpg 320w,
+                                        mediumImage.jpg 480w,
+                                        largeImage.jpg 800w"), sources);
+}
+
+#[test]
+fn density_value() {
+    let first_descriptor = Descriptor { wid: None, den: Some(1.0) };
+    let first_imagesource = ImageSource { url: "small-image.jpg".to_string(), descriptor: first_descriptor };
+    let sources = &[first_imagesource];
+    assert_eq!(parse_a_srcset_attribute("small-image.jpg 1x"), sources);
+}
+
+#[test]
+fn without_descriptor() {
+    let first_descriptor = Descriptor { wid: None, den: None };
+    let first_imagesource = ImageSource { url: "small-image.jpg".to_string(), descriptor: first_descriptor };
+    let sources = &[first_imagesource];
+    assert_eq!(parse_a_srcset_attribute("small-image.jpg"), sources);
+}
+
+//Does not parse an ImageSource when both width and density descriptor present
+#[test]
+fn two_descriptor() {
+    let empty_vec = Vec::new();
+    assert_eq!(parse_a_srcset_attribute("small-image.jpg 320w 1.1x"), empty_vec);
+}
+
+#[test]
+fn decimal_descriptor() {
+    let first_descriptor = Descriptor { wid: None, den: Some(2.2) };
+    let first_imagesource = ImageSource { url: "small-image.jpg".to_string(), descriptor: first_descriptor };
+    let sources = &[first_imagesource];
+    assert_eq!(parse_a_srcset_attribute("small-image.jpg 2.2x"), sources);
+}
+
+#[test]
+fn different_descriptor() {
+    let first_descriptor = Descriptor { wid: Some(320), den: None };
+    let first_imagesource = ImageSource { url: "small-image.jpg".to_string(), descriptor: first_descriptor };
+    let second_descriptor = Descriptor { wid: None, den: Some(2.2) };
+    let second_imagesource = ImageSource { url: "medium-image.jpg".to_string(), descriptor: second_descriptor };
+    let sources = &[first_imagesource, second_imagesource];
+    assert_eq!(parse_a_srcset_attribute("small-image.jpg 320w, medium-image.jpg 2.2x"), sources);
+}