Test cases for parse srcset attribute

components/script/test.rs

@@ -58,3 +58,7 @@ pub mod size_of {
         size_of::<Text>()
     }
 }
+
+pub mod srcset {
+    pub use dom::htmlimageelement::{parse_a_srcset_attribute, ImageSource, Descriptor};
+}

tests/unit/script/htmlimageelement.rs

@@ -0,0 +1,84 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use script::test::srcset::{Descriptor, ImageSource, parse_a_srcset_attribute};
+
+#[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);
+}