unit test cases

tests/unit/script/lib.rs

@@ -62,6 +62,30 @@ fn some_parse_sizes_2_test() {
     }
     }
 }
+
+#[test]
+fn some_parse_sizes_3_test() {
+    let mut result = parse_a_sizes_attribute(DOMString::from("(min-width: 900px) 1000px,
+            (max-width: 900px) and (min-width: 400px) 50em,
+            100vw     "),
+            None);
+    let mut component = result.pop();
+    let mut component_secondlast = result.pop();
+    if component_secondlast.is_some() {
+      let component_query = component_secondlast.unwrap().query;
+          if component_query.is_some() {
+                let component_query_expr = component_query.unwrap().expressions;
+                match component_query_expr[0] {
+                   Expression::Width(Range::Max(w)) => assert!(w == specified::Length::Absolute(Au::from_px(900))),
+            _ => panic!("wrong expression type"),
+            }
+                match component_query_expr[1] {
+            Expression::Width(Range::Min(w)) => assert!(w == specified::Length::Absolute(Au::from_px(400))),
+            _ => panic!("wrong expression type"),
+        }
+    }
+    }
+}
 extern crate msg;
 extern crate script;
 extern crate url;