Add color serialization unit tests.

Author: jdm

src/tests.rs

@@ -275,6 +275,27 @@ fn serializer() {
 }
 
 
+#[test]
+fn serialize_current_color() {
+    let c = CurrentColor;
+    assert!(format!("{}", c).as_slice() == "currentColor");
+}
+
+
+#[test]
+fn serialize_rgb_full_alpha() {
+    let c = RGBAColor(RGBA { red: 1.0, green: 0.9, blue: 0.8, alpha: 1.0 });
+    assert!(format!("{}", c).as_slice() == "rgb(255, 230, 204)");
+}
+
+
+#[test]
+fn serialize_rgba() {
+    let c = RGBAColor(RGBA { red: 0.1, green: 0.2, blue: 0.3, alpha: 0.5 });
+    assert!(format!("{}", c).as_slice() == "rgba(26, 51, 77, 0.5)");
+}
+
+
 impl ToJson for Result<Rule, SyntaxError> {
     fn to_json(&self) -> json::Json {
         match *self {