tests don't need test_ prefix

src/colour.rs

@@ -35,7 +35,7 @@ mod test {
     use crate::colour::Colour;
 
     #[test]
-    fn test_colour_from_string() {
+    fn colour_from_string() {
         assert_eq!(
             Colour::from("0,255,0").unwrap(),
             Colour { red: 0, green: 255, blue: 0 }
@@ -43,22 +43,22 @@ mod test {
     }
 
     #[test]
-    fn test_colour_to_string() {
+    fn colour_to_string() {
         assert_eq!(Colour { red: 22, green: 33, blue: 44, }.to_string(), "22,33,44".to_string());
     }
 
     #[test]
-    fn test_colour_missing_value() {
+    fn colour_missing_value() {
         assert!(Colour::from("0,0").is_err());
     }
 
     #[test]
-    fn test_colour_ambiguous_value() {
+    fn colour_ambiguous_value() {
         assert!(Colour::from("0,0,").is_err());
     }
 
     #[test]
-    fn test_colour_extraneous_value() {
+    fn colour_extraneous_value() {
         assert!(Colour::from("0,0,0,0").is_err());
     }
 }