style: use rgb in tests

Author: vil02

src/conversions/rgb_cmyk_conversion.rs

@@ -42,19 +42,19 @@ mod tests {
             $(
                 #[test]
                 fn $name() {
-                    let (r, g, b, cmyk) = $tc;
-                    assert_eq!(rgb_to_cmyk((r, g, b)), cmyk);
+                    let (rgb, cmyk) = $tc;
+                    assert_eq!(rgb_to_cmyk(rgb), cmyk);
                 }
             )*
         }
     }
 
     test_rgb_to_cmyk! {
-        white: (255, 255, 255, (0, 0, 0, 0)),
-        gray: (128, 128, 128, (0, 0, 0, 49)),
-        black: (0, 0, 0, (0, 0, 0, 100)),
-        red: (255, 0, 0, (0, 100, 100, 0)),
-        green: (0, 255, 0, (100, 0, 100, 0)),
-        blue: (0, 0, 255, (100, 100, 0, 0)),
+        white: ((255, 255, 255), (0, 0, 0, 0)),
+        gray: ((128, 128, 128), (0, 0, 0, 49)),
+        black: ((0, 0, 0), (0, 0, 0, 100)),
+        red: ((255, 0, 0), (0, 100, 100, 0)),
+        green: ((0, 255, 0), (100, 0, 100, 0)),
+        blue: ((0, 0, 255), (100, 100, 0, 0)),
     }
 }