diff --git a/src/mock.rs b/src/mock.rs
index e12770e..9f81b64 100644
--- a/src/mock.rs
+++ b/src/mock.rs
@@ -5,7 +5,7 @@ pub mod image {
     use crate::Image;
 
     #[inline]
-    pub(crate) fn chequers_1() -> Image {
+    pub fn chequers_1() -> Image {
         Image {
             pixels: vec![
                 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1,