diff --git a/src/main.rs b/src/main.rs
index 39d2f9a..4bd8117 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,30 @@ use std::collections::HashMap;
 const IMAGE_DIMENSION_SD: usize = 8;
 const IMAGE_DIMENSION_HD: usize = 16;
 
+const TEST_IMAGE_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,
+        0,1,0,1,0,1,0,1,
+        1,0,1,0,1,0,1,0,
+        0,1,0,1,0,1,0,1,
+        1,0,1,0,1,0,1,0,
+        0,1,0,1,0,1,0,1,
+    ]
+};
+
+const TEST_IMAGE_CHEQUERS_2: Image = Image { pixels: vec![
+    0,1,0,1,0,1,0,1,
+    1,0,1,0,1,0,1,0,
+    0,1,0,1,0,1,0,1,
+    1,0,1,0,1,0,1,0,
+    0,1,0,1,0,1,0,1,
+    1,0,1,0,1,0,1,0,
+    0,1,0,1,0,1,0,1,
+    1,0,1,0,1,0,1,0,
+]};
+
 #[derive(Debug, Eq, PartialEq)]
 struct Colour {
     red:   u8,
@@ -154,19 +178,7 @@ fn image_to_string_opts(image: Image, hd: bool) -> String {
 
 #[test]
 fn test_image_to_string() {
-    let output = image_to_string(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,
-            0,1,0,1,0,1,0,1,
-            1,0,1,0,1,0,1,0,
-            0,1,0,1,0,1,0,1,
-            1,0,1,0,1,0,1,0,
-            0,1,0,1,0,1,0,1,
-        ]
-    });
-
+    let output = image_to_string(TEST_IMAGE_CHEQUERS_1);
     let expected = "10101010\n01010101\n10101010\n01010101\n10101010\n01010101\n10101010\n01010101".to_string();
 
     assert_eq!(output, expected);
@@ -254,26 +266,8 @@ fn test_tile_to_string() {
         name: Some("chequers".to_string()),
         wall: false,
         animation_frames: vec![
-            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,
-                0,1,0,1,0,1,0,1,
-                1,0,1,0,1,0,1,0,
-                0,1,0,1,0,1,0,1,
-                1,0,1,0,1,0,1,0,
-                0,1,0,1,0,1,0,1,
-            ]},
-            Image { pixels: vec![
-                0,1,0,1,0,1,0,1,
-                1,0,1,0,1,0,1,0,
-                0,1,0,1,0,1,0,1,
-                1,0,1,0,1,0,1,0,
-                0,1,0,1,0,1,0,1,
-                1,0,1,0,1,0,1,0,
-                0,1,0,1,0,1,0,1,
-                1,0,1,0,1,0,1,0,
-            ]},
+            TEST_IMAGE_CHEQUERS_1,
+            TEST_IMAGE_CHEQUERS_2,
         ]
     });