diff --git a/src/main.rs b/src/main.rs
index 4bd8117..23c4de5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,29 +4,62 @@ 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,
-    ]
-};
+fn 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,
-]};
+fn 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,
+        ]
+    }
+}
+
+fn test_sprite() -> Sprite {
+    Sprite {
+        id: "a".to_string(),
+        name: Some("hatch".to_string()),
+        animation_frames: vec![
+            Image {
+                pixels: vec![
+                    0,0,0,0,0,0,0,0,
+                    0,1,1,1,1,0,0,0,
+                    0,1,0,0,1,0,0,0,
+                    0,0,1,1,1,1,0,0,
+                    0,0,1,1,1,1,0,0,
+                    0,1,0,1,1,1,1,0,
+                    0,1,0,1,1,1,1,0,
+                    0,1,1,0,1,1,1,1,
+                ]
+            }
+        ],
+        dialogue: Some("SPR_0".to_string()),
+        position: Position {
+            room: "4".to_string(),
+            x: 9,
+            y: 7
+        }
+    }
+}
 
 #[derive(Debug, Eq, PartialEq)]
 struct Colour {
@@ -178,7 +211,7 @@ fn image_to_string_opts(image: Image, hd: bool) -> String {
 
 #[test]
 fn test_image_to_string() {
-    let output = image_to_string(TEST_IMAGE_CHEQUERS_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);
@@ -266,8 +299,8 @@ fn test_tile_to_string() {
         name: Some("chequers".to_string()),
         wall: false,
         animation_frames: vec![
-            TEST_IMAGE_CHEQUERS_1,
-            TEST_IMAGE_CHEQUERS_2,
+            test_image_chequers_1(),
+            test_image_chequers_2(),
         ]
     });
 
@@ -434,45 +467,30 @@ fn sprite_from_string(string: String) -> Sprite {
 #[test]
 fn test_sprite_from_string() {
     let output = sprite_from_string("SPR a\n00000000\n01111000\n01001000\n00111100\n00111100\n01011110\n01011110\n01101111\nNAME hatch\nDLG SPR_0\nPOS 4 9,7".to_string());
-    let expected = Sprite {
-        id: "a".to_string(),
-        name: Some("hatch".to_string()),
-        animation_frames: vec![
-            Image {
-                pixels: vec![
-                    0,0,0,0,0,0,0,0,
-                    0,1,1,1,1,0,0,0,
-                    0,1,0,0,1,0,0,0,
-                    0,0,1,1,1,1,0,0,
-                    0,0,1,1,1,1,0,0,
-                    0,1,0,1,1,1,1,0,
-                    0,1,0,1,1,1,1,0,
-                    0,1,1,0,1,1,1,1,
-                ]
-            }
-        ],
-        dialogue: Some("SPR_0".to_string()),
-        position: Position {
-            room: "4".to_string(),
-            x: 9,
-            y: 7
-        }
-    };
+    let expected = test_sprite();
     
     assert_eq!(output, expected);
 }
 
 fn sprite_to_string(sprite: Sprite) -> String {
     format!(
-        "SPR {}\n{}\n{}{}\nPOS {}",
+        "SPR {}\n{}{}{}\nPOS {}",
         sprite.id,
         animation_frames_to_string(sprite.animation_frames),
-        if sprite.name.is_some() {format!("NAME {}", sprite.name.unwrap())} else {"".to_string()},
-        if sprite.dialogue.is_some() {format!("DLG {}", sprite.dialogue.unwrap())} else {"".to_string()},
+        if sprite.name.is_some() {format!("\nNAME {}", sprite.name.unwrap())} else {"".to_string()},
+        if sprite.dialogue.is_some() {format!("\nDLG {}", sprite.dialogue.unwrap())} else {"".to_string()},
         position_to_string(sprite.position),
     )
 }
 
+#[test]
+fn test_sprite_to_string() {
+    let output = sprite_to_string(test_sprite());
+    let expected = "SPR a\n00000000\n01111000\n01001000\n00111100\n00111100\n01011110\n01011110\n01101111\nNAME hatch\nDLG SPR_0\nPOS 4 9,7".to_string();
+    
+    assert_eq!(output, expected);
+}
+
 // fn game_from_string(game: String ) -> Game {
 //     // probably needs to split the game data into different segments starting from the end
 //     // e.g. VAR... then END... then DLG...