diff --git a/2019/day1/src/main.rs b/2019/day1/src/main.rs
index 42153da..cc698de 100644
--- a/2019/day1/src/main.rs
+++ b/2019/day1/src/main.rs
@@ -19,25 +19,30 @@ fn main() {
 
     //all_modules.map(fuel_calc).sum()
     //all_modules.map(fuel_calc).sum()
-    println!("Part2: I need {} fuel for all modules", all_modules.iter().fold(0, |sum, x | fuel_calc_with_fuel(*x) + sum ));
+    println!("Part2: I need {} fuel for all modules", all_modules.iter().fold(0, |sum, x | fuel_tyranny(*x) + sum ));
 }
 
 fn fuel_calc(mass: i32) -> i32 {
     mass / 3 - 2
 }
 
-fn fuel_calc_with_fuel(mass: i32) -> i32 {
+fn fuel_tyranny(mass: i32) -> i32 {
     let fuel = fuel_calc(mass);
     if fuel <= 0 {
         return 0;
     }
-    fuel+fuel_calc_with_fuel(fuel)
+    fuel+fuel_tyranny(fuel)
 }
 
-#[test]
-fn test_it() {
-    assert_eq!(fuel_calc(12), 2);
-    assert_eq!(fuel_calc(14), 2);
-    assert_eq!(fuel_calc(1969), 654);
-    assert_eq!(fuel_calc(100756), 33583);
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_it() {
+        assert_eq!(fuel_calc(12), 2);
+        assert_eq!(fuel_calc(14), 2);
+        assert_eq!(fuel_calc(1969), 654);
+        assert_eq!(fuel_calc(100756), 33583);
+    }
 }