diff --git a/day12/src/main.rs b/day12/src/main.rs
index e7a11a9..97a91c0 100644
--- a/day12/src/main.rs
+++ b/day12/src/main.rs
@@ -1,3 +1,12 @@
 fn main() {
-    println!("Hello, world!");
+    let file_str = include_str!("input.txt");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn get_test_data() -> &'static str {
+        include_str!("test-input.txt")
+    }
 }