Source code and Unit Test file splitted.

https://doc.rust-lang.org/book/ch11-03-test-organization.html

Author: Gonzalo Diaz

src/lib.rs

@@ -1,14 +1,5 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
 
-#[cfg(test)]
-mod tests {
-    use super::*;
 
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
 }

tests/test_lib.rs

@@ -0,0 +1,12 @@
+use exercises::add;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}