just the big file for tests

src/test.rs

@@ -0,0 +1,11 @@
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use main;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}