1 files changed, 11 insertions, 0 deletions
diff --git a/rust-book/add/add-one/src/lib.rs b/rust-book/add/add-one/src/lib.rs
new file mode 100755
index 0000000..fe3583e
--- /dev/null
+++ b/rust-book/add/add-one/src/lib.rs
@@ -0,0 +1,11 @@
+pub fn add_one(x: i32) -> i32 {
+    x + 1 
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}