Init testing

src/main.rs

@@ -3,6 +3,9 @@ extern crate clap;
 
 mod args;
 
+#[cfg(test)]
+mod tests;
+
 fn main() {
     let matches = args::get_matches();
 }

src/tests/args.rs

@@ -0,0 +1,6 @@
+use args;
+
+#[test]
+fn it_works() {
+    assert_eq!(4, 4);
+}

src/tests/mod.rs

@@ -0,0 +1 @@
+pub mod args;