added test for basic functions

Cargo.toml

@@ -9,3 +9,6 @@ homepape = "https://github.com/Nirusu99/ytd-rs"
 repository = "https://github.com/Nirusu99/ytd-rs"
 readme = "README.md"
 
+
+[dependencies]
+regex = "1"

src/lib.rs

@@ -2,8 +2,27 @@ pub mod ytd;
 
 #[cfg(test)]
 mod tests {
+    use regex::Regex;
+    use std::env;
+
     #[test]
-    fn it_works() {
-        assert_eq!(2 + 2, 4);
+    fn version() {
+        let ytd = crate::ytd::YoutubeDL::new(
+            env::current_dir()
+                .expect("couldn't get working directory")
+                .to_str()
+                .unwrap(),
+            // get youtube-dl version
+            vec![crate::ytd::Arg::new("--version")],
+            String::new(),
+        )
+        .expect("Couldn't create youtube-dl");
+
+        let regex = Regex::new(r"\d{4}\.\d{2}\.\d{2}").unwrap();
+        let output = ytd.download();
+
+        // check output
+        // fails if youtube-dl is not installed
+        assert!(regex.is_match(output.output()));
     }
 }