Added Rust example

src/rust/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "rust_example"
+version = "0.1.0"
+edition = "2018"
+
+
+[dependencies]

src/rust/src/main.rs

@@ -0,0 +1,21 @@
+#[cfg(test)]
+mod tests; // INCLUDE TEST FILE
+
+fn main() {
+    let args: Vec<String> = std::env::args().skip(1).collect();
+    let language = match args.get(0) {
+        Some(s) => s,
+        None => "en" // DEFAULT TO ENGLISH
+    };
+
+    println!("{}", hi(&language));
+}
+
+fn hi(lang: &str) -> String {
+    match lang {
+        "en" => "Hello World!".to_owned(),
+        "de" => "Hallo Welt!".to_owned(),
+        "dk" => "Hey Verden!".to_owned(),
+        _ => panic!("language not supported")
+    }
+}

src/rust/src/tests.rs

@@ -0,0 +1,22 @@
+use super::*;
+
+#[test]
+fn test_hi_en() {
+    assert_eq!(&hi("en"), "Hello World!");
+}
+
+#[test]
+fn test_hi_de() {
+    assert_eq!(&hi("de"), "Hallo Welt!");
+}
+
+#[test]
+fn test_hi_dk() {
+    assert_eq!(&hi("dk"), "Hey Verden!");
+}
+
+#[test]
+#[should_panic]
+fn test_hi_unknown() {
+    hi("0101");
+}