Added single unit test necessary for system

src/kernel/system.rs

@@ -61,3 +61,25 @@ pub enum ObjectType {
     ThreadType,
     InvalidType
 }
+
+#[cfg(test)]
+mod tests {
+
+    use crate::{System, Machine};
+
+    macro_rules! init_system {
+        () => {{
+            let m = Machine::init_machine();
+            init_system!(m)
+        }};
+        ($a:expr) => {{
+            System::new($a)
+        }};
+    }
+
+    #[test]
+    fn test_init_system() {
+        init_system!();
+    }
+
+}