Fix tests

tests/fixture/success/exercises/compSuccess.rs

@@ -0,0 +1,2 @@
+fn main() {
+}

tests/fixture/success/exercises/testSuccess.rs

@@ -0,0 +1,5 @@
+#[test]
+fn passing() {
+    println!("THIS TEST TOO SHALL PASS");
+    assert!(true);
+}