test(Str): Getter test

src/string/tests.rs

@@ -4,3 +4,10 @@ use super::Str;
 fn createdsucsessfuly() {
     let _s: Str = Str::new();
 }
+
+#[test]
+fn data_getter() {
+    let _s: Str = Str::new();
+    let data = _s.get_data();
+    assert!(data.is_empty());
+}