get_parent_directory_name tests

duckscript_sdk/src/utils/io_test.rs

@@ -1,5 +1,26 @@
 use super::*;
 
+#[test]
+fn get_parent_directory_name_with_dir() {
+    let directory = get_parent_directory_name("./dir/file.txt");
+
+    assert_eq!(directory.unwrap(), "./dir");
+}
+
+#[test]
+fn get_parent_directory_name_found() {
+    let directory = get_parent_directory_name("./file.txt");
+
+    assert_eq!(directory.unwrap(), ".");
+}
+
+#[test]
+fn get_parent_directory_name_file_only() {
+    let directory = get_parent_directory_name("file.txt");
+
+    assert!(directory.is_none());
+}
+
 #[test]
 fn read_text_file_found() {
     let text = read_text_file("./Cargo.toml");