Fix redundant clone issue and add testcases (#238)

Signed-off-by: Aisuko <urakiny@gmail.com>

src/config.rs

@@ -51,3 +51,40 @@ pub fn get_backups_flder() -> PathBuf {
 pub fn get_boilr_links_path() -> PathBuf {
     get_config_folder().join("links")
 }
+
+
+#[cfg(test)]
+mod tests{
+    use std::path::PathBuf;
+
+    use super::get_config_folder;
+
+    #[test]
+
+    #[cfg(target_family = "unix")]
+    fn check_return_xdg_config_path(){
+
+        // Parameters for set environment 'XDG_CONFIG_HOME'
+        std::env::set_var("XDG_CONFIG_HOME", std::env::var("HOME").unwrap()+"/.config/boilr");
+
+        let xdg_config_home=std::env::var("XDG_CONFIG_HOME").unwrap();
+        let config_path=get_config_folder();
+        let test_path=PathBuf::from(xdg_config_home);
+
+        assert_eq!(config_path,test_path);
+    }
+
+
+    #[test]
+
+    #[cfg(target_family = "unix")]
+    fn check_return_config_path(){
+
+        std::env::set_var("XDG_CONFIG_HOME", std::env::var("HOME").unwrap()+"/.config/boilr");
+        
+        let config_path=get_config_folder();
+        let current_path=std::env::var("HOME").unwrap()+"/.config/boilr";
+
+        assert_eq!(config_path,PathBuf::from(current_path));
+    }
+}