diff --git a/src/tags.rs b/src/tags.rs
index 7418254..921dcf8 100644
--- a/src/tags.rs
+++ b/src/tags.rs
@@ -29,13 +29,23 @@ pub struct Tags {
     pub results: Vec<Images>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Display)]
 pub enum Error {
     InvalidCharacter(char),
     Fetching(String),
     Converting(String),
 }
 
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::InvalidCharacter(c) => write!(f, "Invalid Character: {}", c),
+            Error::Fetching(s) => write!(f, "Fetching error: {}", s),
+            Error::Converting(s) => write!(f, "Converting error: {}", s),
+        }
+    }
+}
+
 impl Tags {
     pub fn new(repo: String) -> Result<Self, Error> {
         // let repo = Self::check_repo(repo)?;
@@ -102,3 +112,28 @@ fn format_time_nice(time: chrono::Duration) -> String {
         format!("{} Sekunden", time.num_seconds())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::tags;
+    #[test]
+    fn test_check_repo() {
+        let check_eq = |s, s2| {
+            assert_eq!(&tags::Tags::check_repo(String::from(s)).unwrap(), s2);
+        };
+        let check_neq = |s, s2| {
+            assert_ne!(&tags::Tags::check_repo(String::from(s)).unwrap(), s2);
+        };
+        let check_err = |s: &str| {
+            assert_eq!(tags::Tags::check_repo(String::from(s)).is_err(), true);
+        };
+
+        check_eq("nginx", "library/nginx");
+        check_neq("nginx", "nginx");
+        check_eq("rocketchat/rocket.chat", "rocketchat/rocket.chat");
+        check_eq("mysql", "library/mysql");
+        check_neq("mysql", "mysql");
+        check_err("nginxä");
+        check_err("nginx²");
+    }
+}
diff --git a/src/ui.rs b/src/ui.rs
index 93416fd..c65e333 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -106,14 +106,14 @@ impl Ui {
                 },
                 Ok(Key::Char(key)) => {
                     if ui.state == State::EditRepo {
-                        ui.tags = tag_list::TagList::with_status("Editing Repository");
+                        ui.show_info("Editing Repository");
                     }
                     ui.repo.handle_input(&ui.state, Key::Char(key));
                     ui.tags.handle_input(&ui.state, Key::Char(key));
                 }
                 Ok(Key::Backspace) => {
                     if ui.state == State::EditRepo {
-                        ui.tags = tag_list::TagList::with_status("Editing Repository");
+                        ui.show_info("Editing Repository");
                     }
                     ui.repo.handle_input(&ui.state, Key::Backspace);
                     ui.tags.handle_input(&ui.state, Key::Backspace);
@@ -121,7 +121,7 @@ impl Ui {
                 Ok(Key::Up) => {
                     if ui.state == State::SelectService && ui.services.find_previous_match() {
                         match ui.services.extract_repo() {
-                            Err(_) => ui.tags = tag_list::TagList::with_status("No image found"),
+                            Err(_) => ui.show_info("No image found"),
                             Ok(s) => ui.repo.set(s),
                         }
                     }
@@ -131,10 +131,13 @@ impl Ui {
                 Ok(Key::Down) => match ui.state {
                     State::SelectService if ui.services.find_next_match() => {
                         match ui.services.extract_repo() {
-                            Err(_) => ui.tags = tag_list::TagList::with_status("No image found"),
+                            Err(e) => ui.show_info(&format!("{}", e)),
                             Ok(s) => {
                                 let repo = match crate::tags::Tags::check_repo(s) {
-                                    Err(_) => continue,
+                                    Err(e) => {
+                                        ui.show_info(&format!("{}", e));
+                                        continue;
+                                    }
                                     Ok(s) => s,
                                 };
                                 ui.repo.set(repo);
@@ -160,6 +163,10 @@ impl Ui {
         terminal.clear().unwrap();
     }
 
+    fn show_info(&mut self, error: &str) {
+        self.tags = tag_list::TagList::with_status(error);
+    }
+
     pub fn spawn_stdin_channel(&self) -> mpsc::Receiver<termion::event::Key> {
         let (tx, rx) = mpsc::channel::<termion::event::Key>();
 
diff --git a/src/widget/service_switcher.rs b/src/widget/service_switcher.rs
index 2fa8409..fea7996 100644
--- a/src/widget/service_switcher.rs
+++ b/src/widget/service_switcher.rs
@@ -1,3 +1,4 @@
+use std::fmt;
 use std::fs::File;
 use std::io::BufRead;
 use std::io::BufReader;
@@ -9,12 +10,21 @@ use tui::widgets::{Block, Borders, List, ListState};
 
 use crate::ui::State;
 
-#[derive(Debug)]
+#[derive(Debug, Display)]
 pub enum Error {
     NoneSelected,
     Parsing(String),
 }
 
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::NoneSelected => write!(f, "None selected"),
+            Error::Parsing(s) => write!(f, "Parsing error: {}", s),
+        }
+    }
+}
+
 pub struct ServiceSwitcher {
     list: Vec<String>,
     state: ListState,