test: Implemented UI snapshot tests

src/ui/sonarr_ui/system/system_ui_tests.rs

@@ -2,11 +2,13 @@
 mod tests {
   use strum::IntoEnumIterator;
 
+  use crate::app::App;
   use crate::models::servarr_data::sonarr::sonarr_data::{
     ActiveSonarrBlock, SYSTEM_DETAILS_BLOCKS,
   };
   use crate::ui::DrawUi;
   use crate::ui::sonarr_ui::system::SystemUi;
+  use crate::ui::ui_test_utils::test_utils::render_to_string_with_app;
 
   #[test]
   fn test_system_ui_accepts() {
@@ -22,4 +24,33 @@ mod tests {
       }
     });
   }
+
+  mod snapshot_tests {
+    use super::*;
+
+    #[test]
+    fn test_system_ui_renders_loading_state() {
+      let mut app = App::test_default();
+      app.is_loading = true;
+      app.push_navigation_stack(ActiveSonarrBlock::System.into());
+
+      let output = render_to_string_with_app(120, 30, &mut app, |f, app| {
+        SystemUi::draw(f, app, f.area());
+      });
+
+      insta::assert_snapshot!(output);
+    }
+
+    #[test]
+    fn test_system_ui_renders_system_menu() {
+      let mut app = App::test_default();
+      app.push_navigation_stack(ActiveSonarrBlock::System.into());
+
+      let output = render_to_string_with_app(120, 30, &mut app, |f, app| {
+        SystemUi::draw(f, app, f.area());
+      });
+
+      insta::assert_snapshot!(output);
+    }
+  }
 }