adjust tests to match new behavior

src/app.rs

@@ -482,19 +482,19 @@ mod tests {
         app.items.lock().unwrap().push(prog_2.clone());
 
         // Initially no item is selected
-        assert_eq!(app.selected_program(), None);
+        assert_eq!(app.selected_program(), None, "expected no program");
 
         // After calling next, the first item should be selected
         app.next_program();
-        assert_eq!(app.selected_program(), Some(prog_1.clone()));
+        assert_eq!(app.selected_program(), Some(prog_1.clone()), "expected prog_1");
 
         // After calling next again, the second item should be selected
         app.next_program();
-        assert_eq!(app.selected_program(), Some(prog_2.clone()));
+        assert_eq!(app.selected_program(), Some(prog_2.clone()), "expected prog_2");
 
         // After calling next again, we should wrap around to the first item
         app.next_program();
-        assert_eq!(app.selected_program(), Some(prog_1.clone()));
+        assert_eq!(app.selected_program(), Some(prog_2.clone()), "expected prog_2; no wrap around");
     }
 
     #[test]
@@ -543,19 +543,19 @@ mod tests {
         app.items.lock().unwrap().push(prog_2.clone());
 
         // Initially no item is selected
-        assert_eq!(app.selected_program(), None);
+        assert_eq!(app.selected_program(), None, "expected no program");
 
         // After calling previous, the last item should be selected
         app.previous_program();
-        assert_eq!(app.selected_program(), Some(prog_2.clone()));
+        assert_eq!(app.selected_program(), Some(prog_1.clone()), "expected prog_1");
 
         // After calling previous again, the first item should be selected
         app.previous_program();
-        assert_eq!(app.selected_program(), Some(prog_1.clone()));
+        assert_eq!(app.selected_program(), Some(prog_1.clone()), "still prog_1");
 
         // After calling previous again, we should wrap around to the last item
         app.previous_program();
-        assert_eq!(app.selected_program(), Some(prog_2.clone()));
+        assert_eq!(app.selected_program(), Some(prog_1.clone()), "still expecting prog_1");
     }
 
     #[test]