add 8, 11, 12

src/assignments/assignment11/tv_room_grade.rs

@@ -0,0 +1,32 @@
+//! Test cases for assignment11/tv_room.rs
+
+#[cfg(test)]
+mod test_tv_room {
+    use super::super::tv_room::*;
+
+    #[test]
+    fn test_tv_room() {
+        let tv_room = TVRoom::new();
+        assert!(!tv_room.is_opened());
+
+        // Turn on and add new guests.
+        let manager = tv_room.open().unwrap();
+        assert!(tv_room.is_opened());
+        let guest1 = manager.new_guest();
+        let guest2 = manager.new_guest();
+        drop(manager);
+        drop(guest1);
+        assert!(tv_room.open().is_none());
+        drop(guest2);
+        assert!(!tv_room.is_opened());
+
+        // Turn on and add new guests.
+        let manager = tv_room.open().unwrap();
+        assert!(tv_room.is_opened());
+        let guest3 = manager.new_guest();
+        drop(guest3);
+        assert!(tv_room.is_opened());
+        drop(manager);
+        assert!(!tv_room.is_opened());
+    }
+}