335         let mut buf = [0xAA; 4];  in test_device()  localVariable
336         flash.read(0, &mut buf).unwrap();  in test_device()
337         assert_eq!(buf, [0x55, erased_val, erased_val, erased_val]);  in test_device()
340         flash.read(0, &mut buf).unwrap();  in test_device()
341         assert_eq!(buf, [erased_val; 4]);  in test_device()
352         let mut buf = Vec::new();  in test_device()  localVariable
355             buf.resize(sector.size, 0);  in test_device()
356             flash.read(sector.base, &mut buf).unwrap();  in test_device()
357             assert_eq!(buf.first(), Some(&byte));  in test_device()
358             assert_eq!(buf.last(), Some(&byte));  in test_device()
359             assert!(buf[1..buf.len()-1].iter().all(|&x| x == erased_val));  in test_device()