1 files changed, 16 insertions, 0 deletions
diff --git a/tests/control.rs b/tests/control.rs
index aba6915..8372cea 100644
--- a/tests/control.rs
+++ b/tests/control.rs
@@ -5,15 +5,31 @@ fn bel() {
     let mut parser = vt100::Parser::default();
     assert_eq!(parser.screen().audible_bell_count(), 0);
 
+    let screen = parser.screen().clone();
     parser.process(b"\x07");
     assert_eq!(parser.screen().audible_bell_count(), 1);
     assert_eq!(parser.screen().audible_bell_count(), 1);
+    assert_eq!(parser.screen().contents_diff(&screen), b"\x07");
 
+    let screen = parser.screen().clone();
     parser.process(b"\x07");
     assert_eq!(parser.screen().audible_bell_count(), 2);
+    assert_eq!(parser.screen().contents_diff(&screen), b"\x07");
 
+    let screen = parser.screen().clone();
     parser.process(b"\x07\x07\x07");
     assert_eq!(parser.screen().audible_bell_count(), 5);
+    assert_eq!(parser.screen().contents_diff(&screen), b"\x07");
+
+    let screen = parser.screen().clone();
+    parser.process(b"foo");
+    assert_eq!(parser.screen().audible_bell_count(), 5);
+    assert_eq!(parser.screen().contents_diff(&screen), b"foo");
+
+    let screen = parser.screen().clone();
+    parser.process(b"ba\x07r");
+    assert_eq!(parser.screen().audible_bell_count(), 6);
+    assert_eq!(parser.screen().contents_diff(&screen), b"bar\x07");
 }
 
 #[test]