1 files changed, 19 insertions, 0 deletions
diff --git a/tests/escape.rs b/tests/escape.rs
index e08a402..96ee762 100644
--- a/tests/escape.rs
+++ b/tests/escape.rs
@@ -125,13 +125,32 @@ fn ris() {
 fn vb() {
     let mut parser = vt100::Parser::default();
     assert_eq!(parser.screen().visual_bell_count(), 0);
+
+    let screen = parser.screen().clone();
     parser.process(b"\x1bg");
     assert_eq!(parser.screen().visual_bell_count(), 1);
     assert_eq!(parser.screen().visual_bell_count(), 1);
+    assert_eq!(parser.screen().contents_diff(&screen), b"\x1bg");
+
+    let screen = parser.screen().clone();
     parser.process(b"\x1bg");
     assert_eq!(parser.screen().visual_bell_count(), 2);
+    assert_eq!(parser.screen().contents_diff(&screen), b"\x1bg");
+
+    let screen = parser.screen().clone();
     parser.process(b"\x1bg\x1bg\x1bg");
     assert_eq!(parser.screen().visual_bell_count(), 5);
+    assert_eq!(parser.screen().contents_diff(&screen), b"\x1bg");
+
+    let screen = parser.screen().clone();
+    parser.process(b"foo");
+    assert_eq!(parser.screen().visual_bell_count(), 5);
+    assert_eq!(parser.screen().contents_diff(&screen), b"foo");
+
+    let screen = parser.screen().clone();
+    parser.process(b"ba\x1bgr");
+    assert_eq!(parser.screen().visual_bell_count(), 6);
+    assert_eq!(parser.screen().contents_diff(&screen), b"bar\x1bg");
 }
 
 #[test]