This is a testharness.js-based test.
[FAIL] Inserting "XY" after deleting last character in a non-collapsed range of a link in <b> (Direct typing) in <p><b><a href="about:blank">abc[d]</a></b></p>
assert_in_array: value "<p><b><a href=\\"about:blank\\">abcX</a>Y</b></p>" not in array ["<p><b><a href=\\"about:blank\\">abcXY</a></b></p>", "<p><b><a href=\\"about:blank\\">abcXY</a></b><br></p>"]
Harness: the test ran to completion.