@@ -0,0 +1,403 @@
+package org.fxmisc.richtext.model;%0A%0Aimport org.fxmisc.richtext.InlineCssTextArea;%0Aimport org.junit.Test;%0A%0Apublic class AreaTest %7B%0A%0A    private InlineCssTextArea area = new InlineCssTextArea();%0A%0A    @Test%0A    public void deletingTextThatWasJustInsertedShouldNotMergeTheTwoChanges() %7B%0A        area.replaceText(0, 0, %22text%22);%0A        area.replaceText(0, area.getLength(), %22%22);%0A        area.undo();%0A    %7D%0A%7D%0A

Add test to insure mergeWith does not throw Exception