Update test-markdown-basics.md (#5655)

tests/test-markdown-basics.md

@@ -5,6 +5,7 @@ Tests for text style, code blocks, in-line code and images, lines, block quotes,
 
 **The following text should render as:**  
 _Italics_
+_Ita_lics_
 *Italics*
 **Bold**
 ***Bold-italics***