To test this manually, click on "hello", and extend selection to right by pressing right arrow keys with shift twice. Then click again on "world" and extend selection twice the same way.

• EXPECT: mousedown
• EXPECT: selectionchange
• EXPECT: mouseup
• EXPECT: click
• EXPECT: keydown
• EXPECT: keyup
• EXPECT: selectionchange
• EXPECT: keydown
• EXPECT: keyup
• EXPECT: selectionchange
• EXPECT: mousedown
• EXPECT: selectionchange
• OPTIONAL: selectionchange
• EXPECT: mouseup
• EXPECT: click
• EXPECT: keydown
• EXPECT: keyup
• EXPECT: selectionchange
• EXPECT: keydown
• EXPECT: keyup
• EXPECT: selectionchange