Add FindUnderExpand tests.
Add FindUnderExpand tests.

Close limetext#109.

farhaanbukhsh/lime,crr0004/lime,crr0004/lime,farhaanbukhsh/lime,crr0004/lime,farhaanbukhsh/lime,crr0004/lime,farhaanbukhsh/lime,crr0004/lime,farhaanbukhsh/lime