The methods and apparatuses disclosed herein generally relate to optimizing the creation and loading of application interface layouts by providing a platform for generating configuration files for mobile applications. The test unit comprises a stem having a first end and a second end, the stem defining at least one flow channel extending between the first end and the second end. The inner cannula is driven by both a rotary motor and a reciprocating motor. The clear cycle can dislodge debris or water condensate from the flow path.