 
 <prompt> Dey get like 52 weeks for one year, wetin dem dey refer to? Based on di question wey dey before dis one, write one context wey go contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```Di practice of component interface testing fit dey use to check how data dey waka between different units or subsystem components, pass di full integration testing between those units. Di data wey dey pass fit be like "message packets" and dem fit check di range and data types, for data wey dey come from one unit, and test am to see if e dey valid before e enter another unit. One option for interface testing na to keep separate log file of data items wey dey pass, often with timestamp wey dey logged to allow analysis of thousands of cases of data wey dey pass between units for days or weeks. Tests fit include checking how dem dey handle some extreme data values while other interface variables dey pass as normal values. Unusual data values for interface fit help explain why performance dey unexpected for di next unit. Component interface testing na one kind of black-box testing, with focus on di data values pass just di related actions of a subsystem component.``` 