The deep nature of COTS components is that they are shut software units for end users. In the process of reuse, test is a natural and primary step for obtaining information on component capabilities. Such an assessment and evaluation is however restricted to the single access and use of interfaces. To attenuate this, Built-In Test (BIT) components are introduced. These components enhance the means by which COTS components may be, in a broad sense, acquired from Internet. In this paper, we develop two strategies. Firstly, distinct BIT versions of original components are implemented. Secondly, BIT components are built from scratch in order to, for vendors, supply components that have customizable and innovative test and configuration features. In both cases, the assistance of a code generator allows the introduction of extra properties for viewing and handling BIT components in Web browsers. Trust results from this approach that demonstrates the necessity for supporting and instrumenting component procurement in general. A “true” component marketplace on Internet becomes then conceivable.