During April 2025, dl.soluz developed a native DOS API emulation testing suite for the Spice86 repository, focusing on improving verification of partially implemented DOS APIs. Leveraging Assembly, C programming, and shell scripting, dl.soluz created a curated set of native DOS test examples and supporting programs to demonstrate program execution and TSR behavior. The suite included build and clean scripts, as well as test programs like hello, exec, c_exec, and tsr, enabling repeatable and CI-ready testing. This work established a concrete baseline for regression testing, accelerated API stabilization, and enhanced the reliability and coverage of DOS API emulation within Spice86.