RVVTS is an open-source, modular framework for comprehensive testing of RISC-V Vector implementations and other RISC-V extensions. The framework automates test generation, execution, coverage measurement, and failure analysis using techniques like instruction isolation and code minimization, and has uncovered bugs in multiple RISC-V implementations including PULP Ara, Sail-RISC-V, RISC-V VP++, and QEMU.