The TestMart's Horizon: AI Validation for a Post-RSAT Dynamics 365 World

MIAMI, FL – July 14, 2026 – As enterprises race to integrate AI into their core operations, the systems that run the business are under unprecedented pressure to evolve. Today, The TestMart, an AI-powered software validation company, launched Horizon, a new platform built exclusively for the sprawling Microsoft Dynamics 365 ecosystem. The launch enters a market at a critical inflection point, with Microsoft's own Regression Suite Automation Tool (RSAT) set for retirement in May 2027, creating a significant vacuum for organizations dependent on the ERP suite.

Horizon’s proposition is a nuanced one: to harness the speed of artificial intelligence for creating tests while enforcing the rigid, predictable discipline of deterministic execution for validating them. It’s a direct response to a central paradox facing modern CIOs: how to innovate at the speed of AI without compromising the governance, reliability, and security that business-critical systems demand. For companies running everything from global supply chains to financial reporting on Dynamics 365, the stakes couldn't be higher.

The AI-Trust Paradox: Speed vs. Reliability

At the heart of The TestMart's strategy is a clear architectural separation. The Horizon platform uses AI to accelerate the front end of the validation process—test creation—but deliberately keeps it away from the final judgment call.

"The engineering principle behind Horizon was simple: AI should help customers understand and create the right tests faster, but production execution has to remain predictable and trusted," explained Matthew Sabath, Chief Product and Technology Officer at The TestMart. "That's why AI captures intent during authoring while every validation runs deterministically, with repeatable results and a full audit trail."

This concept of "deterministic execution" is the platform's anchor. It means a given test will follow the exact same path and produce the same traceable evidence every time it runs. For sectors like financial services or manufacturing, where a single deviation can have massive compliance or operational consequences, this predictability is not just a feature—it's a requirement. The platform promises to deliver this consistency through what it calls "Headless Validation," testing APIs, business logic, and data layers directly, aiming to catch issues before they ever surface on a user's screen.

This contrasts sharply with a purely AI-driven approach where the testing agent itself might introduce variability. By using AI for "intent-based authoring," Horizon allows business users to describe a workflow in plain terms, which the platform then translates into a robust, executable test in minutes, without a single line of script. It’s a move designed to democratize test creation while centralizing control and auditability over the execution, solving the dual challenge of speed and trust.

Navigating a Post-RSAT Landscape

The timing of Horizon's launch is anything but coincidental. With Microsoft ending support for its free RSAT tool next year, thousands of organizations are actively seeking a successor. While RSAT provided a baseline for automation, its limitations—fragility in the face of frequent UI updates, difficulty with complex end-to-end scenarios, and high maintenance overhead—have become increasingly apparent in the era of Microsoft's continuous 'release waves'.

Enter a competitive field of alternatives, including platforms from Leapwork, Executive Automats, and ACCELQ, all vying to become the new standard. The TestMart aims to differentiate Horizon by being purpose-built for Dynamics 365 and its specific challenges. The platform's five-layer self-healing technology, for instance, is engineered to keep tests resilient through Microsoft's relentless update cycles, a major pain point for users of more generic or brittle automation tools.

"Organizations are adopting new technologies, expanding their Dynamics 365 environments and embracing AI at an unprecedented pace," said Dan Diefendorf, Chief Executive Officer of The TestMart. "They need validation that moves as quickly as innovation while maintaining the reliability, governance, and security standards their businesses depend on. Horizon delivers that balance."

By focusing exclusively on the Dynamics 365 ecosystem, The TestMart is betting that deep domain expertise will outperform one-size-fits-all solutions. This includes providing version intelligence refreshed with every Microsoft release wave and a Test Data Management (TDM) engine to handle the complexities of setting up and cleaning up data within Dynamics 365 and its underlying Dataverse.

Validating the Validators: The New Frontier of AI Agents

Perhaps Horizon's most forward-looking capability is its claim to validate AI agents like Microsoft Copilot with the same rigor applied to traditional workflows. As AI becomes more embedded in enterprise processes—making decisions, generating content, and executing tasks—a new and formidable validation challenge emerges. How do you test a system whose behavior is probabilistic, not predetermined?

Horizon's answer is to focus on the inputs, outputs, and business process impact of the AI agent's actions. By validating the entire workflow in which the agent operates, the platform aims to hold these new digital co-workers to a consistent and auditable standard. This capability connects directly to the growing need for resilient systems that can safely incorporate AI without introducing unforeseen risks or compliance breaches.

This focus on a trusted framework for AI adoption has attracted investor attention. "The strongest enterprise software companies solve complex technical problems in a way customers can adopt and scale," commented Saum Vahdat, CEO of Bridgewest Ventures and a member of The TestMart's board. He noted that the company's deep Dynamics 365 expertise and architecture for repeatable validation give enterprises a practical path for managing AI-driven processes, creating a foundation for durable growth.

Already in production use since June across manufacturing, food and beverage, and financial services, Horizon's business case is built on this foundation of trust. The company is offering predictable enterprise pricing with unlimited tests and users, a clear jab at models that charge per AI execution, which can penalize organizations for scaling their quality assurance efforts. In a rapidly evolving geopolitical and technological landscape, The TestMart is betting that the ability to prove your systems work as intended, every single time, is the ultimate competitive advantage.