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During a rewrite or migration, the biggest fear is breaking existing business logic. Praxys utilizes AI-generated test suites and dual-run methodologies to prove that your new, modernized system behaves exactly like your impenetrable legacy core. We automate the creation of edge cases, assertions, and mock data.
Why migrations fail during User Acceptance
Legacy systems contain decades of undocumented 'quirks' and exception handling that manual testers miss.
Writing comprehensive unit and integration test suites manually can take longer than writing the application itself.
Replicating production data scenarios safely for testing is notoriously difficult in legacy environments.
Without 100% confidence in equivalence, teams delay going live for months, increasing costs.
We solve the testing bottleneck by using AI to analyze legacy code and automatically generate thousands of test cases in modern frameworks (JUnit, Jest, PyTest). We capture traffic from the legacy system and replay it against the new system, mathematically proving equivalence.
Rigorous testing for critical systems
Automatically parse legacy code logic and generate corresponding unit test suites for the newly refactored code.
Mirror live production traffic from the old system and send it to the new system, comparing the responses byte-for-byte.
Automated verification that the new database schema or ORM logic successfully matches legacy data states.
How we prove complete functional parity
Instrumenting the legacy system to capture current inputs, state changes, and outputs.
Analyzing the code and logs to automatically generate unit and integration tests for the target modern language.
Running the generated suites continuously within the CI/CD pipeline of the new application.
Mirroring live traffic and comparing the exact API or data base outputs between Old and New.
Providing a verifiable audit trail proving that under all tested conditions, the results are identical.
The tools we use to prove parity
Contact us to build an automated regression safety net for your most critical system migrations.