Invariant Workshop
Collaborative sessions to identify the properties your system must always maintain. This is the foundation—get the invariants right and the tests practically write themselves.
// Service
Property-Based Testing
Example-based tests prove your code works for the cases you thought of. Property-based tests prove it works for cases you didn't know existed.
The hardest bugs to find are the ones you never thought to test for. Property-based testing flips the script: instead of writing individual test cases, you define the rules your system must always obey, and the framework generates thousands of inputs trying to break those rules. I help teams implement this approach with meaningful invariants, well-designed generators, and integration into existing CI/CD pipelines—not just academic exercises.
// What You Get
What this engagement covers
Generator Design
Custom data generators refined for your specific domain. Good generators are the difference between finding real bugs and wasting CPU cycles on irrelevant inputs.
Framework Rollout
Implementation with PropEr, Hypothesis, or custom frameworks matched to your stack. Includes shrinking strategies so failing cases are minimal and debuggable.
CI/CD Integration
Property-based tests wired into your existing test suites and pipelines. Configured to run fast in CI but deep on nightly builds for maximum coverage.
// Why This Works
Why teams bring me in for property-based testing
01
Bugs unit tests missed for months
Property-based tests that caught integer overflow bugs, off-by-one errors, and boundary violations that example-based tests never exercised.
02
Race conditions exposed
Generators that found concurrency bugs in supposedly thread-safe code by exploring interleavings no developer would think to test manually.
03
Targeted fuzzing strategies
Input generation focused on the boundaries that actually break your system—not random noise, but informed exploration of your domain's edge cases.
// Work Together
Open Contact FormFind the bugs your example tests can't
Property-based testing isn't about writing more tests—it's about writing tests that explore the space your code operates in. If you're building anything where correctness matters, let's talk about what your invariants actually are.