Test Case Generator
Turn an API, validation ruleset, or function into a full test matrix.
Describe an API endpoint, Laravel validation rules, a JSON response, a function, form fields, or a model's CRUD operations, and generate happy-path, validation, boundary, auth, and edge-case test scenarios — then export ready-to-run Pest, PHPUnit, Vitest, Jest, pytest, JUnit, xUnit, Go, or Rust test code. Runs entirely in your browser.
What is a test case generator?
Most test-code generators do one thing: paste some code, get some tests. This tool works differently — it separates what you're testing from which scenarios exist from how a specific framework writes them. That separation is what lets an endpoint, a validation ruleset, a JSON response, and a plain function all feed the same boundary-value math and the same edge-case checklist, then export to whichever of the ten supported frameworks you actually use — without the underlying scenario logic ever being duplicated per language.
The flow is deliberate: define what's under test, generate a scenario matrix, pick which scenarios you actually want, choose a framework, then generate code. No step skips ahead to a wall of code before you've had a chance to see — and prune — what's actually being tested.
Boundary value analysis, explained
Most validation bugs live at the edges of a valid range, not in the middle of it. For a field with min:3, max:100, the generator doesn't just try one valid and one invalid value — it tries all six boundary points: 2, 3, 4, 99, 100, and 101 — min-1, min, min+1, max-1, max, max+1. The same math applies to numeric fields and function parameters: an age field with min:18, max:100 gets 17, 18, 19, 99, 100, 101 — the exact set a careful human reviewer would reach for.
Suggested scaffolds, not guarantees
This tool never invents business logic it wasn't told about. It won't assume a duplicate email returns 422 instead of 409, that a forbidden request returns 403 instead of 401, or what makes a resource “belong” to a user. Scenarios that depend on that kind of context are generated and clearly marked Configurable in the matrix, with a TODO in the exported code instead of a fabricated assertion.
Every export is a starting point that assumes review — a scaffold built from exactly what you supplied, not a claim that the tests are complete or production-ready.
Where the generator invests its effort
Ten frameworks generate real code today: Laravel Pest, Laravel PHPUnit, TypeScript + Vitest, Jest + Supertest, Python + pytest, FastAPI, Java JUnit 5 + Spring MockMvc, C# xUnit, Go (testing/httptest), and Rust (#[test] / Tokio). A handful of others — React Testing Library, Django, Kotlin, RSpec, Dart/Flutter, and more — are visible in the picker as a roadmap, but intentionally generate nothing yet rather than ship a half-correct implementation.
More developer tools
Already have a response to test against? Inspect it first with the API Response & JSON Inspector. Need realistic input data before you can even write the scenarios? The Mock Data Generator builds CSV, JSON, and SQL fixtures from a schema. Building out the rest of your project scaffolding? The .gitignore Generator and Cron Expression Builder round out a typical setup — or browse the full Developer Resources Directory.
Common questions
What is a test case generator?+
A tool that turns a description of what you're testing — an API endpoint, a set of validation rules, a JSON response, a function, form fields, or a model's CRUD operations — into a structured list of test scenarios (happy path, validation, boundary, auth, edge cases), which you can then export as real test code in the framework you use.
Can it generate Laravel Pest tests?+
Yes — Pest is a first-class framework here. Select any input mode, generate the scenario matrix, choose Pest, and get idiomatic it('...', function () { ... }) test blocks.
Can it convert Laravel validation rules into tests?+
Yes — paste a Laravel validation array (either the array-of-rules form or the pipe-string form) and it's parsed into fields with their types, requiredness, and boundaries, then turned into missing/null/empty-string, wrong-type, and min/max boundary scenarios. Rules it doesn't recognize are flagged, not silently guessed at.
Does it support PHPUnit?+
Yes — the same scenario matrix exports to Laravel-flavored PHPUnit feature test classes as well as Pest.
Does it support Jest and Vitest?+
Yes — Vitest renders fetch-based HTTP scenarios and plain function-call unit tests, and Jest ships with a Supertest-based request(app) pattern for API scenarios.
Can I generate pytest tests?+
Yes, including a FastAPI-flavored variant that swaps in FastAPI's TestClient — both share the exact same scenario rendering, so there's no duplicated logic between them.
Does it generate API edge cases?+
Yes, but only the ones that make sense for your configuration — empty bodies and malformed JSON only appear for methods with a body, not-found and ID boundary cases only appear when your path has a {id}-style parameter, and so on.
Can it generate boundary-value tests?+
Yes — for any field or function parameter with a min/max, it generates the classic min-1, min, min+1, max-1, max, max+1 set, using proper boundary value analysis rather than arbitrary sample values.
Does it support authentication and authorization tests?+
Yes for authentication (missing credentials, invalid credentials, authenticated request) when you select an auth type. Authorization tests (role checks, resource ownership) are generated as clearly-marked scenarios you need to configure — the tool has no way to know your actual roles or ownership rules.
Can I generate tests from JSON API responses?+
Yes — paste a response and it's inspected the same way the API Response & JSON Inspector does, then turned into structure and per-key existence/type assertion templates.
Is my code uploaded anywhere?+
No. Parsing, scenario generation, and code generation all run locally in your browser with plain TypeScript — nothing you paste here is sent to 92 Nodes or any third party.
Are generated tests guaranteed to be correct?+
No — treat them as suggested test scaffolds based only on what you told the generator. It never invents business-specific behavior (like whether a duplicate email returns 422 or 409, or whether a check returns 401 vs 403) — those scenarios are left for you to configure, and every export carries a reminder to review business-specific behavior before relying on the generated tests.
More free resources
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