AI Unit Test Generator

We support all major testing frameworks: Jest and Vitest for JavaScript and TypeScript, Mocha with Chai for Node.js, pytest for Python, JUnit for Java, xUnit for C# and .NET, Go's built-in testing package, and RSpec for Ruby. Each output uses the framework's idiomatic patterns, assertions, and mocking utilities so the tests integrate seamlessly into your existing suite.

The AI generates tests across multiple categories: happy path tests verifying correct behavior with valid inputs, edge case tests for boundary values like empty strings, zero, and maximum values, error handling tests verifying proper exceptions and error messages, null and undefined input handling, and integration-style tests for functions with dependencies. Each test has a clear, descriptive name.

Framework built-in mocks use Jest's jest.fn() or pytest's unittest.mock to isolate the code under test. Minimal mocking only mocks external dependencies like APIs and databases, keeping internal logic real. No mocking generates integration-style tests that run the actual code path. Choose based on your testing philosophy and what level of isolation you need.

Yes, the AI identifies external dependencies in your code like database calls, API requests, and file system operations, and generates appropriate mocks or stubs for them. It sets up the test fixtures with realistic mock data, handles async operations correctly, and tears down state between tests to prevent test pollution.

Our generator focuses on behavioral testing — each test verifies a specific behavior or requirement, not just that a line was executed. Tests are named with 'should' statements that describe expected behavior, making the test suite serve as living documentation. The Exhaustive mode adds boundary value analysis and equivalence partitioning for thorough coverage.