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Issue Description
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Free AI test code generator to create unit tests automatically. Generate Jest, PyTest, JUnit test cases for Python, JavaScript, Java, PHP, C++, and 100+ programming languages instantly!
Paste code in both editors to see differences
Swapcode's AI test generator automatically creates comprehensive unit tests for 100+ languages. Paste your function or class, select the language, and click "Generate Tests". The AI analyzes parameters, return values, logic flows, and edge cases, then generates test suites using Jest, PyTest, JUnit, or language-specific frameworks—complete with positive cases, negative cases, boundary tests, and mock implementations.
🎯 Coverage:
Unit tests, edge cases, error handling
🧪 Frameworks:
Jest, PyTest, JUnit, and more
⚡ Speed:
Instant test suite generation
Our AI analyzes your code and generates comprehensive test suites with multiple test cases and scenarios.
Paste the function, method, or class you want to test. Specify your testing framework if desired.
AI identifies test scenarios including positive cases, negative cases, edge cases, and boundary conditions.
Receive complete test suite with setup, test cases, assertions, and proper testing framework syntax.
Comprehensive test coverage for your code
Generate unit tests for individual functions, methods, and classes with proper test structure.
Test expected behavior with valid inputs and normal execution paths for happy path scenarios.
Test error handling with invalid inputs, null values, and exception scenarios.
Cover edge cases, boundary conditions, empty inputs, and extreme values.
Include proper assertions to verify expected outputs, return values, and state changes.
Generate mocks and stubs for dependencies, external services, and database calls.
Generate tests for any major testing framework
And many more testing frameworks for 100+ languages
A test code generator is an AI-powered tool that automatically creates unit tests, test cases, and test suites for your code. It analyzes your functions, methods, and classes to generate comprehensive test coverage including positive tests, negative tests, edge cases, and boundary conditions.
The generator creates multiple test types: Unit tests for individual functions, Integration tests for module interactions, Positive test cases (expected behavior), Negative test cases (error handling), Edge cases and boundary conditions, Mock tests for dependencies, and Assertion tests for expected outputs.
We support all major testing frameworks: Jest and Mocha for JavaScript, PyTest and unittest for Python, JUnit and TestNG for Java, Google Test for C++, XCTest for Swift, RSpec for Ruby, and many more. The generator adapts to your language's standard testing framework.
Yes! We offer free test generation with limited daily usage. Free users get 3 test generations per day. For unlimited access, faster processing, and priority support, check out our Pro plans.
We support 100+ programming languages including Python, JavaScript, TypeScript, Java, C++, C#, PHP, Ruby, Go, Rust, Swift, Kotlin, and more. The generator creates tests using language-specific testing frameworks and conventions.
The generator creates comprehensive test suites including: Multiple test cases per function, Positive and negative scenarios, Edge cases and boundary conditions, Input validation tests, Error handling tests, Mock tests for dependencies, and Assertion statements. However, you should always review and customize tests for your specific requirements.
Start creating comprehensive unit tests automatically