Test Generator

Overview

Analyze existing source code and automatically generate comprehensive test suites with unit tests, edge cases, mocks, and integration scenarios for the specified testing framework.

When to Use

• •Adding tests to a legacy codebase with zero coverage
• •Generating test scaffolding after writing new features
• •Bootstrapping a test suite before a major refactor
• •Creating regression tests from bug reports
• •Ensuring API endpoint coverage before deployment

Instructions

1. •Accept inputs: source file path(s) or directory, test framework (jest/pytest/vitest/playwright), coverage target (%), test type (unit/integration/e2e/all).
2. •Parse the source code to identify: functions, classes, methods, API routes, exported interfaces.
3. •For each function/method: analyze inputs, outputs, side effects, and error conditions.
4. •Generate test cases covering: happy path, edge cases (null, empty, boundary values), error/exception paths.
5. •Generate mocks for external dependencies (databases, APIs, file system).
6. •For API routes: generate request/response tests with valid and invalid payloads.
7. •Write test files following the project's naming convention (e.g., *.test.ts, test_*.py).
8. •Return coverage estimate, test file paths, and list of untestable code sections.

Environment

TEST_FRAMEWORK=jest
SOURCE_DIR=./src
OUTPUT_DIR=./tests
COVERAGE_TARGET=80
INCLUDE_MOCKS=true

Examples

Input:

file: ./src/api/orders.ts
framework: jest
type: unit+integration
coverage_target: 85

Output:

Test suite generated: ./tests/api/orders.test.ts
Test cases: 24 (18 unit, 6 integration)
Edge cases covered: null inputs, empty arrays, 404/500 responses
Mocks generated: supabase client, stripe API
Estimated coverage: 87%