ai-engineer-agent/test-generator

Test Generator

Generate comprehensive tests for $ARGUMENTS:

Process

1. Read the source file to understand the API surface
2. Detect the language and testing framework from the project setup
3. Identify existing tests to avoid duplication
4. Generate tests covering:

Test Categories

Happy Path Tests

• Normal inputs produce expected outputs
• All public methods/functions are exercised
• Common use cases are covered

Edge Cases

• Empty inputs (empty strings, arrays, objects)
• Boundary values (0, -1, MAX_INT, empty collections)
• Single-element collections
• Unicode and special characters

Error Cases

• Invalid inputs (wrong types, out-of-range values)
• Missing required fields
• Network/I/O failures (when applicable)
• Permission errors

Integration Tests (when appropriate)

• Component interactions
• Database operations
• API endpoint responses

Style Rules

• Follow the existing test style in the project
• Use descriptive test names that read as documentation
• Use arrange-act-assert (given-when-then) structure
• One assertion concept per test
• Mock external dependencies, test internal logic directly
• Use factories/builders for test data, not inline object literals

Output

Create the test file at the conventional location for the project's language and framework. If tests already exist, add missing test cases.