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docs/testing-with-bun.md

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+# Testing with Bun in Stock Bot Platform
+
+This project uses [Bun Test](https://bun.sh/docs/cli/test) for all testing needs. Bun Test provides a fast, modern testing experience with Jest-like API compatibility.
+
+## Getting Started
+
+To run tests:
+
+```bash
+# Run all tests (using Turbo)
+bun test
+
+# Run tests in watch mode
+bun test:watch
+
+# Run tests with coverage
+bun test:coverage
+
+# Run specific test types
+bun test:unit
+bun test:integration
+bun test:e2e
+```
+
+## Library-specific Testing
+
+Each library has its own testing configuration in a `bunfig.toml` file. This allows for library-specific test settings while maintaining consistent patterns across the codebase.
+
+### Example bunfig.toml:
+
+```toml
+[test]
+preload = ["./test/setup.ts"]
+timeout = 5000
+
+[test.env]
+NODE_ENV = "test"
+
+[bun]
+paths = {
+  "@/*" = ["./src/*"]
+}
+```
+
+## Migration from Jest
+
+This project has been fully migrated from Jest to Bun Test. Some key differences:
+
+1. **Import statements**: Use `import { describe, it, expect } from 'bun:test'` instead of Jest imports
+2. **Mocking**: Use Bun's built-in mocking utilities (see global `spyOn` helper)
+3. **Configuration**: Use `bunfig.toml` instead of Jest config files
+4. **Test helpers**: Test helpers are available globally via `global.testHelpers`
+
+## Best Practices
+
+- Use `describe` and `it` for test organization
+- Use relative imports (`../src/`) in test files
+- Keep test setup clean with proper `beforeEach` and `afterEach` handlers
+- For complex test scenarios, create dedicated setup files
+
+## Test Environment
+
+- All tests run with `NODE_ENV=test`
+- Console output is silenced by default (restore with `testHelpers.restoreConsole()`)
+- Default timeout is 30 seconds for integration tests, 5 seconds for unit tests