Testing Strategy & Test Writing Guide

Help me create a testing strategy and write better tests.

Project: [WHAT I'M BUILDING]
Language: [JAVASCRIPT / PYTHON / JAVA / OTHER]

Current testing: [NONE / SOME UNIT TESTS / GOOD COVERAGE]
Framework: [JEST / PYTEST / VITEST / CYPRESS / OTHER]

Provide:
1. **Testing Pyramid**: How many unit, integration, and e2e tests I need
2. **What to Test**: Which functions and features are most critical to test
3. **Unit Test Patterns**: Templates for common unit test scenarios
4. **Integration Tests**: Testing component interactions and API endpoints
5. **Mocking Strategy**: When and how to mock dependencies
6. **Test Data**: Managing test fixtures and factories
7. **Edge Cases**: How to identify and test edge cases
8. **TDD Workflow**: How to use test-driven development practically
9. **Coverage Goals**: Realistic coverage targets and what they mean
10. **CI Integration**: Running tests automatically on every push

Help me create a testing strategy and write better tests.

Project: [WHAT I'M BUILDING]
Language: [JAVASCRIPT / PYTHON / JAVA / OTHER]
Current testing: [NONE / SOME UNIT TESTS / GOOD COVERAGE]
Framework: [JEST / PYTEST / VITEST / CYPRESS / OTHER]

Provide:
1. **Testing Pyramid**: How many unit, integration, and e2e tests I need
2. **What to Test**: Which functions and features are most critical to test
3. **Unit Test Patterns**: Templates for common unit test scenarios
4. **Integration Tests**: Testing component interactions and API endpoints
5. **Mocking Strategy**: When and how to mock dependencies
6. **Test Data**: Managing test fixtures and factories
7. **Edge Cases**: How to identify and test edge cases
8. **TDD Workflow**: How to use test-driven development practically
9. **Coverage Goals**: Realistic coverage targets and what they mean
10. **CI Integration**: Running tests automatically on every push