Test-Driven Development workflow principles. RED-GREEN-REFACTOR cycle.
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What the file says
# TDD Workflow
> Write tests first, code second.
---
## 1. The TDD Cycle
```
🔴 RED → Write failing test
↓
🟢 GREEN → Write minimal code to pass
↓
🔵 REFACTOR → Improve code quality
↓
Repeat...
```
---
## 2. The Three Laws of TDD
1. Write production code only to make a failing test pass
2. Write only enough test to demonstrate failure
3. Write only enough code to make the test pass
---
## 3. RED Phase Principles
### What to Write
| Focus | Example |
|-------|---------|
| Behavior | "should add two numbers" |
| Edge cases | "should handle empty input" |
| Error states | "should throw for invalid data" |
### RED Phase Rules
- Test must fail first
- Test name describes expected behavior
- One assertion per test (ideally)
---
## 4. GREEN Phase Principles
### Minimum Code
| Principle | Meaning |
|-----------|---------|
| **YAGNI** | You Aren't Gonna Need It |
| **Simplest thing** | Write the minimum to pass |
| **No optimization** | Just make it work |
### GREEN Phase Rules
- Don't write unneeded code
- Don't optimize yet
- Pass the test, nothing more
---
## 5. REFACTOR Phase Principles
### What to Improve
| Area | Action |
|------|--------|
…
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