# Hello world

This is a test post. It checks how Hashnode renders a Mermaid diagram, a code block and headings on the free plan. It will be replaced by real writing.

## A diagram

```mermaid
flowchart LR
  A[Draft in the repo] --> B[Paste into Hashnode]
  B --> C[Published post]
```

## A code block

```python
def greet(name: str) -> str:
    return f"Hello, {name}"
```

### A smaller heading

That is the whole test.