Check same request name behaviour

I believe the following will silently overwrite the first request and run only once:

```
document:
url: ${api_url}/v1/contract/${contract_list[0].id}/document
method: POST
headers:
Authorization: Bearer ${login.access_token}
body:
json:
filename: vbox.png
index: 8
validation:
status: 201

document:
url: ${api_url}/v1/contract/${contract_list[0].id}/document
method: POST
headers:
Authorization: Bearer ${login.access_token}
body:
json:
filename: vbox.png
index: 9
validation:
status: 201
```

This must fail or at least warn about the duplicate key.