# `TF009` Validating YAMLs

Without generating any output, we validate that the YAMLs conform to the expected schema

:::{dropdown} Is a test for
:open: 
:icon: check-circle-fill
:color: primary

[`SF012` YAML validation](/requirements/SF012)
:::

## Initial state
The [uv](https://docs.astral.sh/uv/getting-started/installation/) tool and curl are required.

The expected state is the final state of
[`TF004` Add comments](/tests/TF004)
## Procedure
### Step 1
Install Yamale
```console
$ uv tool install yamale
[...]
Installed 1 executable: yamale

```
### Step 2
Obtain the schema
```console
$ curl --pogress-bar -O https://raw.githubusercontent.com/agagniere/speky/refs/heads/master/schema.yaml

#[...]# 100.0%
```
### Step 3
Run Yamale on the YAMLs
```console
$ yamale -s schema.yaml specs.yaml tests.yaml comments.yaml
Validating specs.yaml...
Validating tests.yaml...
Validating comments.yaml...
Validation success! 👍

```