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custom_components/hacs/validate/README.md

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+# Repository validation
+
+This is where the validation rules that run against the various repository categories live.
+
+## Structure
+
+- There is one file pr. rule.
+- All rule needs tests to verify every possible outcome for the rule.
+- It's better with multiple files than a big rule.
+- All rules uses `ActionValidationBase` as the base class.
+- Only use `validate` or `async_validate` methods to define validation rules.
+- If a rule should fail, raise `ValidationException` with the failure message.
+
+
+## Example
+
+```python
+from .base import (
+    ActionValidationBase,
+    ValidationBase,
+    ValidationException,
+)
+
+class SuperAwesomeRepository(ActionValidationBase):
+    category = "integration"
+
+    async def async_validate(self):
+        if self.repository != "super-awesome":
+            raise ValidationException("The repository is not super-awesome")
+```