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title: MUnit Fail Event Processor
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# MUnit Fail Event Processor

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

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The MUnit Fail event processor forces a MUnit test to fail at a specific point in the flow, which is
useful for validating that certain code paths are never reached. Use it to catch unexpected
execution paths during testing.

```xml
<munit-tools:fail
  message="This should fail"/>
```

The message field is optional and defines the error message to print when the assertion fails. The
processor throws a `MUNIT-TOOLS:ASSERTION_ERROR`.