About Assert That Event Processor
The Assert That Event Processor allows you to run assertions in order to validate the state of a Mule Event’s content.
This Event Processor can be used to validate the Mule Event after the production code runs.
For example, to assert that a payload is equal to a certain value, you can configure the Assert-That processor using the equalTo() matcher.
<munit-tools:assert-that expression="#[payload]" is="#[MunitTools::equalTo('example')]" message="The payload should be ‘example’"/>
Or you can also check if the payload is null using the nullValue() matcher.
<munit-tools:assert-that expression="#[payload]" is="#[MunitTools::nullValue()]" message="The payload is null"/>
If these assertion fails, the processor throws a