How to access attributes including headers, queryparams in Munit set Event processor. I am using Anypoint Studio 7.5 - mule4

Question

How to access attributes including headers, queryparams in Munit set Event processor. I am using Anypoint Studio 7.5
I have tried with <munit:attributes value="#[{headers : {'token' :'value1'}}]" encoding="UTF-16" /> but it didn't worked.
<sub-flow name="setUserAndPass">
<choice doc:name="Choice" >
<when expression='attributes."headers"."authorization" != null'>
<ee:transform doc:name="Transform Message" >
<ee:message >
</ee:message>
<ee:variables >
<ee:set-variable variableName="userAndPass" ><![CDATA[%dw 2.0
import * from dw::core::Binaries
output text/json
var auth = attributes."headers"."authorization"
---
(fromBase64((auth splitBy(" "))[1] as Binary)) splitBy(":")]]></ee:set-variable>
</ee:variables>
</ee:transform>
<set-variable value='#[vars.userAndPass[0]]' doc:name="Set lvUSERNAME Variable" variableName="lvUSERNAME"/>
<set-variable value='#[vars.userAndPass[1]]' doc:name="Set lvPASSWORD variable" variableName="lvPASSWORD "/>
</when>
<otherwise >
<set-variable value='#[attributes."headers"."username"]' doc:name="Set lvUSERNAME Variable" variableName="lvUSERNAME" />
<set-variable value='#[attributes."headers"."password"]' doc:name="Set lvPASSWORD Variable" variableName="lvPASSWORD" />
</otherwise>
</choice>
</sub-flow>
Munit Flow:
<munit:test name="appname-test-suite-setUserAndPassTest" description="Test">
<munit:behavior >
<munit:set-event doc:name="Set Event">
<munit:attributes value="#[
{
headers : {'authorization': 'authvalue'}
}]" />
</munit:set-event>
</munit:behavior>
<munit:execution >
<flow-ref doc:name="Flow-ref to setUserAndPass" name="setUserAndPass"/>
</munit:execution>
<munit:validation >
<munit-tools:assert-equals doc:name="Assert equals" actual="#[vars.lvUSERNAME]" expected="usernamevalue"/>
</munit:validation>
</munit:test>

Answer 1

It should like this:
<munit:set-event doc:name="Set Event">
<munit:payload value="#['..']" encoding="UTF-16" />
<munit:attributes value="#[
{
headers : {'token': 'value1'},
queryParams : {'queryParam1': 'value2'}
}]" encoding="UTF-16" />
</munit:set-event>