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Looks like the below testcase supposed to send an update with a wrong header and check the response. But the Update a DNS Rule with invalid etag just set the headers, not sending the PUT request.

TC_MEC_SRV_DNS_003_PF
    [Documentation]
    ...    Check that the IUT responds with an error when
    ...    a request sent by a MEC Application doesn't comply with a required condition
    ...
    ...    Reference    ETSI GS MEC 011 V2.0.9, clause 7.2.10.3.2
    ...    OpenAPI    https://forge.etsi.org/rep/mec/gs011-app-enablement-api/blob/v2.0.9/MecAppSupportApi.yaml#/definitions/DnsRule

    [Tags]    PIC_MEC_PLAT    PIC_SERVICES
    Update a DNS Rule with invalid etag    ${APP_INSTANCE_ID}    ${DNS_RULE_ID}    DnsRuleUpdate
    Check HTTP Response Status Code Is    412

Update a DNS Rule with invalid etag
    [Arguments]    ${appInstanceId}    ${dnsRuleId}    ${content}
    Set Headers    {"If-Match": ${INVALID_ETAG}}