fix(D010_01_aux): JSON-serialise stub body (HttpCtrl does not auto-encode dicts)

    [Tags]    since_v1.6.1    dist-ops    4_3_3    cf_06    additive-auxiliary    4_3_6_2    5_7_1

    ${entity_body}=    Load Entity    ${entity_payload_filename}    ${entity_id}

    ${entity_fragment}=    Load JSON From File    ${EXECDIR}/data/entities/fragmentEntities/${fragment_filename}

    Set Stub Reply    GET    /ngsi-ld/v1/entities/${entity_id}    200    ${entity_body}

    # `Load Entity` returns a Python dict; HttpCtrl's `Set Stub Reply` writes

    # the body argument verbatim and does NOT auto-serialise non-string values

    # (a dict passed straight in: `len(dict)` reports the key count for the

    # Content-Length header, and `wfile.write(dict)` raises silently — the

    # mock ends up sending headers only). Serialise to a JSON string first.

    ${entity_body_json}=    Evaluate    json.dumps($entity_body)    json

    Set Stub Reply    GET    /ngsi-ld/v1/entities/${entity_id}    200    ${entity_body_json}

    ${response}=    Retrieve Entity    ${entity_id}    context=${ngsild_test_suite_context}

    Check Response Status Code    200    ${response.status_code}