Plug test messing up body request

Questions & Help Questions
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4

I tried out encoding the body as json as @al2o3cr pointed out, I dont know why it works because Plug test docs says the maps are accepted (as I already said too)
this worked for me

  test "POST /api/create_contract com dados válidos" do
    body = Jason.encode!(%{
      "chain" => "1",
      "coin" => "ETH",
      "transaction_value" => 2,
      "transaction_charged" => 6.78,
      "ref" => "REF123",
      "ref_fee" => 2.0,
      "payload" => "data_payload"
    })

    conn = conn(:post, "/api/create_contract", body)
    |> put_req_header("content-type", "application/json")
    |> TestesPay.MyRouter.call(body)
    
    IO.inspect(conn, label: "Connection after MyRouter.call")
    IO.inspect(conn.resp_body, label: "body response")
    assert conn.status == 200
  end