Shiny output doesn't run if no input?

server.R

library(shiny)
library(shinyIncubator)

options(shiny.reactlog=TRUE);

shinyServer(function(input, output,session) {
  output$test <- renderPlot({
    input$meh
    print("wassup")
    withProgress(session, min=1, max=15, {
      setProgress(message = 'Calculation in progress', detail = 'This may take a while...')
      for (i in 1:15) {
        print(i)
        setProgress(value = i)
        Sys.sleep(0.5)
      }
    })
    plot(1,1)
  })
  
  #outputOptions(output, 'test', suspendWhenHidden=FALSE)
  #outputOptions(output, 'test1', suspendWhenHidden=FALSE)
  
})

ui.R

library(shinyIncubator)
shinyUI(pageWithSidebar(
  headerPanel("Shiny Text"),
  sidebarPanel(),
  
  # Show the caption and plot of the requested variable against mpg
  mainPanel(
    actionButton("id","meh"),
    tabsetPanel(
      tabPanel("test1",plotOutput("test"),
               progressInit()),
     
      tabPanel("test2",plotOutput("test1"))
    )
  )
))