tests: Add 317-nav-insert

inst/apps/317-nav-insert/app.R

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+library(shiny)
+library(bslib)
+
+DO_ALERT <- FALSE
+
+action_choices <- c(
+  "Singleton script" = "singleton",
+  "Scripts with singleton" = "scripts",
+  "HTML Widget" = "htmlwidgets",
+  "Input/Output (content)" = "input_output_content",
+  "Input/Output (nav)" = "input_output_nav",
+  "Shiny sub-app" = "subapp"
+)
+
+ui <- page_navbar(
+  title = "Reprex for #4179",
+  id = "main",
+  lang = "en",
+  navbar_options = navbar_options(collapsible = FALSE),
+  footer = absolutePanel(
+    card(
+      selectInput("insert_type", "Insert nav type", choices = action_choices),
+      actionButton("do_insert", "Insert Nav"),
+      HTML(
+        '<p>Scripts: <span id="script-count">0</span> evaluated (<span id="script-count-expected">0</span> expected).'
+      ),
+      tags$script(
+        HTML(
+          "Shiny.addCustomMessageHandler('script-count-expected', function(value) {
+            const exp = document.getElementById('script-count-expected')
+            exp.textContent = +exp.textContent + value;
+          })"
+        )
+      )
+    ),
+    bottom = "1rem",
+    right = "1rem",
+    draggable = TRUE
+  )
+)
+
+# https://github.com/rstudio/shiny/pull/1794#issuecomment-318722200
+# We need these test cases for anywhere we insert dynamic UI:
+
+# 1. `<script>` blocks should run
+# 2. `<script>` blocks should only run once
+# 3. `head()`/`singleton()` should be respected
+# 4. HTML widgets should work
+# 	a. Even when the dependencies are not part of the initial page load
+# 5. Shiny inputs/outputs should work
+# 6. Subapps should work (include a `shinyApp` object right in the UI)
+
+action_link <- shiny::actionLink("refresh", "Refresh")
+
+script_hello_world <- local({
+  i <- 0
+
+  function() {
+    i <<- i + 1
+
+    shiny::HTML(
+      "<script>(function() {
+        const el = document.getElementById('script-count')
+        el.textContent = +el.textContent + 1
+      })()</script>"
+    )
+  }
+})
+
+script_singleton <- shiny::singleton(script_hello_world())
+
+singleton_has_run <- FALSE
+
+nav_insert_singleton <- function(session) {
+  if (!singleton_has_run) {
+    session$sendCustomMessage('script-count-expected', 1L)
+    singleton_has_run <<- TRUE
+  }
+
+  nav_insert(
+    id = "main",
+    select = TRUE,
+    nav_panel(
+      "One",
+      p("Script should only run the first time this nav is inserted."),
+      # 1. script blocks should run
+      script_singleton,
+      # 3. head() should be respected
+      tags$head(tags$meta(content = "shiny-test-head"))
+    ),
+  )
+}
+
+nav_insert_scripts <- function(session) {
+  session$sendCustomMessage('script-count-expected', 2L)
+
+  nav_insert(
+    id = "main",
+    select = TRUE,
+    nav_panel(
+      value = "Two",
+      tagList(
+        "Two",
+        script_hello_world(),
+      ),
+      p(
+        "Two scripts should run every time this nav is inserted."
+      ),
+      # 2. script blocks should only run once
+      script_hello_world()
+    ),
+  )
+}
+
+nav_insert_htmlwidget <- local({
+  widget_count <- 0
+  function() {
+    widget_count <<- widget_count + 1
+    # 4. htmlwidgets work even if not part of initial page load
+    nav_insert(
+      id = "main",
+      select = TRUE,
+      nav_panel(
+        "Map",
+        leaflet::addTiles(
+          leaflet::leaflet(
+            elementId = sprintf("leaflet-%d", widget_count)
+          )
+        )
+      ),
+    )
+  }
+})
+
+nav_insert_input_output_content <- function(input, output) {
+  # 5. Input/outputs should work (in content)
+  nav_insert(
+    id = "main",
+    select = TRUE,
+    nav_panel(
+      "Inputs/outputs",
+      layout_columns(
+        actionButton("btn", "Click me"),
+        sliderInput("slider", "Slide me", min = 0, max = 10, value = 2),
+      ),
+      verbatimTextOutput("debug")
+    )
+  )
+
+  output$debug <- renderPrint({
+    list(
+      btn = input$btn,
+      slider = input$slider,
+      nav_link = input$nav_link
+    )
+  })
+}
+
+nav_insert_input_output_nav <- function(input, output) {
+  # 5. Inputs/outputs work (in navbar)
+  nav_insert(
+    id = "main",
+    nav_item(
+      actionLink("nav_link", "Click me too", class = "nav-link")
+    )
+  )
+
+  nav_insert(
+    id = "main",
+    nav_item(textOutput("nav_output"))
+  )
+
+  output$nav_output <- renderText({
+    sprintf("Clicked %d times", input$nav_link)
+  })
+}
+
+nav_insert_subapp <- function() {
+  # 6. Shiny subapps
+  nav_insert(
+    id = "main",
+    select = TRUE,
+    nav_panel(
+      "Shiny app",
+      p("There should be another shiny app in here."),
+      shinyApp(
+        ui = page_fluid(
+          theme = bs_theme(preset = "darkly"),
+          titlePanel("Hello from in here!"),
+          p("This is a sub-app. Notice we're re-using the btn id."),
+          actionButton("btn", "Click me"),
+          verbatimTextOutput("debug")
+        ),
+        server = function(input, output, session) {
+          output$debug <- renderPrint(list(btn = input$btn))
+        }
+      )
+    )
+  )
+}
+
+server <- function(input, output, session) {
+  choices <- reactiveVal(action_choices)
+
+  observe({
+    updateSelectInput(
+      session,
+      "insert_type",
+      choices = choices(),
+      selected = input$insert_type
+    )
+  })
+
+  observeEvent(input$do_insert, {
+    one_time_choice <- FALSE
+
+    switch(
+      input$insert_type,
+      "singleton" = nav_insert_singleton(session),
+      "scripts" = nav_insert_scripts(session),
+      "htmlwidgets" = nav_insert_htmlwidget(),
+      "input_output_content" = {
+        one_time_choice <- TRUE
+        nav_insert_input_output_content(input, output)
+      },
+      "input_output_nav" = {
+        one_time_choice <- TRUE
+        nav_insert_input_output_nav(input, output)
+      },
+      "subapp" = nav_insert_subapp()
+    )
+
+    if (one_time_choice) {
+      choices(choices()[choices() != input$insert_type])
+    }
+  })
+}
+
+shinyApp(ui, server)

inst/apps/317-nav-insert/tests/testthat.R

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+shinytest2::test_app()

inst/apps/317-nav-insert/tests/testthat/setup-shinytest2.R

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+# Load application support files into testing environment
+shinytest2::load_app_env()
+