503 shinytest2 for Show R code modal (#1146)

Part of insightsengineering/coredev-tasks#503

---------

Signed-off-by: Marcin <[email protected]>
Co-authored-by: André Veríssimo <[email protected]>
Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

tests/testthat/test-shinytest2-show-rcode.R

@@ -0,0 +1,54 @@
+testthat::test_that("e2e: teal app initializes with Show R Code modal", {
+  app <- TealAppDriver$new(
+    data = simple_teal_data(),
+    modules = example_module(label = "Example Module")
+  )
+  app$wait_for_idle(timeout = default_idle_timeout)
+
+  # Check if button exists.
+  button_selector <- app$active_module_element("rcode-button")
+  testthat::expect_equal(
+    app$get_text(button_selector),
+    "Show R code"
+  )
+
+  app$click(selector = button_selector)
+  app$wait_for_idle(timeout = default_idle_timeout)
+
+  # Check header and title content.
+  testthat::expect_equal(
+    app$get_text("#shiny-modal div.modal-header > h4"),
+    "Example Code"
+  )
+
+  # There are two Dismiss buttons with similar id and the same label.
+  testthat::expect_setequal(
+    testthat::expect_length(
+      app$get_text("#shiny-modal button[data-dismiss]"),
+      2
+    ),
+    "Dismiss"
+  )
+  # Check for Copy buttons.
+  testthat::expect_equal(
+    app$active_module_element("rcode-copy_button1") %>%
+      app$get_text(),
+    "Copy to Clipboard"
+  )
+  testthat::expect_equal(
+    app$active_module_element("rcode-copy_button2") %>%
+      app$get_text(),
+    "Copy to Clipboard"
+  )
+
+  # Check R code output.
+  r_code <-
+    app$active_module_element("rcode-verbatim_content") %>%
+    app$get_text()
+
+  testthat::expect_match(r_code, "# Add any code to install/load your NEST environment here", fixed = TRUE)
+  testthat::expect_match(r_code, "library(teal.code)", fixed = TRUE)
+  testthat::expect_match(r_code, "stopifnot(rlang::hash(", fixed = TRUE)
+
+  app$stop()
+})