diff --git a/tests/testthat/test-shinytest2-tm_t_summary_by.R b/tests/testthat/test-shinytest2-tm_t_summary_by.R
new file mode 100644
index 000000000..fc1f08596
--- /dev/null
+++ b/tests/testthat/test-shinytest2-tm_t_summary_by.R
@@ -0,0 +1,216 @@
+app_driver_tm_t_summary_by <- function() {
+  data <- teal.data::teal_data()
+  data <- within(data, {
+    ADSL <- teal.data::rADSL
+    ADLB <- teal.data::rADLB
+  })
+
+  datanames <- c("ADSL", "ADLB")
+  teal.data::datanames(data) <- datanames
+  teal.data::join_keys(data) <- teal.data::default_cdisc_join_keys[datanames]
+
+  init_teal_app_driver(
+    data = data,
+    modules = tm_t_summary_by(
+      label = "Summary by Row Groups Table",
+      dataname = "ADLB",
+      parentname = "ADSL",
+      arm_var = teal.transform::choices_selected(
+        choices = teal.transform::variable_choices(data[["ADSL"]], c("ARM", "ARMCD")),
+        selected = "ARM"
+      ),
+      add_total = TRUE,
+      by_vars = teal.transform::choices_selected(
+        choices = teal.transform::variable_choices(data[["ADLB"]], c("PARAM", "AVISIT")),
+        selected = c("AVISIT")
+      ),
+      summarize_vars = teal.transform::choices_selected(
+        choices = teal.transform::variable_choices(data[["ADLB"]], c("AVAL", "CHG")),
+        selected = c("AVAL")
+      ),
+      useNA = "ifany",
+      paramcd = teal.transform::choices_selected(
+        choices = teal.transform::value_choices(data[["ADLB"]], "PARAMCD", "PARAM"),
+        selected = "ALT"
+      ),
+      id_var = teal.transform::choices_selected(
+        teal.transform::variable_choices(data[["ADLB"]], subset = "USUBJID"),
+        selected = "USUBJID", fixed = TRUE
+      ),
+      total_label = default_total_label(),
+      parallel_vars = FALSE,
+      row_groups = FALSE,
+      na_level = default_na_str(),
+      numeric_stats = c("n", "mean_sd", "median", "range"),
+      denominator = teal.transform::choices_selected(c("n", "N", "omit"), "omit",
+        fixed = TRUE
+      ),
+      drop_arm_levels = TRUE,
+      drop_zero_levels = TRUE,
+      pre_output = NULL,
+      post_output = NULL,
+      basic_table_args = teal.widgets::basic_table_args()
+    )
+  )
+}
+
+testthat::test_that("e2e - tm_t_summary_by: Module initializes in teal without errors and produces table output.", {
+  skip_if_too_deep(5)
+  app_driver <- app_driver_tm_t_summary_by()
+  app_driver$expect_no_shiny_error()
+  app_driver$expect_no_validation_error()
+  testthat::expect_true(
+    app_driver$is_visible(app_driver$active_module_element("table-table-with-settings"))
+  )
+  app_driver$stop()
+})
+
+testthat::test_that(
+  "e2e - tm_t_summary_by: Starts with specified label, arm_var, paramcd, by_vars, summarize_vars,
+  useNA, numeric_stats, add_total, parallel_vars, row_groups, drop_zero_levels.",
+  {
+    skip_if_too_deep(5)
+    app_driver <- app_driver_tm_t_summary_by()
+    testthat::expect_equal(
+      app_driver$get_text("#teal-main_ui-root-active_tab > li.active > a"),
+      "Summary by Row Groups Table"
+    )
+    testthat::expect_equal(
+      app_driver$get_active_module_input("arm_var-dataset_ADSL_singleextract-select"),
+      "ARM"
+    )
+    testthat::expect_equal(
+      app_driver$get_active_module_input("paramcd-dataset_ADLB_singleextract-filter1-vals"),
+      "ALT"
+    )
+    testthat::expect_equal(
+      app_driver$get_active_module_input("by_vars-dataset_ADLB_singleextract-select"),
+      "AVISIT"
+    )
+    testthat::expect_equal(
+      app_driver$get_active_module_input("summarize_vars-dataset_ADLB_singleextract-select"),
+      "AVAL"
+    )
+    testthat::expect_equal(
+      app_driver$get_active_module_input("useNA"),
+      "ifany"
+    )
+    testthat::expect_equal(
+      app_driver$get_active_module_input("numeric_stats"),
+      c("n", "mean_sd", "median", "range")
+    )
+    testthat::expect_true(app_driver$get_active_module_input("add_total"))
+    testthat::expect_false(app_driver$get_active_module_input("parallel_vars"))
+    testthat::expect_false(app_driver$get_active_module_input("row_groups"))
+    testthat::expect_true(app_driver$get_active_module_input("drop_zero_levels"))
+    app_driver$stop()
+  }
+)
+
+testthat::test_that(
+  "e2e - tm_t_summary_by: Selecting arm_var-variable changes the table and does not throw validation errors.",
+  {
+    skip_if_too_deep(5)
+    app_driver <- app_driver_tm_t_summary_by()
+    table_before <- app_driver$get_active_module_tws_output("table")
+    app_driver$set_active_module_input("arm_var-dataset_ADSL_singleextract-select", "ARMCD")
+    testthat::expect_false(identical(table_before, app_driver$get_active_module_tws_output("table")))
+    app_driver$expect_no_validation_error()
+    app_driver$stop()
+  }
+)
+
+testthat::test_that("e2e - tm_t_summary_by: Deselection of arm_var-variable throws validation error.", {
+  skip_if_too_deep(5)
+  app_driver <- app_driver_tm_t_summary_by()
+  app_driver$set_active_module_input("arm_var-dataset_ADSL_singleextract-select", NULL)
+  testthat::expect_identical(app_driver$get_active_module_tws_output("table"), data.frame())
+  app_driver$expect_validation_error()
+  testthat::expect_equal(
+    app_driver$active_module_element_text("arm_var-dataset_ADSL_singleextract-select_input .shiny-validation-message"),
+    "Please select 1 or 2 column variables"
+  )
+  app_driver$stop()
+})
+
+testthat::test_that(
+  "e2e - tm_t_summary_by: Selecting arm_var-variable changes the table and does not throw validation errors.",
+  {
+    skip_if_too_deep(5)
+    app_driver <- app_driver_tm_t_summary_by()
+    table_before <- app_driver$get_active_module_tws_output("table")
+    app_driver$set_active_module_input("paramcd-dataset_ADLB_singleextract-filter1-vals", "CRP")
+    testthat::expect_false(identical(table_before, app_driver$get_active_module_tws_output("table")))
+    app_driver$expect_no_validation_error()
+    app_driver$stop()
+  }
+)
+
+testthat::test_that("e2e - tm_t_summary_by: Deselection of arm_var-variable throws validation error.", {
+  skip_if_too_deep(5)
+  app_driver <- app_driver_tm_t_summary_by()
+  app_driver$set_active_module_input("paramcd-dataset_ADLB_singleextract-filter1-vals", NULL)
+  testthat::expect_identical(app_driver$get_active_module_tws_output("table"), data.frame())
+  app_driver$expect_validation_error()
+  testthat::expect_equal(
+    app_driver$active_module_element_text(
+      "paramcd-dataset_ADLB_singleextract-filter1-vals_input .shiny-validation-message"
+    ),
+    "Please select a filter."
+  )
+  app_driver$stop()
+})
+
+testthat::test_that(
+  "e2e - tm_t_summary_by: Selecting arm_var-variable changes the table and does not throw validation errors.",
+  {
+    skip_if_too_deep(5)
+    app_driver <- app_driver_tm_t_summary_by()
+    table_before <- app_driver$get_active_module_tws_output("table")
+    app_driver$set_active_module_input("by_vars-dataset_ADLB_singleextract-select", "PARAM")
+    testthat::expect_false(identical(table_before, app_driver$get_active_module_tws_output("table")))
+    app_driver$expect_no_validation_error()
+    app_driver$stop()
+  }
+)
+
+testthat::test_that(
+  "e2e - tm_t_summary_by: Deselection of arm_var-variable changes the table and does not throw validation errors.",
+  {
+    skip_if_too_deep(5)
+    app_driver <- app_driver_tm_t_summary_by()
+    table_before <- app_driver$get_active_module_tws_output("table")
+    app_driver$set_active_module_input("by_vars-dataset_ADLB_singleextract-select", NULL)
+    testthat::expect_false(identical(table_before, app_driver$get_active_module_tws_output("table")))
+    app_driver$expect_no_validation_error()
+    app_driver$stop()
+  }
+)
+
+testthat::test_that(
+  "e2e - tm_t_summary_by: Selecting summarize_vars-variable changes the table and does not throw validation errors.",
+  {
+    skip_if_too_deep(5)
+    app_driver <- app_driver_tm_t_summary_by()
+    table_before <- app_driver$get_active_module_tws_output("table")
+    app_driver$set_active_module_input("summarize_vars-dataset_ADLB_singleextract-select", "CHG")
+    testthat::expect_false(identical(table_before, app_driver$get_active_module_tws_output("table")))
+    app_driver$expect_no_validation_error()
+    app_driver$stop()
+  }
+)
+
+testthat::test_that("e2e - tm_t_summary_by: Deselection of summarize_vars-variable throws validation error.", {
+  skip_if_too_deep(5)
+  app_driver <- app_driver_tm_t_summary_by()
+  app_driver$set_active_module_input("summarize_vars-dataset_ADLB_singleextract-select", NULL)
+  testthat::expect_identical(app_driver$get_active_module_tws_output("table"), data.frame())
+  app_driver$expect_validation_error()
+  testthat::expect_equal(
+    app_driver$active_module_element_text(
+      "summarize_vars-dataset_ADLB_singleextract-select_input .shiny-validation-message"
+    ),
+    "Please select a summarize variable."
+  )
+  app_driver$stop()
+})