diff --git a/tests/testthat/test-adtteSpec.R b/tests/testthat/test-adtteSpec.R
index daca5253..ca781c65 100644
--- a/tests/testthat/test-adtteSpec.R
+++ b/tests/testthat/test-adtteSpec.R
@@ -239,6 +239,8 @@ test_that("adtteSpecServer module works as expected in the test app", {
   app$wait_for_idle()
   res <- app$get_value(output = ns("summary"))
   expect_equal(res$message, "please select an endpoint")
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-assaySpec.R b/tests/testthat/test-assaySpec.R
index 6ca03fce..99000475 100644
--- a/tests/testthat/test-assaySpec.R
+++ b/tests/testthat/test-assaySpec.R
@@ -58,6 +58,8 @@ test_that("assaySpecServer module works as expected in the test app", {
   app$wait_for_idle()
   res <- app$get_value(output = ns("result"))
   expect_identical(res, "[1] \"\"")
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-barplot.R b/tests/testthat/test-barplot.R
index b0cebb0d..7f29ccb7 100644
--- a/tests/testthat/test-barplot.R
+++ b/tests/testthat/test-barplot.R
@@ -90,6 +90,8 @@ test_that("barplot module works as expected in the test app", {
 
   app$wait_for_idle()
   app$expect_select_screenshot(ns("plot-plot_out_main"))
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-boxplot.R b/tests/testthat/test-boxplot.R
index f7a7f5d1..81533782 100644
--- a/tests/testthat/test-boxplot.R
+++ b/tests/testthat/test-boxplot.R
@@ -60,6 +60,8 @@ test_that("boxplot module works as expected in the test app", {
   app$wait_for_idle()
 
   app$expect_select_screenshot(ns("plot-plot_out_main"))
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-experimentSpec.R b/tests/testthat/test-experimentSpec.R
index 5c408b4d..427fee0e 100644
--- a/tests/testthat/test-experimentSpec.R
+++ b/tests/testthat/test-experimentSpec.R
@@ -195,6 +195,8 @@ test_that("experimentSpec module works as expected in the test app", {
 
   res <- app$get_value(output = ns("summary"))
   expect_match(res, "HermesData object with 9 samples of 2500 genes")
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-forest.R b/tests/testthat/test-forest.R
index abd0fff0..f9b666f0 100644
--- a/tests/testthat/test-forest.R
+++ b/tests/testthat/test-forest.R
@@ -62,6 +62,8 @@ test_that("forest_tte module works as expected in the test app", {
 
   app$wait_for_idle()
   app$expect_select_screenshot(ns("plot-plot_out_main"))
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-geneSpec.R b/tests/testthat/test-geneSpec.R
index f7334c70..f59e9e89 100644
--- a/tests/testthat/test-geneSpec.R
+++ b/tests/testthat/test-geneSpec.R
@@ -125,6 +125,8 @@ test_that("geneSpec module works as expected in the test app", {
   app$wait_for_idle()
   res <- app$get_value(input = ns("my_genes-genes"))
   expect_set_equal(res, c("GeneID:10061", "GeneID:28"))
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-km.R b/tests/testthat/test-km.R
index d9e34f75..38e1d47f 100644
--- a/tests/testthat/test-km.R
+++ b/tests/testthat/test-km.R
@@ -61,6 +61,7 @@ test_that("km module works as expected in the test app", {
   app$wait_for_idle()
 
   app$expect_select_screenshot(ns("plot-plot_out_main"))
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-pca.R b/tests/testthat/test-pca.R
index 405d2360..ef84a510 100644
--- a/tests/testthat/test-pca.R
+++ b/tests/testthat/test-pca.R
@@ -216,6 +216,7 @@ test_that("pca module works as expected in the test app", {
   app$set_inputs(!!ns("filter_top") := "TRUE")
   res <- app$wait_for_value(input = ns("n_top"))
   expect_identical(res, 2500L)
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-quality.R b/tests/testthat/test-quality.R
index 74b2f79d..4c334739 100644
--- a/tests/testthat/test-quality.R
+++ b/tests/testthat/test-quality.R
@@ -68,6 +68,7 @@ test_that("quality module works as expected in the test app", {
   app$set_inputs(!!ns("plot_type") := "Top Genes Plot")
   app$set_inputs(!!ns("assay-name") := "cpm")
   app$expect_select_screenshot(ns("plot-plot_out_main"))
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-sampleVarSpec.R b/tests/testthat/test-sampleVarSpec.R
index 4746074f..ce2b8ca7 100644
--- a/tests/testthat/test-sampleVarSpec.R
+++ b/tests/testthat/test-sampleVarSpec.R
@@ -220,6 +220,7 @@ test_that("sampleVarSpec module works as expected in the test app", {
   # Check the output and which levels are reported there.
   res <- app$get_value(output = ns("summary"))
   expect_match(res, "< 18/>= 18 \n         5 ")
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-scatterplot.R b/tests/testthat/test-scatterplot.R
index 53124350..beab64fb 100644
--- a/tests/testthat/test-scatterplot.R
+++ b/tests/testthat/test-scatterplot.R
@@ -91,6 +91,8 @@ test_that("scatterplot module works as expected in the test app", {
 
   app$wait_for_idle()
   app$expect_select_screenshot(ns("plot-plot_out_main"))
+
+  app$stop()
 })
 
 # nolint end
diff --git a/tests/testthat/test-volcanoplot.R b/tests/testthat/test-volcanoplot.R
index 0e36ad75..7bcca117 100644
--- a/tests/testthat/test-volcanoplot.R
+++ b/tests/testthat/test-volcanoplot.R
@@ -52,6 +52,7 @@ test_that("volcanoplot module works as expected in the test app", {
   app$set_inputs(!!ns("log2_fc_thresh") := 8)
 
   app$expect_select_screenshot(ns("plot-plot_out_main"))
+  app$stop()
 })
 
 # nolint end