diff --git a/tests/testthat/test-apex-utils.R b/tests/testthat/test-apex-utils.R
index d6ea6cc..54a211a 100644
--- a/tests/testthat/test-apex-utils.R
+++ b/tests/testthat/test-apex-utils.R
@@ -31,4 +31,17 @@ test_that("all apex utilities works", {
 })
 
 
+test_that("ax_nodata works", {
+  empty <- data.frame(
+    var1 = character(0),
+    var2 = numeric(0)
+  )
+  ax <- apex(empty, aes(var1, var2), "column") %>% 
+    ax_nodata(
+      text = "Sorry no data to visualize",
+      fontSize = "30px"
+    )
+  expect_is(ax, "apexcharter")
+  expect_is(ax$x$ax_opts$noData, "list")
+})
 
diff --git a/tests/testthat/test-colors.R b/tests/testthat/test-colors.R
index 49a36ea..4ebc644 100644
--- a/tests/testthat/test-colors.R
+++ b/tests/testthat/test-colors.R
@@ -22,4 +22,15 @@ test_that("ax_colors_manual works", {
   expect_is(ax1$x$ax_opts$colors, "list")
   expect_length(ax1$x$ax_opts$colors, 3)
   expect_identical(ax1$x$ax_opts$colors, ax2$x$ax_opts$colors)
+  
+  
+  ax <- apex(
+    data = mtcars, 
+    type = "scatter",
+    mapping = aes(x = wt, y = mpg, fill = cyl)
+  )
+  expect_error(ax_colors_manual(ax, c("red", "blue", "green")))
+  expect_error(ax_colors_manual(ax, c(a = "red", b = "blue", "green")))
+  expect_error(ax_colors_manual(apexchart(), list(a = "red", b = "blue", b = "green")))
+  expect_error(ax_colors_manual(list(), list(a = "red", b = "blue", b = "green")))
 })
diff --git a/tests/testthat/test-facets.R b/tests/testthat/test-facets.R
index adea28d..ef34cac 100644
--- a/tests/testthat/test-facets.R
+++ b/tests/testthat/test-facets.R
@@ -127,7 +127,7 @@ test_that("ax_facet_grid works with row and col", {
 
 
 
-test_that("globla title and subtitle works", {
+test_that("global title and subtitle works", {
   
   ax <- apex(mtcars, aes(disp, wt), type = "scatter") %>% 
     ax_facet_grid(vars(cyl), vars(carb))
@@ -139,8 +139,8 @@ test_that("globla title and subtitle works", {
   
   ax <- ax  %>%
     ax_labs(
-      title = "Facet wrap example",
-      subtitle = "mpg data from ggplot2"
+      title = "this is a title",
+      subtitle = "this is a subtitle"
     )
   
   facet <- build_facets(ax)
@@ -155,6 +155,61 @@ test_that("globla title and subtitle works", {
 })
 
 
+test_that("axis title works (grid)", {
+  
+  ax <- apex(mtcars, aes(disp, wt), type = "scatter") %>% 
+    ax_facet_grid(vars(cyl), vars(carb))
+  
+  facet <- build_facets(ax)
+  expect_is(facet, "list")
+  expect_null(facet$xaxis_title)
+  expect_null(facet$yaxis_title)
+  
+  ax <- ax  %>%
+    ax_labs(
+      x = "x axis title",
+      y = "y axis title"
+    )
+  
+  facet <- build_facets(ax)
+  expect_is(facet, "list")
+  expect_is(facet$xaxis_title, "list")
+  expect_is(facet$yaxis_title, "list")
+  
+  TAG <- build_facet_tag(ax)
+  TAG <- htmltools::doRenderTags(TAG)
+  expect_true(grepl(pattern = "apexcharter-facet-yaxis-title", x = TAG))
+  expect_true(grepl(pattern = "apexcharter-facet-xaxis-title", x = TAG))
+})
+
+
+test_that("axis title works (wrap)", {
+  
+  ax <- apex(mtcars, aes(disp, wt), type = "scatter") %>% 
+    ax_facet_wrap(vars(cyl, carb))
+  
+  facet <- build_facets(ax)
+  expect_is(facet, "list")
+  expect_null(facet$xaxis_title)
+  expect_null(facet$yaxis_title)
+  
+  ax <- ax  %>%
+    ax_labs(
+      x = "x axis title",
+      y = "y axis title"
+    )
+  
+  facet <- build_facets(ax)
+  expect_is(facet, "list")
+  expect_is(facet$xaxis_title, "list")
+  expect_is(facet$yaxis_title, "list")
+  
+  TAG <- build_facet_tag(ax)
+  TAG <- htmltools::doRenderTags(TAG)
+  expect_true(grepl(pattern = "apexcharter-facet-yaxis-title", x = TAG))
+  expect_true(grepl(pattern = "apexcharter-facet-xaxis-title", x = TAG))
+})
+
 
 
 test_that("complete_mapdata works", {
diff --git a/tests/testthat/test-format.R b/tests/testthat/test-format.R
new file mode 100644
index 0000000..2277690
--- /dev/null
+++ b/tests/testthat/test-format.R
@@ -0,0 +1,5 @@
+test_that("multiplication works", {
+  fmt <- format_num("~s")
+  expect_is(fmt, "JS_EVAL")
+  expect_error(format_num(".0f", locale = "DONT_EXIST"))
+})
diff --git a/tests/testthat/test-mixed-charts.R b/tests/testthat/test-mixed-charts.R
index e93b487..239ad5f 100644
--- a/tests/testthat/test-mixed-charts.R
+++ b/tests/testthat/test-mixed-charts.R
@@ -1,3 +1,13 @@
+test_that("add_line only works with apex and certain type", {
+  
+  expect_error(apexchart() %>% add_line(aes(month, temperature)))
+  expect_error(apexchart() %>% add_smooth_line())
+  
+  expect_error(apex(mtcars, aes(x = cyl), type = "pie") %>% add_line(aes(month, temperature)))
+  expect_error(apex(mtcars, aes(x = cyl), type = "pie") %>% add_smooth_line())
+})
+
+
 test_that("add_line works with column chart", {
   
   ax <- apex(climate_paris, aes(month, precipitation), type = "column") %>% 
@@ -28,5 +38,12 @@ test_that("add_smooth_line works with scatter chart", {
   expect_is(ax, "apex")
   expect_is(ax$x$ax_opts$series, "list")
   expect_length(ax$x$ax_opts$series, 2)
+  
+  ax <- apex(cars, aes(speed, dist), type = "scatter") %>% 
+    add_smooth_line(model = "lm")
+  
+  expect_is(ax, "apex")
+  expect_is(ax$x$ax_opts$series, "list")
+  expect_length(ax$x$ax_opts$series, 2)
 })
 
diff --git a/tests/testthat/test-proxy.R b/tests/testthat/test-proxy.R
index 67d9449..d01725b 100644
--- a/tests/testthat/test-proxy.R
+++ b/tests/testthat/test-proxy.R
@@ -7,6 +7,35 @@ test_that("apexchartProxy works", {
 })
 
 
+test_that(".ax_proxy & .ax_proxy2  works", {
+  
+  session <- as.environment(list(
+    ns = identity,
+    sendCustomMessage = function(type, message) {
+      session$lastCustomMessage = list(type = type, message = message)
+    }
+  ))
+  
+  proxy <- apexchartProxy("chart", session = session) %>% 
+    .ax_proxy(name = "TEST", a = 1)
+  
+  expect_is(session$lastCustomMessage, "list")
+  expect_identical(session$lastCustomMessage$type, "update-apexchart-TEST")
+  expect_identical(session$lastCustomMessage$message$id, "chart")
+  
+  expect_error(.ax_proxy(apexchart(), name = "TEST", a = 1))
+  
+  proxy <- apexchartProxy("chart", session = session) %>% 
+    .ax_proxy2(name = "TEST", list(a = 1))
+  
+  expect_is(session$lastCustomMessage, "list")
+  expect_identical(session$lastCustomMessage$type, "update-apexchart-TEST")
+  expect_identical(session$lastCustomMessage$message$id, "chart")
+  
+  expect_error(.ax_proxy2(apexchart(), name = "TEST", a = 1))
+})
+
+
 test_that("ax_proxy_series works", {
   
   session <- as.environment(list(
diff --git a/tests/testthat/test-tooltip.R b/tests/testthat/test-tooltip.R
new file mode 100644
index 0000000..ca0a8c9
--- /dev/null
+++ b/tests/testthat/test-tooltip.R
@@ -0,0 +1,12 @@
+test_that("set_tooltip_fixed works", {
+  ax <- apex(
+    data = mtcars, 
+    mapping = aes(x = cyl),
+    type = "column"
+  ) %>% 
+    set_tooltip_fixed()
+  
+  expect_is(ax, "apex")
+  expect_is(ax$x$ax_opts$tooltip$fixed, "list")
+  expect_true(ax$x$ax_opts$tooltip$fixed$enabled)
+})