diff --git a/R/colors.R b/R/colors.R
index 97e6fa4..2ba4f69 100644
--- a/R/colors.R
+++ b/R/colors.R
@@ -38,7 +38,7 @@ get_groups <- function(ax) {
   if (!inherits(ax, "apexcharter"))
     stop("ax must be an apexcharter htmlwidget")
   if (is.null(ax$x$ax_opts$series))
-    stop("ax must have a series of data")
+    stop("ax must have a serie of data")
   groups <- lapply(ax$x$ax_opts$series, `[[`, "name")
   groups <- unlist(groups)
   as.character(groups)
diff --git a/R/onLoad.R b/R/onLoad.R
index a5bafda..d9c0ea9 100644
--- a/R/onLoad.R
+++ b/R/onLoad.R
@@ -1,6 +1,6 @@
 
 #' @importFrom shiny registerInputHandler
-.onLoad <- function(...) {
+.onLoad <- function(...) { # nocov start
   shiny::registerInputHandler("apex_click", function(data, ...) {
     if (is.null(data)) {
       NULL
@@ -37,4 +37,4 @@
   }, force = TRUE)
   register_s3_method("knitr", "knit_print", "apex_facet")
   register_s3_method("knitr", "knit_print", "apex_grid")
-}
+} # nocov end
diff --git a/R/shiny-input.R b/R/shiny-input.R
index 1dbeaee..54be0f4 100644
--- a/R/shiny-input.R
+++ b/R/shiny-input.R
@@ -180,14 +180,14 @@ set_input_selection <- function(ax, inputId, type = c("x", "xy", "y"),
 #'
 #' @example examples/export-2.R
 set_input_export <- function(ax, inputId,
-                             session = shiny::getDefaultReactiveDomain()) {
+                             session = shiny::getDefaultReactiveDomain()) { # nocov start
   if (is.null(session))
     session <- list(ns = identity)
   ax$x$shinyEvents$export <- list(
     inputId = session$ns(inputId)
   )
   ax
-}
+} # nocov end
 
 
 
@@ -196,7 +196,7 @@ set_input_export <- function(ax, inputId,
 
 # Demo --------------------------------------------------------------------
 
-
+# nocov start
 
 #' Run Shiny input events examples
 #'
@@ -214,7 +214,7 @@ set_input_export <- function(ax, inputId,
 #'   run_demo_input("selection")
 #' 
 #' }
-run_demo_input <- function(example = c("click", "zoom", "selection")) {
+run_demo_input <- function(example = c("click", "zoom", "selection")) { 
   example <- match.arg(example)
   shiny::shinyAppFile(
     appFile = system.file("examples-input", example, "app.R", package = "apexcharter"),
@@ -264,3 +264,4 @@ run_demo_sparkbox <- function() {
   )
 }
 
+# nocov end
diff --git a/tests/testthat/test-apex.R b/tests/testthat/test-apex.R
index b9b7175..a1e7a37 100644
--- a/tests/testthat/test-apex.R
+++ b/tests/testthat/test-apex.R
@@ -22,6 +22,39 @@ test_that("apex works", {
   expect_is(pie, "apexcharter")
   expect_identical(pie$x$ax_opts$chart$type, "pie")
   expect_false(is.null(pie$x$ax_opts$series))
+  
+  candlestick <- apex(
+    candles, 
+    aes(x = datetime, open = open, close = close, low = low, high = high),
+    type = "candlestick"
+  )
+  expect_is(candlestick, "apexcharter")
+  expect_identical(candlestick$x$ax_opts$chart$type, "candlestick")
+  expect_false(is.null(candlestick$x$ax_opts$series))
+  
+  tl <- data.frame(
+    x = month.abb,
+    start = Sys.Date() + 1:12,
+    end = Sys.Date() + 1:12 * 3
+  )
+  timeline <- apex(tl, aes(x = x, start = start, end = end), "timeline")
+  expect_is(timeline, "apexcharter")
+  expect_identical(timeline$x$ax_opts$chart$type, "rangeBar")
+  expect_false(is.null(timeline$x$ax_opts$series))
+  
+  
+  hm <- expand.grid(year = 2000:2010, month = month.name)
+  hm$value <- sample.int(1e4, nrow(hm))
+  heatmap <- apex(
+    data = hm,
+    type = "heatmap", 
+    mapping = aes(x = year, y = month, fill = value)
+  ) %>% 
+    ax_dataLabels(enabled = FALSE) %>% 
+    ax_colors("#008FFB")
+  expect_is(heatmap, "apexcharter")
+  expect_identical(heatmap$x$ax_opts$chart$type, "heatmap")
+  expect_false(is.null(heatmap$x$ax_opts$series))
 })
 
 
@@ -93,3 +126,14 @@ test_that("make_series works with group (mtcars)", {
     as.list(unlist(tapply(mapdata$fill, factor(mapdata$fill, levels = unique(mapdata$fill)), length, simplify = FALSE), use.names = FALSE))
   )
 })
+
+
+
+test_that("compute count", {
+  ax <- apex(data = mtcars, type = "column", mapping = aes(x = vs))
+  expect_is(ax, "apex")
+  
+  ax <- apex(data = mtcars, type = "column", mapping = aes(x = vs, fill = gear))
+  expect_is(ax, "apex")
+})
+
diff --git a/tests/testthat/test-colors.R b/tests/testthat/test-colors.R
new file mode 100644
index 0000000..49a36ea
--- /dev/null
+++ b/tests/testthat/test-colors.R
@@ -0,0 +1,25 @@
+test_that("ax_colors_manual works", {
+  ax1 <- apex(
+    data = mtcars, 
+    type = "scatter",
+    mapping = aes(x = wt, y = mpg, fill = cyl)
+  ) %>% 
+    ax_colors_manual(list(
+      "4" = "steelblue",
+      "6" = "firebrick",
+      "8" = "forestgreen"
+    ))
+  ax2 <- apex(
+    data = mtcars, 
+    type = "scatter",
+    mapping = aes(x = wt, y = mpg, fill = cyl)
+  ) %>% 
+    ax_colors_manual(list(
+      "4" = "steelblue",
+      "8" = "forestgreen",
+      "6" = "firebrick"
+    ))
+  expect_is(ax1$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)
+})
diff --git a/tests/testthat/test-facets.R b/tests/testthat/test-facets.R
index 92f501e..d4002f2 100644
--- a/tests/testthat/test-facets.R
+++ b/tests/testthat/test-facets.R
@@ -126,3 +126,31 @@ test_that("ax_facet_grid works with row and col", {
 })
 
 
+test_that("complete_mapdata works", {
+  
+  cmd <- complete_mapdata(
+    mapdata = list(x = c("April", "June", "September"), y = 1:3),
+    mapall = list(x = month.name)
+  )
+  
+  expect_is(cmd, "list")
+  expect_length(cmd$x, 12)
+})
+
+test_that("complete_data works", {
+  
+  cd <- complete_data(
+    data = data.frame(
+      var1 = c("a", "a", "b", "b", "c"),
+      var2 = c("A", "B", "A", "C", "A"),
+      value = 1:5
+    ),
+    vars = c("var1", "var2"),
+    fill_var = "value",
+    fill_value = 0
+  )
+  
+  expect_is(cd, "data.frame")
+})
+
+
diff --git a/tests/testthat/test-proxy.R b/tests/testthat/test-proxy.R
new file mode 100644
index 0000000..67d9449
--- /dev/null
+++ b/tests/testthat/test-proxy.R
@@ -0,0 +1,68 @@
+test_that("apexchartProxy works", {
+  proxy <- apexchartProxy("chart", session = list(ns = identity))
+  
+  expect_is(proxy, "apexchart_Proxy")
+  
+  expect_error(apexchartProxy("chart", NULL))
+})
+
+
+test_that("ax_proxy_series works", {
+  
+  session <- as.environment(list(
+    ns = identity,
+    sendCustomMessage = function(type, message) {
+      session$lastCustomMessage = list(type = type, message = message)
+    }
+  ))
+  
+  proxy <- apexchartProxy("chart", session = session) %>% 
+    ax_proxy_series(1:10)
+  
+  expect_is(session$lastCustomMessage, "list")
+  expect_identical(session$lastCustomMessage$type, "update-apexchart-series")
+  expect_identical(session$lastCustomMessage$message$id, "chart")
+})
+
+
+test_that("ax_proxy_options works", {
+  
+  session <- as.environment(list(
+    ns = identity,
+    sendCustomMessage = function(type, message) {
+      session$lastCustomMessage = list(type = type, message = message)
+    }
+  ))
+  
+  proxy <- apexchartProxy("chart", session = session) %>% 
+    ax_proxy_options(list(
+      xaxis = list(
+        labels = list(show = TRUE)
+      ),
+      yaxis = list(
+        title = list(text = FALSE)
+      )
+    ))
+  
+  expect_is(session$lastCustomMessage, "list")
+  expect_identical(session$lastCustomMessage$type, "update-apexchart-options")
+  expect_identical(session$lastCustomMessage$message$id, "chart")
+})
+
+
+test_that("ax_proxy_toggle_series works", {
+  
+  session <- as.environment(list(
+    ns = identity,
+    sendCustomMessage = function(type, message) {
+      session$lastCustomMessage = list(type = type, message = message)
+    }
+  ))
+  
+  proxy <- apexchartProxy("chart", session = session) %>% 
+    ax_proxy_toggle_series("serie1")
+  
+  expect_is(session$lastCustomMessage, "list")
+  expect_identical(session$lastCustomMessage$type, "update-apexchart-toggle-series")
+  expect_identical(session$lastCustomMessage$message$id, "chart")
+})