Fix #101 - throw an error if the x argument supplied to vis_dat is not a data.frame

DESCRIPTION

@@ -13,7 +13,8 @@ Authors@R: c(
       comment = "Mara Averick reviewed the package for rOpenSci, see 
       https://github.com/ropensci/onboarding/issues/87"),
   person("Stuart", "Lee", role = c("ctb")),
-  person("Earo", "Wang", role = c("ctb"))
+  person("Earo", "Wang", role = c("ctb")),
+  person("Nic", "Crane", role = c("ctb"))
       )
 Description: Create preliminary exploratory data visualisations of an entire 
     dataset to identify problems or unexpected features using 'ggplot2'.

R/internals.R

@@ -265,3 +265,28 @@ all_numeric <- function(x, ...){
   all(as.logical(lapply(x, is.numeric)))
 }
 # Can I capture moving from a value to NA, or, from NA to another value?
+
+
+#' Test if input is a data.frame
+#'
+#' @param x object
+#'
+#' @return an error if input (x) is not a data.frame
+#'
+#' @examples
+#' \dontrun{
+#' # success
+#' test_if_dataframe(airquality)
+#' #fail
+#' test_if_dataframe(AirPassengers)
+#' }
+#'
+test_if_dataframe <- function(x){
+  if (!inherits(x, "data.frame")) {
+    stop("vis_dat requires a data.frame but the object I see has class/es: ",
+         paste(class(x), collapse = ", "), call.=FALSE)
+  }
+}
+
+
+

R/vis-compare.R

@@ -30,6 +30,12 @@ vis_compare <- function(df1,
   # make a TRUE/FALSE matrix of the data.
   # Tells us whether it is the same (true) as the other dataset, or not (false)
 
+  # throw error if df1 not data.frame
+  test_if_dataframe(df1)
+
+  # throw error if df2 not data.frame
+  test_if_dataframe(df2)
+
   if (!identical(dim(df1), dim(df2))) {
     stop("vis_compare requires identical dimensions of df1 and df2")
   }

R/vis-cor.R

@@ -28,6 +28,9 @@ vis_cor <- function(data,
                     na_action = "pairwise.complete.obs",
                     ...){
 
+  # throw error if data not data.frame
+  test_if_dataframe(data)
+
   if (!all_numeric(data)) {
     stop("data input can only contain numeric values, please subset the data to the numeric values you would like.")
   } else {

R/vis-dat.R

@@ -64,6 +64,9 @@ vis_dat <- function(x,
                     warn_large_data = TRUE,
                     large_data_size = 900000) {
 
+  # throw error if x not data.frame
+  test_if_dataframe(x)
+
   # add warning for large data
   if (ncol(x) * nrow(x) > large_data_size && warn_large_data){
     stop("Data exceeds recommended size for visualisation, please consider

R/vis-expect.R

@@ -61,6 +61,9 @@
 #'
 vis_expect <- function(data, expectation, show_perc = TRUE){
 
+  # throw error if data not data.frame
+  test_if_dataframe(data)
+
   data_expect <- expect_frame(data, expectation)
 
   # calculate the overall % expecations to display in legend -------------------

R/vis-guess.R

@@ -45,6 +45,9 @@
 #' @export
 vis_guess <- function(x, palette = "default"){
 
+  # throw error if x not data.frame
+  test_if_dataframe(x)
+
 # x = messy_df
   # suppress warnings here as this is just a note about combining classes
   d <- suppressWarnings(vis_gather_(x)) %>%

R/vis-miss.R

@@ -68,6 +68,9 @@ vis_miss <- function(x,
                      large_data_size = 900000,
                      warn_large_data = TRUE){
 
+  # throw error if x not data.frame
+  test_if_dataframe(x)
+
   # add warning for large data
   if (ncol(x) * nrow(x) > large_data_size && warn_large_data) {
     stop("Data exceeds recommended size for visualisation, please consider

tests/testthat/test-vis-compare.R

@@ -19,3 +19,9 @@ test_that("vis_compare will not accept two dataframes of differing dims",{
   expect_error(
     vis_compare(iris, iris_add))
 })
+
+test_that("vis_compare fails when an object of the wrong class is provided", {
+  testthat::expect_error(vis_compare(iris, AirPassengers))
+  testthat::expect_error(vis_compare(AirPassengers, iris))
+  testthat::expect_error(vis_compare(AirPassengers, AirPassengers))
+})

tests/testthat/test-vis-cor.R

@@ -13,3 +13,7 @@ test_that("vis_cor creates the right plot",{
 test_that("vis_cor sends an error when used with the wrong data",{
   testthat::expect_error(vis_cor(iris))
 })
+
+test_that("vis_cor fails when an object of the wrong class is provided", {
+  testthat::expect_error(vis_cor(AirPassengers))
+})

tests/testthat/test-vis-dat.R

@@ -31,3 +31,7 @@ test_that("vis_dat fails when the wrong palette is provided",{
   cat(sprintf("FreeType version: %s\n", ver))
   expect_error(vis_dat(typical_data, palette = "wat"))
 })
+
+test_that("vis_dat fails when an object of the wrong class is provided", {
+  testthat::expect_error(vis_dat(AirPassengers))
+})

tests/testthat/test-vis-expect.R

@@ -25,3 +25,6 @@ test_that("vis_expect creates the right plot",{
                               vis_expect_plot_show_perc_true)
 })
 
+test_that("vis_expect fails when an object of the wrong class is provided", {
+  testthat::expect_error(vis_expect(AirPassengers, ~.x < 20))
+})

tests/testthat/test-vis-guess.R

@@ -16,3 +16,7 @@ test_that("vis_guess creates the right plot",{
 test_that("vis_guess fails when the wrong palette is provided",{
   testthat::expect_error(vis_guess(typical_data, palette = "wat"))
 })
+
+test_that("vis_guess fails when an object of the wrong class is provided", {
+  testthat::expect_error(vis_guess(AirPassengers))
+})

tests/testthat/test-vis-miss.R

@@ -19,3 +19,7 @@ test_that("vis_miss creates the right plot",{
   vdiffr::expect_doppelganger("vis_miss show percent in columns", vis_miss_plot_show_perc_col)
   vdiffr::expect_doppelganger("vis_miss no show percent in columns", vis_miss_plot_show_perc_col_t)
 })
+
+test_that("vis_miss fails when an object of the wrong class is provided", {
+  testthat::expect_error(vis_miss(AirPassengers))
+})