add my test and finish the test UofUEpiBio/PHS7045-advanced-programmi…

…ng#39 (comment)

DESCRIPTION

@@ -9,8 +9,12 @@ Description: One paragraph description of what the package does as
        one or more full sentences.
 License: GPL (>= 2)
 Imports: 
-    Rcpp
+    Rcpp,
+    graphics
 LinkingTo: Rcpp
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.2
 Encoding: UTF-8
+Suggests: 
+    testthat (>= 3.0.0)
+Config/testthat/edition: 3

NAMESPACE

@@ -1,5 +1,7 @@
 # Generated by roxygen2: do not edit by hand
 
+export(myplot)
 export(rcpp_hello_world)
+import(graphics)
 importFrom(Rcpp,evalCpp)
 useDynLib(egpkg, .registration = TRUE)

R/myplot.R

@@ -0,0 +1,24 @@
+
+#' Here is the function
+#' @param x A Numeric Vector.
+#' @param y A Numeric Vector.
+#' @export
+#' @import graphics
+
+
+myplot <- function(x, y) {
+
+  if (!is.numeric(x) | !is.numeric(y)) {
+    stop("x and y must be numeric")
+  }
+
+  graphics::plot(x, y, col = "blue", pch = 19, cex = 2)
+
+  invisible(
+    list(
+      x = x,
+      y = y
+    )
+  )
+
+}

tests/testthat.R

@@ -0,0 +1,12 @@
+# This file is part of the standard setup for testthat.
+# It is recommended that you do not modify it.
+#
+# Where should you do additional test configuration?
+# Learn more about the roles of various files in:
+# * https://r-pkgs.org/testing-design.html#sec-tests-files-overview
+# * https://testthat.r-lib.org/articles/special-files.html
+
+library(testthat)
+library(egpkg)
+
+test_check("egpkg")

tests/testthat/test-myplot.R

@@ -0,0 +1,6 @@
+test_that("multiplication works", {
+  expect_error(myplot(1, 'o'))
+  expect_error(myplot('a', 1))
+  expect_s3_class(myplot(1,1), 'list')
+
+})