R/test_an_object.R

In Data-Camp/testwhat: Easily write submission correctness tests for R exercises

# Deprecated

test_an_object <- function(name, 
                           undefined_msg = NULL,
                           eq_condition = "equivalent") {
  fail_if_v2_only()
  
  # Get needed elements from tw
  student_env <- ex()$get("student_env")
  solution_env <- ex()$get("solution_env")
  
  if (is.null(undefined_msg)) {
    # Avoid returning this message, always set undefined_msg
    undefined_msg <- "There is some object missing in your code."
  }
  
  check_defined(name, solution_env)
  solution <- get(name, envir = solution_env, inherits = FALSE)
  
  valid_values <- list()
  length(valid_values) <- length(ls(student_env))
  
  counter <- 1
  for (student_var in ls(student_env)) {
    student_value <- get(student_var, envir = student_env, inherits = FALSE)
    if (identical(class(student_value), class(solution))) {
      valid_values[[counter]] <- student_value
      counter <- counter + 1
    }
  }
  
  if (counter > 1) {
    correct <- vapply(valid_values[1:counter-1], function(x) { is_equal(x, solution, eq_condition) }, logical(1))
  } else {
    correct <- FALSE
  }
  
  check_that(is_true(any(correct)), feedback = undefined_msg)
}