First pass at diff_check unit testing

tests/testthat/test-diff_check.R

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+# Run all tests in this script:
+## testthat::test_file(file.path("tests", "testthat", "test-diff_check.R"))
+
+# Error testing
+test_that("Errors work as desired", {
+
+   # Make two vectors
+   vec1 <- c("x", "a", "b")
+   vec2 <- c("y", "z", "a")
+
+   # Inputs testing
+   expect_error(diff_check(old = NULL, new = vec2, sort = TRUE, return = TRUE))
+   expect_error(diff_check(old = vec1, new = NULL, sort = TRUE, return = TRUE))
+   expect_error(diff_check(old = as.data.frame(vec1), new = vec2, sort = TRUE, return = TRUE))
+   expect_error(diff_check(old = vec1, new = as.data.frame(vec2), sort = TRUE, return = TRUE))
+})
+
+# Warning testing
+test_that("Warnings work as desired", {
+
+  # Make two vectors
+  vec1 <- c("x", "a", "b")
+  vec2 <- c("y", "z", "a")
+
+  # Expected warning contexts
+  expect_warning(diff_check(old = vec1, new = vec2, sort = "true", return = TRUE))
+  expect_warning(diff_check(old = vec1, new = vec2, sort = TRUE, return = "true"))
+})
+
+# Message testing
+test_that("Messages work as desired", {
+
+  # Make two vectors
+  vec1 <- c("x", "a", "b")
+  vec2 <- c("y", "z", "a")
+
+  # Expected message contexts
+  expect_message(diff_check(old = vec1, new = vec2, sort = FALSE, return = FALSE))
+})
+
+# Output testing
+test_that("Outputs are as expected", {
+
+  # Make two vectors
+  vec1 <- c("x", "a", "b")
+  vec2 <- c("y", "z", "a")
+
+  # Compare
+  diff_out <- diff_check(old = vec1, new = vec2, sort = FALSE, return = TRUE)
+
+  # Expected outputs
+  expect_equal(class(diff_out), "list")
+})