add basic test

Author: teunbrand

tests/testthat/_snaps/edition.md

@@ -0,0 +1,16 @@
+# basic edition infrastructure works as intended
+
+    Code
+      edition_deprecate(2025, what = "foo()")
+    Condition
+      Error:
+      ! `foo()` was deprecated in ggplot2 edition 2025 and is now defunct.
+
+---
+
+    Code
+      edition_require(2025, what = "foo()")
+    Condition
+      Error in `edition_require()`:
+      ! foo() requires the 2025 edition of ggplot2.
+

tests/testthat/test-edition.R

@@ -0,0 +1,10 @@
+test_that("basic edition requirement and deprecation works as intended", {
+
+  local_edition(2025)
+  expect_snapshot(edition_deprecate(2025, what = "foo()"), error = TRUE)
+  expect_silent(edition_require(2025, what = "foo()"))
+
+  local_edition(2024)
+  expect_silent(edition_deprecate(2025, what = "foo()"))
+  expect_snapshot(edition_require(2025, what = "foo()"), error = TRUE)
+})