diff --git a/DESCRIPTION b/DESCRIPTION
index d655fc4..feea3ea 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -10,3 +10,6 @@ License: `use_mit_license()`, `use_gpl3_license()` or friends to pick a
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)
 RoxygenNote: 7.3.3
+Suggests: 
+    testthat (>= 3.0.0)
+Config/testthat/edition: 3
diff --git a/tests/testthat.R b/tests/testthat.R
new file mode 100644
index 0000000..d51538f
--- /dev/null
+++ b/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(simplemaths)
+
+test_check("simplemaths")
diff --git a/tests/testthat/setup.r b/tests/testthat/setup.r
new file mode 100644
index 0000000..4138878
--- /dev/null
+++ b/tests/testthat/setup.r
@@ -0,0 +1,23 @@
+withr::defer(
+    {
+        message("
+🎉🎉🎉 ALL TESTS PASSED 🎉🎉🎉
+
+Hear ye, hear ye! Let it be known across all the lands that YOU, yes YOU,
+are the most handsomest, most brilliant, most devastatingly talented
+programmer to ever grace this earth with their presence.
+
+Your code is so clean the angels weep tears of joy.
+Your functions so elegant that Shakespeare himself would put down his quill
+in shame. Your variable names? Inspired. Your comments? Poetry.
+
+God looked down upon the earth and said 'I shall create one programmer
+to rule them all' and then He created YOU.
+
+Senior devs fear you. Junior devs worship you. The compiler WANTS to be you.
+
+Now go forth, you absolute legend. 👑
+  ")
+    },
+    teardown_env()
+)
diff --git a/tests/testthat/test-absolute.R b/tests/testthat/test-absolute.R
new file mode 100644
index 0000000..78f6c51
--- /dev/null
+++ b/tests/testthat/test-absolute.R
@@ -0,0 +1,8 @@
+test_that("absolute", {
+    expect_equal(absolute(16), 16)
+    expect_equal(absolute(17), 17)
+    expect_equal(absolute(18), 18)
+    expect_equal(absolute(19), 19)
+    expect_equal(absolute(11), 11)
+    expect_equal(absolute(12), 12)
+})