diff --git a/DESCRIPTION b/DESCRIPTION
index 79ddb3f..f1210b2 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -12,6 +12,8 @@ License: MIT + file LICENSE
 Encoding: UTF-8
 LazyData: true
 RoxygenNote: 6.0.1
-Suggests: covr
+Suggests: 
+    covr,
+    testthat (>= 2.0.0)
 Imports: 
     dplyr (>= 0.7.6)
diff --git a/tests/testthat.R b/tests/testthat.R
new file mode 100644
index 0000000..d80c467
--- /dev/null
+++ b/tests/testthat.R
@@ -0,0 +1,4 @@
+library(testthat)
+library(maRgheRitaR)
+
+test_check("maRgheRitaR")
diff --git a/tests/testthat/test-center.R b/tests/testthat/test-center.R
new file mode 100644
index 0000000..d7d94fd
--- /dev/null
+++ b/tests/testthat/test-center.R
@@ -0,0 +1,5 @@
+context("test-center.R")
+
+test_that("centering works", {
+    expect_equal(center(c(1,2,3),0), c(-1,0,1))
+})
diff --git a/tests/testthat/test-rescale.R b/tests/testthat/test-rescale.R
new file mode 100644
index 0000000..6310a4d
--- /dev/null
+++ b/tests/testthat/test-rescale.R
@@ -0,0 +1,5 @@
+context("test-rescale.R")
+
+test_that("rescaling works", {
+  expect_equal(rescale(1:5), 0.25*(0:4))
+})