diff --git a/tests/testthat/test-recdevs.R b/tests/testthat/test-recdevs.R
new file mode 100644
index 00000000..9777a413
--- /dev/null
+++ b/tests/testthat/test-recdevs.R
@@ -0,0 +1,125 @@
+context("Code in recdevs.R works")
+
+test_that("Build recdevs works as expected for option none", {
+  recdevs <- build_rec_devs(rec_dev_pattern = "none", 
+                            n_scenarios = 1,
+                            yrs = 6, 
+                            iter_vec = 3
+                            )
+  expected_output <- list(list(rep(0, 6), rep(0, 6), rep(0, 6)))
+  expect_equal(recdevs, expected_output)
+  
+  recdevs <- build_rec_devs(rec_dev_pattern = "none",
+                            n_scenarios = 2,
+                            yrs = c(3,6),
+                            iter_vec = c(3,2)
+  )
+  expected_output <- list(scen_1 = list(rep(0, 3), rep(0, 3), rep(0, 3)), 
+                          scen_2 = list(rep(0, 6), rep(0, 6)))
+  expect_equivalent(recdevs, expected_output)
+})
+
+test_that("Build recdevs works as expected for option rand", {
+  iter_vec <- c(3,3)
+  seed_vals <- set_MSE_seeds(seed = 123, iter_vec = iter_vec)
+  recdevs <- build_rec_devs(rec_dev_pattern = "rand" ,
+                            n_scenarios = 2,
+                            yrs = c(3,3),
+                            iter_vec = iter_vec,
+                            scope = 1,
+                            rec_dev_pars = c(3, 1),
+                            stddev = 0.2,
+                            rec_autoCorr = NA,
+                            seed = seed_vals)
+  expect_length(recdevs, 2)
+  expect_length(recdevs[[1]], iter_vec[1])
+  # expectations to make sure scope = 1 works
+  expect_equivalent(recdevs[[1]], recdevs[[2]])
+  # setting seeds works
+  second_run <- build_rec_devs(rec_dev_pattern = "rand" ,
+                               n_scenarios = 2,
+                               yrs = c(3,3),
+                               iter_vec = iter_vec,
+                               scope = 1,
+                               rec_dev_pars = c(3, 1),
+                               stddev = 0.2,
+                               rec_autoCorr = NA,
+                               seed = seed_vals)
+  expect_equal(recdevs, second_run)
+  
+  #test scope = 2
+  recdevs_scope_2 <- build_rec_devs(rec_dev_pattern = "rand" ,
+                                    n_scenarios = 2,
+                                    yrs = c(3,3),
+                                    iter_vec = iter_vec,
+                                    scope = 2,
+                                    rec_dev_pars = c(3, 1),
+                                    stddev = 0.2,
+                                    rec_autoCorr = NA,
+                                    seed = seed_vals)
+  expect_true(all(!is.na(unlist(recdevs_scope_2))))
+  recdevs_scope_3 <- build_rec_devs(rec_dev_pattern = "rand" ,
+                                    n_scenarios = 2,
+                                    yrs = c(3,3),
+                                    iter_vec = iter_vec,
+                                    scope = 3,
+                                    rec_dev_pars = c(3, 1),
+                                    stddev = 0.2,
+                                    rec_autoCorr = NA,
+                                    seed = seed_vals)
+  expect_true(all(!is.na(unlist(recdevs_scope_3))))
+
+
+})
+
+# TODO: Add these tests
+# 
+# test_that("Build recdevs works as expected for option autocorrelated random", {
+#   iter_vec <- c(3,2)
+#   seed_vals <- set_MSE_seeds(seed = 123, iter_vec = iter_vec)
+#   recdevs <- build_rec_devs(rec_dev_pattern = "AutoCorr_rand",
+#                             n_scenarios = 2,
+#                             yrs = c(3,6),
+#                             iter_vec = iter_vec,
+#                             scope = 3,
+#                             rec_dev_pars = c(3, 1),
+#                             stddev = list(0.2, 0.2),
+#                             rec_autoCorr = NA,
+#                             seed = seed_vals)
+#   browser()
+#   expect_length(recdevs, 2)
+#   expect_length(recdevs[[1]], iter_vec[1])
+# })
+# 
+# test_that("Build recdevs works as expected for option autocorrelated specified", {
+#   iter_vec <- c(3,2)
+#   seed_vals <- set_MSE_seeds(seed = 123, iter_vec = iter_vec)
+#   recdevs <- build_rec_devs(rec_dev_pattern = "AutoCorr_Spec",
+#                             n_scenarios = 2,
+#                             yrs = c(3,6),
+#                             iter_vec = iter_vec,
+#                             scope = 3,
+#                             rec_dev_pars = c(3, 1),
+#                             stddev = 0.2,
+#                             rec_autoCorr = NA,
+#                             seed = seed_vals)
+#   browser()
+#   expect_length(recdevs, 2)
+#   expect_length(recdevs[[1]], iter_vec[1])
+# })
+# 
+# test_that("Build recdevs works as expected for custom values", {
+#   iter_vec <- c(3,2)
+#   seed_vals <- set_MSE_seeds(seed = 123, iter_vec = iter_vec)
+#   recdevs <- build_rec_devs(rec_dev_pattern = "vector",
+#                             n_scenarios = 2,
+#                             yrs = c(3,6),
+#                             iter_vec = iter_vec,
+#                             scope = 3,
+#                             rec_dev_pars = c(3, 1),
+#                             stddev = 0.2,
+#                             rec_autoCorr = NA,
+#                             seed = seed_vals)
+#   expect_length(recdevs, 2)
+#   expect_length(recdevs[[1]], iter_vec[1])
+# })