diff --git a/tests/testthat/test-output.R b/tests/testthat/test-output.R
index 91d427e4..5cef37b9 100644
--- a/tests/testthat/test-output.R
+++ b/tests/testthat/test-output.R
@@ -17,15 +17,17 @@ test_that('Test age parameter function works', {
   
   sim <- run_simulation(timesteps = 1, parameters)
   
-  expect_true(
-    all(
-      paste0(rep(c("n_age",
-                   "n", "n_inc", "p_inc",
-                   "n","n_inc_clinical","p_inc_clinical",
-                   "n","n_inc_severe","p_inc_severe",
-                   "n","n_detect_lm","p_detect_lm","n_detect_pcr",
-                   "ica_mean", "icm_mean","id_mean","ib_mean","iva_mean","ivm_mean"), each = 3),"_",
-             age_limits[-4]+rep(c(0,rep(c(1:3), each = 3), rep(4, 4), 5:10), each = 3),"_",age_limits[-1]-1+rep(c(0,rep(c(1:3), each = 3), rep(4, 4), 5:10), each = 3)
-      ) %in%
-        names(sim)))
+  prefixes <- c("n_age",
+                "n_inc", "p_inc",
+                "n_inc_clinical","p_inc_clinical",
+                "n_inc_severe","p_inc_severe",
+                "n_detect_lm","p_detect_lm","n_detect_pcr",
+                "ica_mean", "icm_mean","id_mean","ib_mean","iva_mean","ivm_mean")
+  offsets <- c(0, rep(1, 2), rep(2, 2), rep(3, 2), rep(4, 3), 5:10)
+  expect_equal(length(prefixes), length(offsets))
+
+  expected <- paste0(rep(prefixes, each = 3),
+                     "_", age_limits[-4]+rep(offsets, each = 3),
+                     "_", age_limits[-1]-1+rep(offsets, each = 3))
+  expect_in(expected, names(sim))
 })