1 files changed, 26 insertions, 0 deletions
diff --git a/tests/testthat/test_twa.R b/tests/testthat/test_twa.R
new file mode 100644
index 00000000..a8fc0bd9
--- /dev/null
+++ b/tests/testthat/test_twa.R
@@ -0,0 +1,26 @@
+context("Calculation of maximum time weighted average concentrations (TWAs)")
+
+test_that("Time weighted average concentrations are correct", {
+  skip_on_cran()
+
+  outtimes_10 <- seq(0, 10, length.out = 10000)
+
+  ds <- "FOCUS_C"
+  for (model in models) {
+    fit <- fits[[model, ds]]
+    bpar <- summary(fit)$bpar[, "Estimate"]
+    pred_10 <- mkinpredict(fit$mkinmod,
+                odeparms = bpar[2:length(bpar)],
+                odeini = c(parent = bpar[[1]]),
+                outtimes = outtimes_10)
+    twa_num <- mean(pred_10[, "parent"])
+    names(twa_num) <- 10
+    twa_ana <- max_twa_parent(fit, 10)
+
+    # Test for absolute difference (scale = 1)
+    # The tolerance can be reduced if the length of outtimes is increased,
+    # but this needs more computing time so we stay with lenght.out = 10k
+    expect_equal(twa_num, twa_ana, tolerance = 0.003, scale = 1)
+  }
+})
+