add tests

DESCRIPTION

@@ -44,6 +44,7 @@ Imports:
     utils
 Suggests:
     BH,
+    betareg,
     brms,
     coda,
     collapse,

tests/testthat/_snaps/betareg.md

@@ -0,0 +1,50 @@
+# estimate_means for betareg
+
+    Code
+      print(out, zap_small = TRUE)
+    Output
+      Estimated Marginal Means
+      
+      batch | Proportion |   SE |       95% CI |     z
+      ------------------------------------------------
+      1     |       0.31 | 0.01 | [0.29, 0.34] | 26.00
+      2     |       0.23 | 0.01 | [0.21, 0.26] | 16.76
+      3     |       0.28 | 0.01 | [0.25, 0.31] | 18.78
+      4     |       0.19 | 0.01 | [0.17, 0.21] | 19.96
+      5     |       0.20 | 0.01 | [0.18, 0.22] | 19.16
+      6     |       0.19 | 0.01 | [0.17, 0.21] | 17.83
+      7     |       0.12 | 0.01 | [0.11, 0.14] | 15.57
+      8     |       0.12 | 0.01 | [0.10, 0.13] | 14.56
+      9     |       0.11 | 0.01 | [0.09, 0.12] | 12.25
+      10    |       0.07 | 0.01 | [0.06, 0.09] | 12.78
+      
+      Variable predicted: yield
+      Predictors modulated: batch
+      Predictors averaged: temp (3.3e+02)
+      Predictions are on the response-scale.
+
+# estimate_relation for betareg
+
+    Code
+      print(out, zap_small = TRUE)
+    Output
+      Model-based Predictions
+      
+      batch | Predicted |       95% CI
+      --------------------------------
+      1     |      0.31 | [0.28, 0.35]
+      2     |      0.23 | [0.21, 0.25]
+      3     |      0.28 | [0.25, 0.31]
+      4     |      0.19 | [0.17, 0.21]
+      5     |      0.20 | [0.18, 0.22]
+      6     |      0.19 | [0.17, 0.21]
+      7     |      0.12 | [0.11, 0.14]
+      8     |      0.12 | [0.10, 0.13]
+      9     |      0.11 | [0.09, 0.12]
+      10    |      0.07 | [0.06, 0.09]
+      
+      Variable predicted: yield
+      Predictors modulated: batch
+      Predictors controlled: temp (3.3e+02)
+      Predictions are on the response-scale.
+

tests/testthat/test-betareg.R

@@ -0,0 +1,19 @@
+skip_on_cran()
+skip_if_offline()
+skip_if_not_installed("marginaleffects")
+skip_if_not_installed("betareg")
+
+test_that("estimate_means for betareg", {
+  data("GasolineYield", package = "betareg")
+  m1 <- betareg::betareg(yield ~ batch + temp, data = GasolineYield)
+  out <- estimate_means(m1, "batch")
+  expect_snapshot(print(out, zap_small = TRUE))
+})
+
+
+test_that("estimate_relation for betareg", {
+  data("GasolineYield", package = "betareg")
+  m1 <- betareg::betareg(yield ~ batch + temp, data = GasolineYield)
+  out <- estimate_relation(m1, by = "batch", verbose = FALSE)
+  expect_snapshot(print(out, zap_small = TRUE))
+})