add snaps for bland-altman function (#1201)

closes #1175

---------

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Joe Zhu <joe.zhu@roche.com>

tests/testthat/_snaps/bland-altman.md

@@ -0,0 +1,62 @@
+# s_bland_altman works with default settings
+
+    Code
+      res
+    Output
+      $df
+             average difference
+      1   0.14626178 -1.5454312
+      2   0.48288981 -0.5984930
+      3  -0.38053181 -0.9101936
+      4  -0.19703545  3.5846325
+      5   0.47466676 -0.2903180
+      6  -0.43829856 -0.7643396
+      7   0.16581677  0.6432246
+      8  -0.36621383  2.2090771
+      9   0.04881564  1.0539314
+      10  0.05627658 -0.7233299
+      11  1.43523036  0.1531016
+      12  0.14352775  0.4926310
+      13 -0.11678449 -1.0089122
+      14 -1.13425246 -2.1608949
+      15 -0.12606432  2.5019905
+      16 -0.22996409  0.3700609
+      17 -0.20524011  0.3780997
+      18  0.44226140  1.0031496
+      19  0.96062329 -0.2788042
+      20  0.67853853 -0.1692744
+      
+      $difference_mean
+      [1] 0.1969954
+      
+      $ci_mean
+      [1] -0.3414723  0.7354631
+      
+      $difference_sd
+      [1] 1.392664
+      
+      $difference_se
+      [1] 0.3114091
+      
+      $upper_agreement_limit
+      [1] 2.487724
+      
+      $lower_agreement_limit
+      [1] -2.093733
+      
+      $agreement_limit_se
+      [1] 0.5393764
+      
+      $upper_agreement_limit_ci
+      [1] 1.555070 3.420377
+      
+      $lower_agreement_limit_ci
+      [1] -3.026386 -1.161079
+      
+      $t_value
+      [1] 1.729133
+      
+      $n
+      [1] 20
+      
+

tests/testthat/test-bland-altman.R

@@ -59,3 +59,47 @@ testthat::test_that("s_bland_altman works with two vectors with NA element in ei
   )
   expect_identical(res, expect, tolerance = 1e-5)
 })
+
+
+testthat::test_that("s_bland_altman works with default settings", {
+  x <- c(
+    -0.62645381, 0.18364332, -0.83562861, 1.59528080, 0.32950777, -0.82046838,
+    0.48742905, 0.73832471, 0.57578135, -0.30538839, 1.51178117, 0.38984324,
+    -0.62124058, -2.21469989, 1.12493092, -0.04493361, -0.01619026, 0.94383621,
+    0.82122120, 0.59390132
+  )
+  y <- c(
+    0.91897737, 0.78213630, 0.07456498, -1.98935170, 0.61982575, -0.05612874,
+    -0.15579551, -1.47075238, -0.47815006, 0.41794156, 1.35867955, -0.10278773,
+    0.38767161, -0.05380504, -1.37705956, -0.41499456, -0.39428995, -0.05931340,
+    1.10002537, 0.76317575
+  )
+  result <- s_bland_altman(x, y, 0.9)
+  res <- testthat::expect_silent(result)
+  testthat::expect_snapshot(res)
+})
+
+
+testthat::test_that("g_bland_altman works with default settings", {
+  x <- c(
+    -0.62645381, 0.18364332, -0.83562861, 1.59528080, 0.32950777, -0.82046838,
+    0.48742905, 0.73832471, 0.57578135, -0.30538839, 1.51178117, 0.38984324,
+    -0.62124058, -2.21469989, 1.12493092, -0.04493361, -0.01619026, 0.94383621,
+    0.82122120, 0.59390132
+  )
+  y <- c(
+    0.91897737, 0.78213630, 0.07456498, -1.98935170, 0.61982575, -0.05612874,
+    -0.15579551, -1.47075238, -0.47815006, 0.41794156, 1.35867955, -0.10278773,
+    0.38767161, -0.05380504, -1.37705956, -0.41499456, -0.39428995, -0.05931340,
+    1.10002537, 0.76317575
+  )
+  conf_level <- 0.9
+  testthat::skip_if_not_installed("vdiffr")
+
+  withr::with_options(
+    opts_partial_match_old,
+    g_bland_altman <- g_bland_altman(x, y, conf_level = conf_level)
+  )
+
+  expect_snapshot_ggplot(title = "g_bland_altman", fig = g_bland_altman, width = 10, height = 8)
+})