DS-3138: replace tail with Last

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: flipMultivariates
 Title: Multivariate models
-Version: 1.0.6
+Version: 1.0.7
 Author: Displayr <opensource@displayr.com>
 Maintainer: Displayr <opensource@displayr.com>
 Description: Multivariate models (e.g. LDA, random forest, SVM) according to the flip Project conventions.
@@ -30,7 +30,8 @@ Imports:
     rhtmlMoonPlot,
     tensorflow,
     utils,
-    xgboost (>= 1.1.1.1)
+    xgboost (>= 1.1.1.1),
+    verbs
 Suggests:
     testthat,
     flipExampleData
@@ -46,6 +47,7 @@ Remotes:
     Displayr/flipChartBasics,
     Displayr/rhtmlHeatmap,
     Displayr/rhtmlLabeledScatter,
-    Displayr/rhtmlMoonPlot
-RoxygenNote: 7.1.0
+    Displayr/rhtmlMoonPlot,
+    Displayr/verbs
+RoxygenNote: 7.1.1
 Encoding: UTF-8

tests/testthat/test-randomforest.R

@@ -1,5 +1,7 @@
 context("Random Forest")
 
+library(verbs)
+
 test_that("CE-676 Incorrect error about missing values",{
     data(colas, package = "flipExampleData")
     expect_error(suppressWarnings(RandomForest(d1 ~ q2d, data = colas)), NA)
@@ -170,14 +172,14 @@ test_that("Weighted versus unweighted results",
                     D = factor(round(runif(n)*5)),
                     wgt = runif(n)/100 + .995)
       out = RandomForest(dep ~ A + B + C + D, data = df)
-      expect_equal(tail(out$original$rsq, 1), -0.1332517, tol = 0.00001)
+      expect_equal(Last(out$original$rsq, 1), -0.1332517, tol = 0.00001)
       expect_warning(RandomForest(dep ~ A + B + C + D, data = df), NA)
       # The weighted sample causes the measures of accuracy to be
       # very optimistic: https://stats.stackexchange.com/a/166492
       w <- capture_warnings(out <- RandomForest(dep ~ A + B + C + D, data = df, weights = df$wgt))
       expect_match(w[1], "are overly optimistic when a weight")
       expect_match(w[2], "Weights have been applied")
-      expect_equal(tail(out$original$rsq, 1), 0.392224, tol = 0.00001)
+      expect_equal(Last(out$original$rsq, 1), 0.392224, tol = 0.00001)
 })
 
 test_that("DS-2766: check that output doesn't get too big",