Apply suggestions from code review

Author: jameslamb

R-package/tests/testthat/test_Predictor.R

@@ -189,11 +189,11 @@ test_that("Feature contribution predictions do not take non-general CSR or CSC i
 
     expect_error(
       predict(bst, SmatC, type = "contrib")
-      , regexp = "Predictions on sparse inputs are only allowed for 'dsparseVector', 'dgRMatrix', 'dgCMatrix' - got: dsCMatrix"  # nolint: line_length
+      , regexp = "Predictions on sparse inputs are only allowed for 'dsparseVector', 'dgRMatrix', 'dgCMatrix' - got: dsCMatrix"  # nolint: line_length.
     )
     expect_error(
       predict(bst, SmatR, type = "contrib"),
-      , regexp = "Predictions on sparse inputs are only allowed for 'dsparseVector', 'dgRMatrix', 'dgCMatrix' - got: dsRMatrix" # nolint: line_length
+      , regexp = "Predictions on sparse inputs are only allowed for 'dsparseVector', 'dgRMatrix', 'dgCMatrix' - got: dsRMatrix" # nolint: line_length.
     )
 })
 

R-package/tests/testthat/test_dataset.R

@@ -48,7 +48,7 @@ test_that("lgb.Dataset: get_field & set_field", {
   # any other label should error
   expect_error(
     set_field(dtest, "asdf", test_label)
-    , regexp = "Dataset$set_field(): field_name must be one of the following: 'label', 'weight', 'init_score', 'group'",  # nolint: line_length
+    , regexp = "Dataset$set_field(): field_name must be one of the following: 'label', 'weight', 'init_score', 'group'",  # nolint: line_length.
     , fixed = TRUE
   )
 })