Avoid the version number in checkstyle tests

Author: jimhester

tests/testthat/checkstyle.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<checkstyle version="lintr-3.0.1">
+<checkstyle version="lintr-x.y.z">
   <file name="test_file">
     <error line="1" column="2" severity="error" message="foo"/>
     <error line="2" column="1" severity="info" message="bar"/>

tests/testthat/test-checkstyle_output.R

@@ -24,5 +24,7 @@ test_that("return lint report as checkstyle xml", {
   tmp <- tempfile()
   checkstyle_output(lints, tmp)
 
-  expect_equal(readLines(tmp), readLines("checkstyle.xml"))
+  # The second line is the checkstyle version, so we ignore it during the
+  # check, so we don't have to update the version every release.
+  expect_equal(readLines(tmp)[-2], readLines("checkstyle.xml")[-2])
 })