ale/test/command_callback/test_lintr_command_callback...

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Before:
call ale#assert#SetUpLinterTest('r', 'lintr')
After:
call ale#assert#TearDownLinterTest()
Execute(The default lintr command should be correct):
AssertLinter 'Rscript',
\ ale#path#BufferCdString(bufnr(''))
\ . 'Rscript --vanilla -e '
\ . ale#Escape('suppressPackageStartupMessages(library(lintr));'
\ . 'lint(cache = FALSE, commandArgs(TRUE), '
\ . 'with_defaults())')
\ . ' %t'
Execute(The lintr options should be configurable):
let b:ale_r_lintr_options = 'with_defaults(object_usage_linter = NULL)'
AssertLinter 'Rscript',
\ ale#path#BufferCdString(bufnr(''))
\ . 'Rscript --vanilla -e '
\ . ale#Escape('suppressPackageStartupMessages(library(lintr));'
\ . 'lint(cache = FALSE, commandArgs(TRUE), '
\ . 'with_defaults(object_usage_linter = NULL))')
\ . ' %t'
Execute(If the lint_package flag is set, lintr::lint_package should be called):
let b:ale_r_lintr_lint_package = 1
AssertLinter 'Rscript',
\ ale#path#BufferCdString(bufnr(''))
\ . 'Rscript --vanilla -e '
\ . ale#Escape('suppressPackageStartupMessages(library(lintr));'
\ . 'lint_package(cache = FALSE, '
\ . 'linters = with_defaults())')
\ . ' %t'