Massively reduce the amount of code needed for linter tests

test/command_callback/test_reek_command_callback.vader

@@ -1,34 +1,34 @@
 Before:
-  runtime ale_linters/ruby/reek.vim
-  call ale#test#SetDirectory('/testplugin/test/command_callback')
+  call ale#assert#SetUpLinterTest('ruby', 'reek')
 
 After:
-  call ale#test#RestoreDirectory()
-  call ale#linter#Reset()
-  call ale#semver#ResetVersionCache()
+  call ale#assert#TearDownLinterTest()
 
 Execute(The reek callbacks should return the correct default values):
-  AssertEqual
+  WithChainResults ['reek 5.0.0']
+  AssertLinter 'reek', [
   \ 'reek --version',
-  \ ale_linters#ruby#reek#VersionCheck(bufnr(''))
-  AssertEqual
   \ 'reek -f json --no-progress --no-color --stdin-filename %s',
-  \ ale_linters#ruby#reek#GetCommand(bufnr(''), ['reek 5.0.0'])
+  \]
 
   " Try with older versions.
   call ale#semver#ResetVersionCache()
-  AssertEqual
+
+  WithChainResults ['reek 4.8.2']
+  AssertLinter 'reek', [
+  \ 'reek --version',
   \ 'reek -f json --no-progress --no-color',
-  \ ale_linters#ruby#reek#GetCommand(bufnr(''), ['reek 4.8.2'])
+  \]
 
 Execute(The reek version check should be cached):
-  AssertEqual
+  WithChainResults ['reek 5.0.0']
+  AssertLinter 'reek', [
+  \ 'reek --version',
   \ 'reek -f json --no-progress --no-color --stdin-filename %s',
-  \ ale_linters#ruby#reek#GetCommand(bufnr(''), ['reek 5.0.0'])
+  \]
 
-  AssertEqual
+  WithChainResults []
+  AssertLinter 'reek', [
   \ '',
-  \ ale_linters#ruby#reek#VersionCheck(bufnr(''))
-  AssertEqual
   \ 'reek -f json --no-progress --no-color --stdin-filename %s',
-  \ ale_linters#ruby#reek#GetCommand(bufnr(''), [])
+  \]