Before:
  silent! cd /testplugin/test/handler
  let g:dir = getcwd()

After:
  silent execute 'cd ' . fnameescape(g:dir)
  unlet! g:dir

Execute(Basic errors should be handled by cppcheck):
  call ale#test#SetFilename('test.cpp')

  AssertEqual
  \ [
  \   {
  \     'lnum': 5,
  \     'type': 'E',
  \     'text': 'Array ''a[10]'' accessed at index 10, which is out of bounds',
  \   },
  \   {
  \     'lnum': 7,
  \     'type': 'W',
  \     'text': 'Some other problem',
  \   },
  \ ],
  \ ale#handlers#cppcheck#HandleCppCheckFormat(bufnr(''), [
  \ '[test.cpp:5]: (error) Array ''a[10]'' accessed at index 10, which is out of bounds',
  \ '[test.cpp:7]: (warning) Some other problem',
  \ ])

Execute(Problems from other files should be ignored by cppcheck):
  call ale#test#SetFilename('test.cpp')

  AssertEqual
  \ [
  \ ],
  \ ale#handlers#cppcheck#HandleCppCheckFormat(bufnr(''), [
  \ '[bar.cpp:5]: (error) Array ''a[10]'' accessed at index 10, which is out of bounds',
  \ ])