add php-cs-fixer to list of fixers

test/fixers/test_php_cs_fixer.vader

@@ -0,0 +1,46 @@
+Before:
+  Save g:ale_php_cs_fixer_executable
+  let g:ale_php_cs_fixer_executable = 'php-cs-fixer'
+
+  call ale#test#SetDirectory('/testplugin/test/fixers')
+  silent cd ..
+  silent cd command_callback
+  let g:dir = getcwd()
+
+After:
+  Restore
+
+  call ale#test#RestoreDirectory()
+
+
+Execute(project with php-cs-fixer should use local by default):
+  call ale#test#SetFilename('php_paths/project-with-php-cs-fixer/test.php')
+
+  AssertEqual
+  \ ale#path#Simplify(g:dir . '/php_paths/project-with-php-cs-fixer/vendor/bin/php-cs-fixer'),
+  \ ale#fixers#php_cs_fixer#GetExecutable(bufnr(''))
+
+Execute(use-global should override local detection):
+  let g:ale_php_cs_fixer_use_global = 1
+  call ale#test#SetFilename('php_paths/project-with-php-cs-fixer/test.php')
+
+  AssertEqual
+  \ 'php-cs-fixer',
+  \ ale#fixers#php_cs_fixer#GetExecutable(bufnr(''))
+
+Execute(project without php-cs-fixer should use global):
+  call ale#test#SetFilename('php_paths/project-without-php-cs-fixer/test.php')
+
+  AssertEqual
+  \ 'php-cs-fixer',
+  \ ale#fixers#php_cs_fixer#GetExecutable(bufnr(''))
+
+
+
+
+Execute(The php-cs-fixer callback should return the correct default values):
+  call ale#test#SetFilename('php_paths/project-without-php-cs-fixer/foo/test.php')
+
+  AssertEqual
+  \ {'read_temporary_file': 1, 'command': ale#Escape('php-cs-fixer') . ' fix %t' },
+  \ ale#fixers#php_cs_fixer#Fix(bufnr(''))