Use location of composer.json for PHP project path too (#2391)

* move php-langserver "test for .git dir" test-project to its own directory
* search for composer.json file in php-langserver first then .git dir
* add test for php-langserver composer.json

ale_linters/php/langserver.vim

@@ -5,6 +5,12 @@ call ale#Set('php_langserver_executable', 'php-language-server.php')
 call ale#Set('php_langserver_use_global', get(g:, 'ale_use_global_executables', 0))
 
 function! ale_linters#php#langserver#GetProjectRoot(buffer) abort
+    let l:composer_path = ale#path#FindNearestFile(a:buffer, 'composer.json')
+
+    if (!empty(l:composer_path))
+        return fnamemodify(l:composer_path, ':h')
+    endif
+
     let l:git_path = ale#path#FindNearestDirectory(a:buffer, '.git')
 
     return !empty(l:git_path) ? fnamemodify(l:git_path, ':h:h') : ''

test/command_callback/test_php_langserver_callbacks.vader

@@ -2,10 +2,6 @@ Before:
   call ale#assert#SetUpLinterTest('php', 'langserver')
 
 After:
-  if isdirectory(g:dir . '/.git')
-    call delete(g:dir . '/.git', 'd')
-  endif
-
   call ale#assert#TearDownLinterTest()
 
 Execute(The default executable path should be correct):
@@ -23,7 +19,12 @@ Execute(Vendor executables should be detected):
   \ ))
 
 Execute(The project path should be correct for .git directories):
-  call ale#test#SetFilename('php-langserver-project/test.php')
-  call mkdir(g:dir . '/.git')
+  call ale#test#SetFilename('php-langserver-project/with-git/test.php')
+  silent! call mkdir('php-langserver-project/with-git/.git')
 
-  AssertLSPProject g:dir
+  AssertLSPProject ale#path#Simplify(g:dir . '/php-langserver-project/with-git')
+
+Execute(The project path should be correct for composer.json file):
+  call ale#test#SetFilename('php-langserver-project/with-composer/test.php')
+
+  AssertLSPProject ale#path#Simplify(g:dir . '/php-langserver-project/with-composer')