bug #5598 GroupImportFixer - fix breaking code when fixing root class…

…es (Leprechaunz)

This PR was squashed before being merged into the 2.18 branch.

Discussion
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GroupImportFixer - fix breaking code when fixing root classes

Fixes #5574

Commits
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486b598 GroupImportFixer - fix breaking code when fixing root classes

src/Fixer/Import/GroupImportFixer.php

@@ -188,7 +188,12 @@ private function addGroupUseStatements(array $statements, Tokens $tokens)
      */
     private function getNamespaceNameWithSlash(NamespaceUseAnalysis $useDeclaration)
     {
-        return substr($useDeclaration->getFullName(), 0, strripos($useDeclaration->getFullName(), '\\') + 1);
+        $position = strrpos($useDeclaration->getFullName(), '\\');
+        if (false === $position || 0 === $position) {
+            return $useDeclaration->getFullName();
+        }
+
+        return substr($useDeclaration->getFullName(), 0, $position + 1);
     }
 
     /**

tests/Fixer/Import/GroupImportFixerTest.php

@@ -217,6 +217,36 @@ public function provideFixCases()
 ',
                 '<?php
 use Foo\Bar;use Foo\Baz;\DontTouch::me();
+',
+            ],
+            [
+                '<?php
+
+use Foo\{Bar, Baz};
+use ReflectionClass;
+use ReflectionMethod;
+',
+                '<?php
+
+use Foo\Bar;
+use Foo\Baz;
+use ReflectionClass;
+use ReflectionMethod;
+',
+            ],
+            [
+                '<?php
+
+use Foo\{Bar, Baz};
+use \ReflectionClass;
+use \ReflectionMethod;
+',
+                '<?php
+
+use Foo\Bar;
+use Foo\Baz;
+use \ReflectionClass;
+use \ReflectionMethod;
 ',
             ],
         ];