bug #1422 Generator verifies if class exists before altering class name

Author: Antarian

src/Generator.php

@@ -147,7 +147,13 @@ public function createClassNameDetails(string $name, string $namespacePrefix, st
             // class is already "absolute" - leave it alone (but strip opening \)
             $className = substr($name, 1);
         } else {
-            $className = rtrim($fullNamespacePrefix, '\\').'\\'.Str::asClassName($name, $suffix);
+            $className = Str::asClassName($name, $suffix);
+
+            try {
+                Validator::classDoesNotExist($className);
+                $className = rtrim($fullNamespacePrefix, '\\').'\\'.$className;
+            } catch (RuntimeCommandException $e) {
+            }
         }
 
         Validator::validateClassName($className, $validationErrorMessage);

tests/GeneratorTest.php

@@ -76,5 +76,29 @@ public function getClassNameDetailsTests(): \Generator
             'App\\Entity\\User',
             'User',
         ];
+
+        yield 'non_prefixed_fake_fqcn' => [
+            'App\\Entity\\User',
+            '',
+            '',
+            'App\\App\\Entity\\User',
+            'Entity\\User',
+        ];
+
+        yield 'real_fqcn_with_suffix' => [
+            'Symfony\\Bundle\\MakerBundle\\Tests\\Generator',
+            'Test',
+            'Test',
+            'Symfony\\Bundle\\MakerBundle\\Tests\\GeneratorTest',
+            'Symfony\\Bundle\\MakerBundle\\Tests\\GeneratorTest',
+        ];
+
+        yield 'real_fqcn_without_suffix' => [
+            'Symfony\\Bundle\\MakerBundle\\Tests\\GeneratorTest',
+            '',
+            '',
+            'Symfony\\Bundle\\MakerBundle\\Tests\\GeneratorTest',
+            'Symfony\\Bundle\\MakerBundle\\Tests\\GeneratorTest',
+        ];
     }
 }