do not override endline

src/PhpParser/Node/Manipulator/ClassInsertManipulator.php

@@ -9,7 +9,6 @@
 use PhpParser\Node\Stmt\Class_;
 use PhpParser\Node\Stmt\ClassConst;
 use PhpParser\Node\Stmt\ClassMethod;
-use PhpParser\Node\Stmt\Nop;
 use PhpParser\Node\Stmt\Property;
 use PhpParser\Node\Stmt\TraitUse;
 use PHPStan\Type\Type;
@@ -50,17 +49,6 @@ public function addAsFirstMethod(Class_ $class, Stmt $stmt): void
         $class->stmts[] = $stmt;
     }
 
-    /**
-     * @param Stmt[] $nodes
-     * @return Stmt[]
-     */
-    public function insertBeforeAndFollowWithNewline(array $nodes, Stmt $stmt, int $key): array
-    {
-        $nodes = $this->insertBefore($nodes, $stmt, $key);
-
-        return $this->insertBefore($nodes, new Nop(), $key);
-    }
-
     public function addConstantToClass(Class_ $class, string $constantName, ClassConst $classConst): void
     {
         if ($this->hasClassConstant($class, $constantName)) {
@@ -87,6 +75,17 @@ public function addAsFirstTrait(Class_ $class, string $traitName): void
         $this->addStatementToClassBeforeTypes($class, $trait, TraitUse::class, Property::class, ClassMethod::class);
     }
 
+    /**
+     * @param Stmt[] $nodes
+     * @return Stmt[]
+     */
+    public function insertBefore(array $nodes, Stmt $stmt, int $key): array
+    {
+        array_splice($nodes, $key, 0, [$stmt]);
+
+        return $nodes;
+    }
+
     private function tryInsertBeforeFirstMethod(Class_ $classNode, Stmt $stmt): bool
     {
         foreach ($classNode->stmts as $key => $classStmt) {
@@ -117,17 +116,6 @@ private function tryInsertAfterLastProperty(Class_ $classNode, Stmt $stmt): bool
         return false;
     }
 
-    /**
-     * @param Stmt[] $nodes
-     * @return Stmt[]
-     */
-    private function insertBefore(array $nodes, Stmt $stmt, int $key): array
-    {
-        array_splice($nodes, $key, 0, [$stmt]);
-
-        return $nodes;
-    }
-
     private function hasClassConstant(Class_ $class, string $constantName)
     {
         foreach ($class->getConstants() as $classConst) {

src/PhpParser/Printer/BetterStandardPrinter.php

@@ -79,11 +79,13 @@ public function printFormatPreserving(array $stmts, array $origStmts, array $ori
 
         $content = parent::printFormatPreserving($stmts, $origStmts, $origTokens);
 
-        // php attributes
-        $content = $this->contentPhpAttributePlaceholderReplacer->decorateContent($content);
+        // add new line in case of added stmts
+        if (count($stmts) !== count($origStmts) && ! (bool) Strings::match($content, "#\n$#")) {
+            $content .= $this->nl;
+        }
 
-        // keep EOL
-        return rtrim($content) . $this->nl;
+        // php attributes
+        return $this->contentPhpAttributePlaceholderReplacer->decorateContent($content);
     }
 
     /**

src/Rector/Namespace_/PseudoNamespaceToNamespaceRector.php

@@ -131,7 +131,7 @@ public function afterTraverse(array $nodes): array
         $namespaceNode = new Namespace_(new Name($this->newNamespace));
         foreach ($nodes as $key => $node) {
             if ($node instanceof Use_ || $node instanceof Class_) {
-                $nodes = $this->classInsertManipulator->insertBeforeAndFollowWithNewline($nodes, $namespaceNode, $key);
+                $nodes = $this->classInsertManipulator->insertBefore($nodes, $namespaceNode, $key);
 
                 break;
             }

tests/Rector/Namespace_/PseudoNamespaceToNamespaceRector/Fixture/fixture3.php.inc

@@ -2,15 +2,22 @@
 
 class PHPUnit_Abc
 {
+    public function run()
+    {
+        return 1;
+    }
 }
 
 ?>
 -----
 <?php
 
-
 namespace PHPUnit;
 
 class Abc
 {
+    public function run()
+    {
+        return 1;
+    }
 }

tests/Rector/Namespace_/PseudoNamespaceToNamespaceRector/Fixture/use_statement.php.inc

@@ -14,7 +14,6 @@ class Rector_Core_Tests_Rector_Namespace__PseudoNamespaceToNamespaceRector_Fixtu
 -----
 <?php
 
-
 namespace Rector\Core\Tests\Rector\Namespace_\PseudoNamespaceToNamespaceRector\Fixture;
 
 use Rector\Core\Tests\Rector\Namespace_\PseudoNamespaceToNamespaceRector\Source\Keep_This;