AC-10573: Static deploy doesn't update files

Updated test coverage

Author: sumesh-GL

lib/internal/Magento/Framework/App/Test/Unit/View/Asset/PublisherTest.php

@@ -1,7 +1,7 @@
 <?php
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2014 Adobe
+ * All rights reserved.
  */
 declare(strict_types=1);
 
@@ -115,6 +115,46 @@ public function testPublish()
         $this->assertTrue($this->object->publish($this->getAsset()));
     }
 
+    public function testPublishWithSourceFileNewer()
+    {
+        $this->staticDirRead->expects($this->once())
+            ->method('isExist')
+            ->with('some/file.ext')
+            ->willReturn(true);
+        $this->staticDirRead->expects($this->once())
+            ->method('stat')
+            ->with('some/file.ext')
+            ->willReturn(['mtime' => 1000]);
+
+        $materializationStrategy =
+            $this->getMockForAbstractClass(StrategyInterface::class);
+
+        $this->materializationStrategyFactory->expects($this->once())
+            ->method('create')
+            ->with($this->getAsset())
+            ->willReturn($materializationStrategy);
+        $materializationStrategy->expects($this->once())
+            ->method('publishFile')
+            ->with($this->sourceDirWrite, $this->staticDirWrite, 'file.ext', 'some/file.ext')
+            ->willReturn(true);
+
+        $this->assertTrue($this->object->publish($this->getAsset()));
+    }
+
+    public function testPublishWithSourceFileOlder()
+    {
+        $this->staticDirRead->expects($this->once())
+            ->method('isExist')
+            ->with('some/file.ext')
+            ->willReturn(true);
+        $this->staticDirRead->expects($this->once())
+            ->method('stat')
+            ->with('some/file.ext')
+            ->willReturn(['mtime' => 0]);
+
+        $this->assertTrue($this->object->publish($this->getAsset()));
+    }
+
     /**
      * Create an asset mock
      *

lib/internal/Magento/Framework/App/View/Asset/Publisher.php

@@ -79,16 +79,11 @@ private function isSourceFileNewer(Asset\LocalInterface $asset, $dir, $targetPat
     {
         $sourceFile = $asset->getSourceFile();
 
-        // Check if source file exists
-        if (!file_exists($sourceFile)) {
-            return false;
-        }
-
         $sourceMtime = $this->getFileModificationTime($sourceFile);
         $targetStat = $dir->stat($targetPath);
         $targetMtime = $targetStat['mtime'] ?? 0;
 
-        return $sourceMtime > $targetMtime;
+        return ($sourceMtime > $targetMtime) || ($sourceMtime === 0 && $targetMtime > 0);
     }
 
     /**