TESTING: add tests for writing into bootstrap/cache and storage directories

tests/WritePermissionsTest.php

@@ -0,0 +1,43 @@
+<?php
+
+class WritePermissionsTest extends TestCase
+{
+    public function testStorageDir()
+    {
+        $this->writeToDir('test.txt');
+    }
+
+    public function testLogsDir()
+    {
+        $this->writeToDir('logs/test.txt');
+    }
+
+    public function testFrameworkDir()
+    {
+        $this->writeToDir('framework/test.txt');
+    }
+
+    public function testBootstrapCacheDir()
+    {
+        $this->writeToDir('../bootstrap/cache/test.txt');
+    }
+
+    /**
+     * Create and delete some file
+     *
+     * @param $path
+     */
+    protected function writeToDir($path)
+    {
+        $file = storage_path($path);
+        $content = uniqid();
+        $bytesWritten = @file_put_contents($file, $content);
+
+        // test writing
+        $this->assertNotFalse($bytesWritten);
+
+        // test deleting
+        $deleted = @unlink($file);
+        $this->assertTrue($deleted);
+    }
+}