diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
new file mode 100644
index 00000000..f02bcd69
--- /dev/null
+++ b/.github/workflows/codeql-analysis.yml
@@ -0,0 +1,20 @@
+name: "CodeQL"
+
+on: [pull_request]
+jobs:
+  lint:
+    name: CodeQL
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 2
+
+    - run: git checkout HEAD^2
+
+    - name: Run CodeQL
+      run: |
+        docker run --rm -v $PWD:/app composer sh -c \
+        "composer install --profile --ignore-platform-reqs && composer check"
diff --git a/composer.json b/composer.json
index 667ecfbc..e864431a 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,6 @@
     "type": "library",
     "keywords": ["php","framework","upf","utopia","storage"],
     "license": "MIT",
-    "authors": [],
     "autoload": {
         "psr-4": {"Utopia\\Storage\\":"src/Storage"}
     },
@@ -13,7 +12,8 @@
     },
     "scripts": {
         "lint": "./vendor/bin/pint --test",
-        "format": "./vendor/bin/pint"
+        "format": "./vendor/bin/pint",
+        "check": "./vendor/bin/phpstan analyse --level 5 src tests"
     },
     "require": {
         "ext-fileinfo": "*",
@@ -28,6 +28,7 @@
     "require-dev": {
         "phpunit/phpunit": "^9.3",
         "vimeo/psalm": "4.0.1",
+        "phpstan/phpstan": "1.9.x-dev",
         "laravel/pint": "1.2.*"
     },
     "minimum-stability": "dev"
diff --git a/composer.lock b/composer.lock
index 56f1adf2..4a2baa8c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0e15ac0ae89a77c7420f825af10e33fc",
+    "content-hash": "1259284323e29983e5aa6073843ff4f4",
     "packages": [
         {
             "name": "utopia-php/framework",
@@ -1274,18 +1274,77 @@
             },
             "time": "2023-02-07T18:11:17+00:00"
         },
+        {
+            "name": "phpstan/phpstan",
+            "version": "1.9.x-dev",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "6c0217aa2b146c3e28474e8be3e87188fac55dac"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/6c0217aa2b146c3e28474e8be3e87188fac55dac",
+                "reference": "6c0217aa2b146c3e28474e8be3e87188fac55dac",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "source": "https://github.com/phpstan/phpstan/tree/1.9.x"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-02-18T15:01:46+00:00"
+        },
         {
             "name": "phpunit/php-code-coverage",
             "version": "9.2.x-dev",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "b5f3416da036fb951a557518e8304b3595ff966a"
+                "reference": "87b660f75adb677ea503dd0b999dc90a999ad720"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/b5f3416da036fb951a557518e8304b3595ff966a",
-                "reference": "b5f3416da036fb951a557518e8304b3595ff966a",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/87b660f75adb677ea503dd0b999dc90a999ad720",
+                "reference": "87b660f75adb677ea503dd0b999dc90a999ad720",
                 "shasum": ""
             },
             "require": {
@@ -1349,7 +1408,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2023-02-18T16:27:54+00:00"
+            "time": "2023-02-20T06:08:06+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -1598,12 +1657,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "c1bf2dd252dec994ee27d804c038a98fd0d1d940"
+                "reference": "ada16b71314bc852f7b199856bd2e12930951d24"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/c1bf2dd252dec994ee27d804c038a98fd0d1d940",
-                "reference": "c1bf2dd252dec994ee27d804c038a98fd0d1d940",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/ada16b71314bc852f7b199856bd2e12930951d24",
+                "reference": "ada16b71314bc852f7b199856bd2e12930951d24",
                 "shasum": ""
             },
             "require": {
@@ -1692,7 +1751,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-02-18T16:26:49+00:00"
+            "time": "2023-02-20T06:03:35+00:00"
         },
         {
             "name": "psr/container",
@@ -3912,7 +3971,9 @@
     ],
     "aliases": [],
     "minimum-stability": "dev",
-    "stability-flags": [],
+    "stability-flags": {
+        "phpstan/phpstan": 20
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
diff --git a/src/Storage/Device/Local.php b/src/Storage/Device/Local.php
index 1f44a668..9e4553d4 100644
--- a/src/Storage/Device/Local.php
+++ b/src/Storage/Device/Local.php
@@ -170,8 +170,8 @@ public function abort(string $path, string $extra = ''): bool
      * Read file by given path.
      *
      * @param  string  $path
-     * @param int offset
-     * @param  int|null  $length
+     * @param  int  $offset
+     * @param  int  $length
      * @return string
      *
      * @throws Exception
diff --git a/src/Storage/Device/S3.php b/src/Storage/Device/S3.php
index 7b6161c7..6df5c5cc 100644
--- a/src/Storage/Device/S3.php
+++ b/src/Storage/Device/S3.php
@@ -214,10 +214,9 @@ public function getPath(string $filename, string $prefix = null): string
      *
      * @param  string  $source
      * @param  string  $path
-     * @param int chunk
-     * @param int chunks
+     * @param  int  $chunk
+     * @param  int  $chunks
      * @param  array  $metadata
-     * @return int
      *
      * @throws \Exception
      */
@@ -347,11 +346,12 @@ public function abort(string $path, string $extra = ''): bool
      * Read file or part of file by given path, offset and length.
      *
      * @param  string  $path
-     * @param int offset
-     * @param int length
+     * @param  int  $offset
+     * @param  int  $length
      * @return string
      *
      * @throws \Exception
+     * @throws \Exception
      */
     public function read(string $path, int $offset = 0, int $length = null): string
     {
@@ -441,10 +441,13 @@ public function delete(string $path, bool $recursive = false): bool
     /**
      * Get list of objects in the given path.
      *
-     * @param  string  $path
+     * @param  string  $prefix
+     * @param  int  $maxKeys
+     * @param  string  $continuationToken
      * @return array
      *
      * @throws \Exception
+     * @throws \Exception
      */
     private function listObjects($prefix = '', $maxKeys = 1000, $continuationToken = '')
     {
@@ -642,7 +645,7 @@ private function getInfo(string $path): array
      *
      * @param  string  $method
      * @param  string  $uri
-     * @param array parameters
+     * @param  array  $parameters
      * @return string
      */
     private function getSignatureV4(string $method, string $uri, array $parameters = []): string
@@ -769,7 +772,7 @@ private function call(string $method, string $uri, string $data = '', array $par
 
             return \strlen($data);
         });
-        curl_setopt($curl, CURLOPT_HEADERFUNCTION, function ($curl, string $header) use (&$response) {
+        \curl_setopt($curl, CURLOPT_HEADERFUNCTION, function ($curl, string $header) use (&$response) {
             $len = strlen($header);
             $header = explode(':', $header, 2);
 
@@ -810,7 +813,9 @@ private function call(string $method, string $uri, string $data = '', array $par
         \curl_close($curl);
 
         // Parse body into XML
-        if ((isset($response->headers['content-type']) && $response->headers['content-type'] == 'application/xml') || (str_starts_with($response->body, '<?xml') && ($response->headers['content-type'] ?? '') !== 'image/svg+xml')) {
+        if (array_key_exists('content-type', $response->headers)
+            && ($response->headers['content-type'] == 'application/xml'
+                || (str_starts_with($response->body, '<?xml') && $response->headers['content-type'] == 'image/svg+xml'))) {
             $response->body = \simplexml_load_string($response->body);
             $response->body = json_decode(json_encode($response->body), true);
         }
diff --git a/tests/Storage/Compression/Algorithms/GZIPTest.php b/tests/Storage/Compression/Algorithms/GZIPTest.php
index 1f5a8446..2c14e956 100644
--- a/tests/Storage/Compression/Algorithms/GZIPTest.php
+++ b/tests/Storage/Compression/Algorithms/GZIPTest.php
@@ -21,7 +21,7 @@ public function tearDown(): void
     {
     }
 
-    public function testName()
+    public function testName(): void
     {
         $this->assertEquals($this->object->getName(), 'gzip');
     }
diff --git a/tests/Storage/Compression/Algorithms/ZstdTest.php b/tests/Storage/Compression/Algorithms/ZstdTest.php
index 488cd290..aab3025e 100644
--- a/tests/Storage/Compression/Algorithms/ZstdTest.php
+++ b/tests/Storage/Compression/Algorithms/ZstdTest.php
@@ -18,7 +18,7 @@ public function tearDown(): void
     {
     }
 
-    public function testName()
+    public function testName(): void
     {
         $this->assertEquals($this->object->getName(), 'zstd');
     }
diff --git a/tests/Storage/Device/LocalTest.php b/tests/Storage/Device/LocalTest.php
index ebaed963..c4342c13 100644
--- a/tests/Storage/Device/LocalTest.php
+++ b/tests/Storage/Device/LocalTest.php
@@ -47,17 +47,17 @@ public function testDescription()
         $this->assertEquals($this->object->getDescription(), 'Adapter for Local storage that is in the physical or virtual machine or mounted to it.');
     }
 
-    public function testRoot()
+    public function testRoot(): void
     {
         $this->assertEquals($this->object->getRoot(), $this->object->getAbsolutePath(__DIR__.'/../../resources/disk-a'));
     }
 
-    public function testPath()
+    public function testPath(): void
     {
         $this->assertEquals($this->object->getPath('image.png'), $this->object->getAbsolutePath(__DIR__.'/../../resources/disk-a').'/image.png');
     }
 
-    public function testWrite()
+    public function testWrite(): void
     {
         $this->assertEquals($this->object->write($this->object->getPath('text.txt'), 'Hello World'), true);
         $this->assertEquals(file_exists($this->object->getPath('text.txt')), true);
@@ -66,7 +66,7 @@ public function testWrite()
         $this->object->delete($this->object->getPath('text.txt'));
     }
 
-    public function testRead()
+    public function testRead(): void
     {
         $this->assertEquals($this->object->write($this->object->getPath('text-for-read.txt'), 'Hello World'), true);
         $this->assertEquals($this->object->read($this->object->getPath('text-for-read.txt')), 'Hello World');
@@ -74,7 +74,7 @@ public function testRead()
         $this->object->delete($this->object->getPath('text-for-read.txt'));
     }
 
-    public function testFileExists()
+    public function testFileExists(): void
     {
         $this->assertEquals($this->object->write($this->object->getPath('text-for-test-exists.txt'), 'Hello World'), true);
         $this->assertEquals($this->object->exists($this->object->getPath('text-for-test-exists.txt')), true);
@@ -83,7 +83,7 @@ public function testFileExists()
         $this->object->delete($this->object->getPath('text-for-test-exists.txt'));
     }
 
-    public function testMove()
+    public function testMove(): void
     {
         $this->assertEquals($this->object->write($this->object->getPath('text-for-move.txt'), 'Hello World'), true);
         $this->assertEquals($this->object->read($this->object->getPath('text-for-move.txt')), 'Hello World');
@@ -97,7 +97,7 @@ public function testMove()
         $this->object->delete($this->object->getPath('text-for-move-new.txt'));
     }
 
-    public function testDelete()
+    public function testDelete(): void
     {
         $this->assertEquals($this->object->write($this->object->getPath('text-for-delete.txt'), 'Hello World'), true);
         $this->assertEquals($this->object->read($this->object->getPath('text-for-delete.txt')), 'Hello World');
@@ -148,7 +148,7 @@ public function testPartUpload()
         $totalSize = $this->object->getFileSize($source);
         $chunkSize = 2097152;
 
-        $chunks = ceil($totalSize / $chunkSize);
+        $chunks = intval(ceil($totalSize / $chunkSize));
 
         $chunk = 1;
         $start = 0;
@@ -178,7 +178,7 @@ public function testAbort()
         $dest = $this->object->getPath('abcduploaded.mp4');
         $totalSize = $this->object->getFileSize($source);
         $chunkSize = 2097152;
-        $chunks = ceil($totalSize / $chunkSize);
+        $chunks = intval(ceil($totalSize / $chunkSize));
 
         $chunk = 1;
         $start = 0;
@@ -202,7 +202,7 @@ public function testAbort()
         $dest1 = $this->object->getPath('abcduploaded2.mp4');
         $totalSize = $this->object->getFileSize($source);
         $chunkSize = 2097152;
-        $chunks = ceil($totalSize / $chunkSize);
+        $chunks = intval(ceil($totalSize / $chunkSize));
 
         $chunk = 1;
         $start = 0;
diff --git a/tests/Storage/S3Base.php b/tests/Storage/S3Base.php
index dd82daea..416dd574 100644
--- a/tests/Storage/S3Base.php
+++ b/tests/Storage/S3Base.php
@@ -35,7 +35,7 @@ public function setUp(): void
         $this->uploadTestFiles();
     }
 
-    private function uploadTestFiles()
+    private function uploadTestFiles(): void
     {
         $this->object->upload(__DIR__.'/../resources/disk-a/kitten-1.jpg', $this->object->getPath('testing/kitten-1.jpg'));
         $this->object->upload(__DIR__.'/../resources/disk-a/kitten-2.jpg', $this->object->getPath('testing/kitten-2.jpg'));
@@ -43,7 +43,7 @@ private function uploadTestFiles()
         $this->object->upload(__DIR__.'/../resources/disk-b/kitten-2.png', $this->object->getPath('testing/kitten-2.png'));
     }
 
-    private function removeTestFiles()
+    private function removeTestFiles(): void
     {
         $this->object->delete($this->object->getPath('testing/kitten-1.jpg'));
         $this->object->delete($this->object->getPath('testing/kitten-2.jpg'));
@@ -56,7 +56,7 @@ public function tearDown(): void
         $this->removeTestFiles();
     }
 
-    public function testName()
+    public function testName(): void
     {
         $this->assertEquals($this->getAdapterName(), $this->object->getName());
     }
@@ -66,29 +66,29 @@ public function testType()
         $this->assertEquals($this->getAdapterType(), $this->object->getType());
     }
 
-    public function testDescription()
+    public function testDescription(): void
     {
         $this->assertEquals($this->getAdapterDescription(), $this->object->getDescription());
     }
 
-    public function testRoot()
+    public function testRoot(): void
     {
         $this->assertEquals($this->root, $this->object->getRoot());
     }
 
-    public function testPath()
+    public function testPath(): void
     {
         $this->assertEquals($this->root.'/image.png', $this->object->getPath('image.png'));
     }
 
-    public function testWrite()
+    public function testWrite(): void
     {
         $this->assertEquals(true, $this->object->write($this->object->getPath('text.txt'), 'Hello World', 'text/plain'));
 
         $this->object->delete($this->object->getPath('text.txt'));
     }
 
-    public function testRead()
+    public function testRead(): void
     {
         $this->assertEquals(true, $this->object->write($this->object->getPath('text-for-read.txt'), 'Hello World', 'text/plain'));
         $this->assertEquals('Hello World', $this->object->read($this->object->getPath('text-for-read.txt')));
@@ -96,13 +96,13 @@ public function testRead()
         $this->object->delete($this->object->getPath('text-for-read.txt'));
     }
 
-    public function testFileExists()
+    public function testFileExists(): void
     {
         $this->assertEquals(true, $this->object->exists($this->object->getPath('testing/kitten-1.jpg')));
         $this->assertEquals(false, $this->object->exists($this->object->getPath('testing/kitten-5.jpg')));
     }
 
-    public function testMove()
+    public function testMove(): void
     {
         $this->assertEquals(true, $this->object->write($this->object->getPath('text-for-move.txt'), 'Hello World', 'text/plain'));
         $this->assertEquals(true, $this->object->exists($this->object->getPath('text-for-move.txt')));
@@ -113,7 +113,7 @@ public function testMove()
         $this->object->delete($this->object->getPath('text-for-move-new.txt'));
     }
 
-    public function testDelete()
+    public function testDelete(): void
     {
         $this->assertEquals(true, $this->object->write($this->object->getPath('text-for-delete.txt'), 'Hello World', 'text/plain'));
         $this->assertEquals(true, $this->object->exists($this->object->getPath('text-for-delete.txt')));
@@ -128,7 +128,7 @@ public function testSVGUpload()
         $this->assertEquals(true, $this->object->delete($this->object->getPath('testing/appwrite.svg')));
     }
 
-    public function testDeletePath()
+    public function testDeletePath(): void
     {
         // Test Single Object
         $path = $this->object->getPath('text-for-delete-path.txt');
@@ -154,13 +154,13 @@ public function testDeletePath()
         $this->assertEquals(false, $this->object->exists($path2));
     }
 
-    public function testFileSize()
+    public function testFileSize(): void
     {
         $this->assertEquals(599639, $this->object->getFileSize($this->object->getPath('testing/kitten-1.jpg')));
         $this->assertEquals(131958, $this->object->getFileSize($this->object->getPath('testing/kitten-2.jpg')));
     }
 
-    public function testFileMimeType()
+    public function testFileMimeType(): void
     {
         $this->assertEquals('image/jpeg', $this->object->getFileMimeType($this->object->getPath('testing/kitten-1.jpg')));
         $this->assertEquals('image/jpeg', $this->object->getFileMimeType($this->object->getPath('testing/kitten-2.jpg')));
@@ -168,7 +168,7 @@ public function testFileMimeType()
         $this->assertEquals('image/png', $this->object->getFileMimeType($this->object->getPath('testing/kitten-2.png')));
     }
 
-    public function testFileHash()
+    public function testFileHash(): void
     {
         $this->assertEquals('7551f343143d2e24ab4aaf4624996b6a', $this->object->getFileHash($this->object->getPath('testing/kitten-1.jpg')));
         $this->assertEquals('81702fdeef2e55b1a22617bce4951cb5', $this->object->getFileHash($this->object->getPath('testing/kitten-2.jpg')));
@@ -186,12 +186,12 @@ public function testDirectorySize()
         $this->assertEquals(-1, $this->object->getDirectorySize('resources/disk-a/'));
     }
 
-    public function testPartitionFreeSpace()
+    public function testPartitionFreeSpace(): void
     {
         $this->assertEquals(-1, $this->object->getPartitionFreeSpace());
     }
 
-    public function testPartitionTotalSpace()
+    public function testPartitionTotalSpace(): void
     {
         $this->assertEquals(-1, $this->object->getPartitionTotalSpace());
     }
@@ -204,7 +204,7 @@ public function testPartUpload()
         // AWS S3 requires each part to be at least 5MB except for last part
         $chunkSize = 5 * 1024 * 1024;
 
-        $chunks = ceil($totalSize / $chunkSize);
+        $chunks = intval(ceil($totalSize / $chunkSize));
 
         $chunk = 1;
         $start = 0;
diff --git a/tests/Storage/StorageTest.php b/tests/Storage/StorageTest.php
index 3f04feb8..1fadd343 100644
--- a/tests/Storage/StorageTest.php
+++ b/tests/Storage/StorageTest.php
@@ -20,7 +20,7 @@ public function tearDown(): void
     {
     }
 
-    public function testGetters()
+    public function testGetters(): void
     {
         $this->assertEquals(get_class(Storage::getDevice('disk-a')), 'Utopia\Storage\Device\Local');
         $this->assertEquals(get_class(Storage::getDevice('disk-b')), 'Utopia\Storage\Device\Local');
@@ -33,7 +33,7 @@ public function testGetters()
         }
     }
 
-    public function testExists()
+    public function testExists(): void
     {
         $this->assertEquals(Storage::exists('disk-a'), true);
         $this->assertEquals(Storage::exists('disk-b'), true);
diff --git a/tests/Storage/Validator/FileExtTest.php b/tests/Storage/Validator/FileExtTest.php
index b3b6a69a..90c0fe3c 100644
--- a/tests/Storage/Validator/FileExtTest.php
+++ b/tests/Storage/Validator/FileExtTest.php
@@ -21,7 +21,7 @@ public function tearDown(): void
     {
     }
 
-    public function testValues()
+    public function testValues(): void
     {
         $this->assertEquals($this->object->isValid(''), false);
         $this->assertEquals($this->object->isValid(null), false);
diff --git a/tests/Storage/Validator/FileNameTest.php b/tests/Storage/Validator/FileNameTest.php
index f3358bfe..f9776b1e 100644
--- a/tests/Storage/Validator/FileNameTest.php
+++ b/tests/Storage/Validator/FileNameTest.php
@@ -21,7 +21,7 @@ public function tearDown(): void
     {
     }
 
-    public function testValues()
+    public function testValues(): void
     {
         $this->assertEquals($this->object->isValid(''), false);
         $this->assertEquals($this->object->isValid(null), false);
diff --git a/tests/Storage/Validator/FileSizeTest.php b/tests/Storage/Validator/FileSizeTest.php
index 20deee4c..b254a571 100644
--- a/tests/Storage/Validator/FileSizeTest.php
+++ b/tests/Storage/Validator/FileSizeTest.php
@@ -21,7 +21,7 @@ public function tearDown(): void
     {
     }
 
-    public function testValues()
+    public function testValues(): void
     {
         $this->assertEquals($this->object->isValid(1001), false);
         $this->assertEquals($this->object->isValid(1000), true);
diff --git a/tests/Storage/Validator/FileTypeTest.php b/tests/Storage/Validator/FileTypeTest.php
index c246c06d..1aee5146 100644
--- a/tests/Storage/Validator/FileTypeTest.php
+++ b/tests/Storage/Validator/FileTypeTest.php
@@ -21,7 +21,7 @@ public function tearDown(): void
     {
     }
 
-    public function testValues()
+    public function testValues(): void
     {
         $this->assertEquals($this->object->isValid(__DIR__.'/../../resources/disk-a/kitten-1.jpg'), true);
         $this->assertEquals($this->object->isValid(__DIR__.'/../../resources/disk-a/kitten-2.jpg'), true);
diff --git a/tests/Storage/Validator/UploadTest.php b/tests/Storage/Validator/UploadTest.php
index 35de5cbb..139c334d 100644
--- a/tests/Storage/Validator/UploadTest.php
+++ b/tests/Storage/Validator/UploadTest.php
@@ -21,7 +21,7 @@ public function tearDown(): void
     {
     }
 
-    public function testValues()
+    public function testValues(): void
     {
         $this->assertEquals($this->object->isValid(__DIR__.'/../../resources/disk-a/kitten-1.jpg'), false);
         $this->assertEquals($this->object->isValid(__DIR__.'/../../resources/disk-a/kitten-2.jpg'), false);