diff --git a/src/Exceptions/ImageNotFoundOrReadableException.php b/src/Exceptions/ImageNotFoundOrReadableException.php
new file mode 100755
index 0000000..e2acb09
--- /dev/null
+++ b/src/Exceptions/ImageNotFoundOrReadableException.php
@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+
+namespace Nelson\Resizer\Exceptions;
+
+use Exception;
+
+final class ImageNotFoundOrReadableException extends Exception
+{
+
+}
diff --git a/src/Exceptions/SecurityException.php b/src/Exceptions/SecurityException.php
new file mode 100755
index 0000000..d57238b
--- /dev/null
+++ b/src/Exceptions/SecurityException.php
@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+
+namespace Nelson\Resizer\Exceptions;
+
+use Exception;
+
+final class SecurityException extends Exception
+{
+
+}
diff --git a/src/Resizer.php b/src/Resizer.php
index 5b8a542..365f2e4 100644
--- a/src/Resizer.php
+++ b/src/Resizer.php
@@ -9,6 +9,8 @@
 use Imagine\Image\Box;
 use Imagine\Image\ImageInterface;
 use Nelson\Resizer\DI\ResizerConfig;
+use Nelson\Resizer\Exceptions\ImageNotFoundOrReadableException;
+use Nelson\Resizer\Exceptions\SecurityException;
 use Nette\SmartObject;
 use Nette\Utils\FileSystem;
 
@@ -73,14 +75,13 @@ public function process(
 		$thumbnailFileName = $params . '.' . $this->getOutputFormat($extension, $format);
 		$thumbnailPath = $this->getThumbnailDir($path) . $thumbnailFileName;
 
-		// $geometry = GeometryOld::parseGeometry($params);
 		$geometry = new Geometry($params);
 
 		if (!$this->thumbnailExists($thumbnailPath)) {
 			try {
 				$thumbnail = $this->processImage($sourceImagePath, $geometry);
 			} catch (RuntimeException $e) {
-				throw new Exception('Unable to open image - wrong permissions, empty or corrupted.');
+				throw new ImageNotFoundOrReadableException('Unable to open image - wrong permissions, empty or corrupted.');
 			}
 
 			if ($this->config->strip) {
@@ -104,13 +105,13 @@ public function getSourceImagePath(string $path): string
 	{
 		$fullPath = (string) realpath($this->config->wwwDir . DIRECTORY_SEPARATOR . $path);
 
-		if (!is_file($fullPath)) {
-			throw new Exception('Source image not found or not readable.');
-		}
-
 		// wonky, but better than nothing
 		if (strpos($path, '../') !== false) {
-			throw new Exception('Attempt to access files outside permitted path.');
+			throw new SecurityException('Attempt to access files outside permitted path.');
+		}
+
+		if (!is_file($fullPath)) {
+			throw new ImageNotFoundOrReadableException('Source image not found or not readable.');
 		}
 
 		return $fullPath;
diff --git a/tests/ResizerTest.php b/tests/ResizerTest.php
new file mode 100755
index 0000000..dd47f63
--- /dev/null
+++ b/tests/ResizerTest.php
@@ -0,0 +1,92 @@
+<?php
+declare(strict_types=1);
+
+namespace Test;
+
+use Nelson\Resizer\DI\ResizerConfig;
+use Nelson\Resizer\Exceptions\ImageNotFoundOrReadableException;
+use Nelson\Resizer\Exceptions\SecurityException;
+use Nelson\Resizer\Resizer;
+use Nette\SmartObject;
+use Nette\Utils\FileSystem;
+use Tester\Assert;
+use Tester\TestCase;
+
+// $container = require __DIR__ . '/bootstrap.php';
+require __DIR__ . '/bootstrap.php';
+
+/** @testCase */
+class ResizerTest extends TestCase
+{
+	use SmartObject;
+
+	private Resizer $resizer;
+	private string $image;
+	private ResizerConfig $config;
+
+
+	public function __construct()
+	{
+		$this->config = new ResizerConfig();
+		$this->config->tempDir = __DIR__ . '/../temp';
+		$this->config->wwwDir = __DIR__ . '/../tests';
+		$this->config->qualityJpeg = 65;
+		$this->config->qualityWebp = 65;
+		$this->config->compressionPng = 9;
+		$this->config->library = 'Gd';
+
+		$this->resizer = new Resizer($this->config, false);
+		$this->image = 'test.png';
+	}
+
+
+	// runs for every test
+	// public function setUp(): void
+	// {
+	// }
+
+
+	public function testImageNotFound(): void
+	{
+		Assert::exception(
+			function() {$this->resizer->getSourceImagePath('does_not_exist.jpg');},
+			ImageNotFoundOrReadableException::class,
+		);
+	}
+
+
+	public function testSecurityException(): void
+	{
+		Assert::exception(
+			function() {$this->resizer->getSourceImagePath('../../haxxor.png');},
+			SecurityException::class,
+		);
+	}
+
+
+	public function testImageFound(): void
+	{
+		Assert::equal(
+			__DIR__ . '/test.png',
+			$this->resizer->getSourceImagePath($this->image),
+		);
+	}
+
+
+	public function testProcess(): void
+	{
+		Assert::same(
+			FileSystem::normalizePath(__DIR__ . '/../temp/resizer/test.png/200x.png'),
+			FileSystem::normalizePath($this->resizer->process($this->image, '200x')),
+		);
+	}
+
+
+	public function tearDown()
+	{
+		FileSystem::delete($this->config->tempDir . $this->config->cache);
+	}
+}
+
+$test = new ResizerTest;
+$test->run();
diff --git a/tests/output/ResizerTest.[method=testProcess].actual b/tests/output/ResizerTest.[method=testProcess].actual
new file mode 100644
index 0000000..7460ab3
--- /dev/null
+++ b/tests/output/ResizerTest.[method=testProcess].actual
@@ -0,0 +1 @@
+/home/users/devminion/minion.dev/web/_dev/packages/nelson/resizer/temp/resizer/test.png/200x.png
\ No newline at end of file
diff --git a/tests/output/ResizerTest.[method=testProcess].expected b/tests/output/ResizerTest.[method=testProcess].expected
new file mode 100644
index 0000000..561af32
--- /dev/null
+++ b/tests/output/ResizerTest.[method=testProcess].expected
@@ -0,0 +1 @@
+/home/users/devminion/minion.dev/web/_dev/packages/nelson/resizer/tests/test.png
\ No newline at end of file
diff --git a/tests/test.png b/tests/test.png
new file mode 100755
index 0000000..94017ea
Binary files /dev/null and b/tests/test.png differ