diff --git a/test/CImageResizerByAspectRatioTest.php b/test/CImageResizerByAspectRatioTest.php
new file mode 100644
index 0000000..8c09485
--- /dev/null
+++ b/test/CImageResizerByAspectRatioTest.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * A testclass
+ *
+ */
+class CImageResizerByAspectRatioTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Provider
+     *
+     * @return array
+     */
+    public function providerImages()
+    {
+        return array(
+
+            // No value set
+            array(null,  100, 100,  null, null,   null, null),
+
+            // Aspect ratio 1
+            array(1,  100, 100,  null, null,   100, 100),
+            array(1,  100, 100,  null,  100,   100, 100),
+            array(1,  100, 100,   100, null,   100, 100),
+            array(1,  100, 100,   100,  100,   100, 100),
+
+            // Aspect ratio 2
+            array(2,  100, 100,  null, null,   100,  50),
+            array(2,  100, 100,  null,  100,   200, 100),
+            array(2,  100, 100,   100, null,   100,  50),
+            array(2,  100, 100,   100,  100,   100,  50),
+
+            // Aspect ratio 0.5
+            array(1/2,  100, 100,  null, null,    50, 100),
+            array(1/2,  100, 100,  null,  100,    50, 100),
+            array(1/2,  100, 100,   100, null,   100, 200),
+            array(1/2,  100, 100,   100,  100,    50, 100),
+
+        );
+    }
+
+
+
+    /**
+     * Test
+     *
+     * @dataProvider providerImages
+     *
+     * @return void
+     */
+    public function testResize1($aspectRatio, $srcWidth, $srcHeight, $targetWidth, $targetHeight, $expectedWidth, $expectedHeight)
+    {
+        $img = new CImageResizer(/*'logger'*/);
+        //$img = new CImageResizer('logger');
+
+        $img->setSource($srcWidth, $srcHeight)
+            ->setBaseWidthHeight($targetWidth, $targetHeight)
+            ->setBaseAspecRatio($aspectRatio)
+            ->prepareTargetDimensions();
+//            ->calculateTargetWidthAndHeight();
+
+        $this->assertEquals($expectedWidth, $img->getTargetWidth(), "Width not correct.");
+        $this->assertEquals($expectedHeight, $img->getTargetHeight(), "Height not correct.");
+    }
+}
diff --git a/test/CImageResizerByDensityPixelRatioTest.php b/test/CImageResizerByDensityPixelRatioTest.php
new file mode 100644
index 0000000..b6c2c3d
--- /dev/null
+++ b/test/CImageResizerByDensityPixelRatioTest.php
@@ -0,0 +1,65 @@
+<?php
+/**
+ * A testclass
+ *
+ */
+class CImageResizerByDevicePixelRatioTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Provider
+     *
+     * @return array
+     */
+    public function providerImages()
+    {
+        return array(
+
+            // No value set
+            array(null,  100, 100,  null, null,   null, null),
+
+            // dpr 1
+            array(1,  100, 100,  null, null,    100,  100),
+            array(1,  100, 100,  null,  100,   null,  100),
+            array(1,  100, 100,   100, null,    100, null),
+            array(1,  100, 100,   100,  100,    100,  100),
+
+            // dpr 2
+            array(2,  100, 100,  null, null,    200,  200),
+            array(2,  100, 100,  null,  200,   null,  400),
+            array(2,  100, 100,   200, null,    400, null),
+            array(2,  100, 100,   200,  200,    400,  400),
+
+            // dpr 1/2
+            array(1/2,  100, 100,  null, null,     50,   50),
+            array(1/2,  100, 100,  null,  200,   null,  100),
+            array(1/2,  100, 100,   200, null,    100, null),
+            array(1/2,  100, 100,   200,  200,    100,  100),
+
+        );
+    }
+
+
+
+    /**
+     * Test
+     *
+     * @dataProvider providerImages
+     *
+     * @return void
+     */
+    public function testResize1($dpr, $srcWidth, $srcHeight, $targetWidth, $targetHeight, $expectedWidth, $expectedHeight)
+    {
+        $img = new CImageResizer(/*'logger'*/);
+        //$img = new CImageResizer('logger');
+
+        $img->setSource($srcWidth, $srcHeight)
+            //->setResizeStrategy($img::KEEP_RATIO)
+            ->setBaseWidthHeight($targetWidth, $targetHeight)
+            ->setBaseDevicePixelRate($dpr)
+            ->prepareTargetDimensions();
+            //->calculateTargetWidthAndHeight();
+
+        $this->assertEquals($expectedWidth, $img->getTargetWidth(), "Width not correct.");
+        $this->assertEquals($expectedHeight, $img->getTargetHeight(), "Height not correct.");
+    }
+}
diff --git a/test/CImageResizerStrategyCropToFitTest.php b/test/CImageResizerStrategyCropToFitTest.php
new file mode 100644
index 0000000..f01cf6a
--- /dev/null
+++ b/test/CImageResizerStrategyCropToFitTest.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * A testclass
+ *
+ */
+class CImageResizerStrategyCropToFitTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Provider
+     *
+     * @return array
+     */
+    public function providerImages()
+    {
+        return array(
+
+            // Square
+            array(100, 100,  null, null,   100, 100,  0, 0, 100, 100),
+            array(100, 100,  null,  200,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200, null,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200,  200,   200, 200,  0, 0, 100, 100),
+
+            // Landscape
+            array(100, 200,  null, null,   100, 200,  0, 0, 100, 200),
+            array(100, 200,  null,  100,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50, null,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50,  100,    50, 100,  0, 0, 100, 200),
+
+            // Portrait
+            array(200, 100,  null, null,   200, 100,  0, 0, 200, 100),
+            array(200, 100,  null,  200,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400, null,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400,  200,   400, 200,  0, 0, 200, 100),
+
+        );
+    }
+
+
+
+    /**
+     * Test
+     *
+     * @dataProvider providerImages
+     *
+     * @return void
+     */
+    public function testResize1($srcWidth, $srcHeight, $targetWidth, $targetHeight, $targetWidthAfter, $targetHeightAfter, $cropX, $cropY, $cropWidth, $cropHeight)
+    {
+        $img = new CImageResizer(/*'logger'/**/);
+
+        $img->setSource($srcWidth, $srcHeight)
+            ->setBaseWidthHeight($targetWidth, $targetHeight)
+            ->setResizeStrategy(CImageResizer::CROP_TO_FIT)
+            ->calculateTargetWidthAndHeight();
+
+        $this->assertEquals($targetWidthAfter, $img->getTargetWidth(), "Target width not correct.");
+        $this->assertEquals($targetHeightAfter, $img->getTargetHeight(), "Target height not correct.");
+
+        $this->assertEquals($cropX, $img->getCropX(), "CropX not correct.");
+        $this->assertEquals($cropY, $img->getCropY(), "CropY not correct.");
+        $this->assertEquals($cropWidth, $img->getCropWidth(), "CropWidth not correct.");
+        $this->assertEquals($cropHeight, $img->getCropHeight(), "CropHeight not correct.");
+    }
+}
diff --git a/test/CImageResizerStrategyFillToFitTest.php b/test/CImageResizerStrategyFillToFitTest.php
new file mode 100644
index 0000000..26baa36
--- /dev/null
+++ b/test/CImageResizerStrategyFillToFitTest.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * A testclass
+ *
+ */
+class CImageResizerStrategyFillToFitTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Provider
+     *
+     * @return array
+     */
+    public function providerImages()
+    {
+        return array(
+
+            // Square
+            array(100, 100,  null, null,   100, 100,  0, 0, 100, 100),
+            array(100, 100,  null,  200,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200, null,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200,  200,   200, 200,  0, 0, 100, 100),
+
+            // Landscape
+            array(100, 200,  null, null,   100, 200,  0, 0, 100, 200),
+            array(100, 200,  null,  100,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50, null,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50,  100,    50, 100,  0, 0, 100, 200),
+
+            // Portrait
+            array(200, 100,  null, null,   200, 100,  0, 0, 200, 100),
+            array(200, 100,  null,  200,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400, null,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400,  200,   400, 200,  0, 0, 200, 100),
+
+        );
+    }
+
+
+
+    /**
+     * Test
+     *
+     * @dataProvider providerImages
+     *
+     * @return void
+     */
+    public function testResize1($srcWidth, $srcHeight, $targetWidth, $targetHeight, $targetWidthAfter, $targetHeightAfter, $cropX, $cropY, $cropWidth, $cropHeight)
+    {
+        $img = new CImageResizer(/*'logger'/**/);
+
+        $img->setSource($srcWidth, $srcHeight)
+            ->setBaseWidthHeight($targetWidth, $targetHeight)
+            ->setResizeStrategy(CImageResizer::FILL_TO_FIT)
+            ->calculateTargetWidthAndHeight();
+
+        $this->assertEquals($targetWidthAfter, $img->getTargetWidth(), "Target width not correct.");
+        $this->assertEquals($targetHeightAfter, $img->getTargetHeight(), "Target height not correct.");
+
+        $this->assertEquals($cropX, $img->getCropX(), "CropX not correct.");
+        $this->assertEquals($cropY, $img->getCropY(), "CropY not correct.");
+        $this->assertEquals($cropWidth, $img->getCropWidth(), "CropWidth not correct.");
+        $this->assertEquals($cropHeight, $img->getCropHeight(), "CropHeight not correct.");
+    }
+}
diff --git a/test/CImageResizerStrategyKeepAspectRatioTest.php b/test/CImageResizerStrategyKeepAspectRatioTest.php
new file mode 100644
index 0000000..7cb8c7a
--- /dev/null
+++ b/test/CImageResizerStrategyKeepAspectRatioTest.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * A testclass
+ *
+ */
+class CImageResizerStrategyKeepAspectRatioTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Provider
+     *
+     * @return array
+     */
+    public function providerImages()
+    {
+        return array(
+
+            // Square
+            array(100, 100,  null, null,   100, 100,  0, 0, 100, 100),
+            array(100, 100,  null,  200,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200, null,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200,  200,   200, 200,  0, 0, 100, 100),
+
+            // Landscape
+            array(100, 200,  null, null,   100, 200,  0, 0, 100, 200),
+            array(100, 200,  null,  100,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50, null,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50,  100,    50, 100,  0, 0, 100, 200),
+
+            // Portrait
+            array(200, 100,  null, null,   200, 100,  0, 0, 200, 100),
+            array(200, 100,  null,  200,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400, null,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400,  200,   400, 200,  0, 0, 200, 100),
+
+        );
+    }
+
+
+
+    /**
+     * Test
+     *
+     * @dataProvider providerImages
+     *
+     * @return void
+     */
+     public function testResize1($sw, $sh, $tw, $th, $twa, $tha, $cx, $cy, $cw, $ch)
+     {
+     $img = new CImageResizer(/*'logger'/**/);
+
+         $img->setSource($sw, $sh)
+             ->setBaseWidthHeight($tw, $th)
+             ->setResizeStrategy(CImageResizer::KEEP_RATIO)
+             ->calculateTargetWidthAndHeight();
+
+         $this->assertEquals($twa, $img->getTargetWidth(), "Target width not correct.");
+         $this->assertEquals($tha, $img->getTargetHeight(), "Target height not correct.");
+
+         $this->assertEquals($cx, $img->getCropX(), "CropX not correct.");
+         $this->assertEquals($cy, $img->getCropY(), "CropY not correct.");
+         $this->assertEquals($cw, $img->getCropWidth(), "CropWidth not correct.");
+         $this->assertEquals($ch, $img->getCropHeight(), "CropHeight not correct.");
+     }
+}
diff --git a/test/CImageResizerStrategyStretchTest.php b/test/CImageResizerStrategyStretchTest.php
new file mode 100644
index 0000000..7dc7c43
--- /dev/null
+++ b/test/CImageResizerStrategyStretchTest.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * A testclass
+ *
+ */
+class CImageResizerStrategyStretchTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Provider
+     *
+     * @return array
+     */
+    public function providerImages()
+    {
+        return array(
+
+            // Square
+            array(100, 100,  null, null,   100, 100,  0, 0, 100, 100),
+            array(100, 100,  null,  200,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200, null,   200, 200,  0, 0, 100, 100),
+            array(100, 100,   200,  200,   200, 200,  0, 0, 100, 100),
+
+            // Landscape
+            array(100, 200,  null, null,   100, 200,  0, 0, 100, 200),
+            array(100, 200,  null,  100,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50, null,    50, 100,  0, 0, 100, 200),
+            array(100, 200,    50,  100,    50, 100,  0, 0, 100, 200),
+
+            // Portrait
+            array(200, 100,  null, null,   200, 100,  0, 0, 200, 100),
+            array(200, 100,  null,  200,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400, null,   400, 200,  0, 0, 200, 100),
+            array(200, 100,   400,  200,   400, 200,  0, 0, 200, 100),
+
+        );
+    }
+
+
+
+    /**
+     * Test
+     *
+     * @dataProvider providerImages
+     *
+     * @return void
+     */
+    public function testResize1($sw, $sh, $tw, $th, $twa, $tha, $cx, $cy, $cw, $ch)
+    {
+    $img = new CImageResizer(/*'logger'/**/);
+
+        $img->setSource($sw, $sh)
+            ->setBaseWidthHeight($tw, $th)
+            ->setResizeStrategy(CImageResizer::STRETCH)
+            ->calculateTargetWidthAndHeight();
+
+        $this->assertEquals($twa, $img->getTargetWidth(), "Target width not correct.");
+        $this->assertEquals($tha, $img->getTargetHeight(), "Target height not correct.");
+
+        $this->assertEquals($cx, $img->getCropX(), "CropX not correct.");
+        $this->assertEquals($cy, $img->getCropY(), "CropY not correct.");
+        $this->assertEquals($cw, $img->getCropWidth(), "CropWidth not correct.");
+        $this->assertEquals($ch, $img->getCropHeight(), "CropHeight not correct.");
+    }
+}