add layor method test

src/Exceptions/InvalidFormat.php

@@ -2,6 +2,8 @@
 
 namespace Spatie\PdfToImage\Exceptions;
 
-class InvalidFormat extends \Exception
+use Exception;
+
+class InvalidFormat extends Exception
 {
 }

src/Exceptions/InvalidLayerMethod.php

@@ -2,6 +2,8 @@
 
 namespace Spatie\PdfToImage\Exceptions;
 
-class InvalidLayerMethod extends \Exception
+use Exception;
+
+class InvalidLayerMethod extends Exception
 {
 }

src/Exceptions/PageDoesNotExist.php

@@ -2,6 +2,8 @@
 
 namespace Spatie\PdfToImage\Exceptions;
 
-class PageDoesNotExist extends \Exception
+use Exception;
+
+class PageDoesNotExist extends Exception
 {
 }

src/Exceptions/PdfDoesNotExist.php

@@ -2,6 +2,8 @@
 
 namespace Spatie\PdfToImage\Exceptions;
 
-class PdfDoesNotExist extends \Exception
+use Exception;
+
+class PdfDoesNotExist extends Exception
 {
 }

src/Pdf.php

@@ -64,7 +64,7 @@ public function setResolution($resolution)
     public function setOutputFormat($outputFormat)
     {
         if (! $this->isValidOutputFormat($outputFormat)) {
-            throw new InvalidFormat('Format '.$outputFormat.' is not supported');
+            throw new InvalidFormat("Format {$outputFormat} is not supported");
         }
 
         $this->outputFormat = $outputFormat;
@@ -73,9 +73,9 @@ public function setOutputFormat($outputFormat)
     }
 
     /**
-     * Sets the layer method for \Imagicl::mergeImageLayers()
+     * Sets the layer method for Imagick::mergeImageLayers()
      * If int, should correspond to a predefined LAYERMETHOD constant.
-     * If null, \Imagicl::mergeImageLayers() will not be called.
+     * If null, Imagick::mergeImageLayers() will not be called.
      *
      * @param int|null
      *
@@ -88,14 +88,13 @@ public function setOutputFormat($outputFormat)
      */
     public function setLayerMethod($layerMethod)
     {
-        if (
-            is_int($layerMethod) === false &&
-            is_null($layerMethod) === false
-        ) {
-            throw new InvalidLayerMethod('LayerMethod must be integer or null');
+        if (! is_int($layerMethod)) {
+            throw new InvalidLayerMethod('LayerMethod must be an integer');
         }
 
         $this->layerMethod = $layerMethod;
+
+        return $this;
     }
 
     /**
@@ -122,7 +121,7 @@ public function isValidOutputFormat($outputFormat)
     public function setPage($page)
     {
         if ($page > $this->getNumberOfPages()) {
-            throw new PageDoesNotExist('Page '.$page.' does not exist');
+            throw new PageDoesNotExist("Page {$page} does not exist");
         }
 
         $this->page = $page;
@@ -151,7 +150,7 @@ public function saveImage($pathToImage)
     {
         $imageData = $this->getImageData($pathToImage);
 
-        return file_put_contents($pathToImage, $imageData) === false ? false : true;
+        return file_put_contents($pathToImage, $imageData) !== false;
     }
 
     /**

tests/PdfTest.php

@@ -2,6 +2,7 @@
 
 namespace Spatie\PdfToImage\Test;
 
+use Imagick;
 use PHPUnit\Framework\TestCase;
 use Spatie\PdfToImage\Pdf;
 use Spatie\PdfToImage\Exceptions\InvalidFormat;
@@ -94,4 +95,19 @@ public function it_will_accept_a_specified_file_type_and_convert_to_it()
         $this->assertSame($imagick->getFormat(), 'png');
         $this->assertNotSame($imagick->getFormat(), 'jpg');
     }
+
+    /** @test */
+    public function it_can_accept_a_layer()
+    {
+        $image = (new Pdf($this->testFile))
+            ->setLayerMethod(Imagick::LAYERMETHOD_FLATTEN)
+            ->setResolution(72)
+            ->getImageData('test.jpg')
+            ->getImageResolution();
+
+        $this->assertEquals($image['x'], 72);
+        $this->assertEquals($image['y'], 72);
+        $this->assertNotEquals($image['x'], 144);
+        $this->assertNotEquals($image['y'], 144);
+    }
 }