Add method to make setting cookies easier (#212)

* Add method to make setting cookies easier

* Remove extra blank line causing StyleCI check to fail

Author: fsalehpour

README.md

@@ -508,6 +508,15 @@ Browsershot::url('https://example.com')
    ...
 ```
 
+#### Setting Cookies
+
+To add cookies to HTTP headers, pass an array containing cookie key/value pairs to `useCookies` method:
+
+```php
+Browsershot::url('https://example.com')
+    ->useCookies(['Cookie-Key' => 'Cookie-Value'])
+   ...
+```
 
 #### Clicking on the page
 

src/Browsershot.php

@@ -107,6 +107,13 @@ public function setChromePath(string $executablePath)
         return $this;
     }
 
+    public function useCookies(array $cookies)
+    {
+        $this->setExtraHttpHeaders(['Cookie' => http_build_query($cookies, null, '; ')]);
+
+        return $this;
+    }
+
     public function setExtraHttpHeaders(array $extraHTTPHeaders)
     {
         $this->setOption('extraHTTPHeaders', $extraHTTPHeaders);
@@ -586,7 +593,6 @@ protected function getFullCommand(array $command)
             .$nodeBinary.' '
             .escapeshellarg($binPath).' '
             .escapeshellarg(json_encode($command));
-
     }
 
     protected function getNodePathCommand(string $nodeBinary): string

tests/BrowsershotTest.php

@@ -778,6 +778,31 @@ public function it_can_send_extra_http_headers()
         ], $command);
     }
 
+    /**
+     * @test
+     */
+    public function it_can_send_cookie_in_http_headers()
+    {
+        $command = Browsershot::url('https://example.com')
+            ->useCookies(['theme' => 'light', 'sessionToken' => 'abc123'])
+            ->createScreenshotCommand('screenshot.png');
+
+        $this->assertEquals([
+            'url' => 'https://example.com',
+            'action' => 'screenshot',
+            'options' => [
+                'extraHTTPHeaders' => ['Cookie' => 'theme=light; sessionToken=abc123'],
+                'path' => 'screenshot.png',
+                'viewport' => [
+                    'width' => 800,
+                    'height' => 600,
+                ],
+                'args' => [],
+                'type' => 'png',
+            ],
+        ], $command);
+    }
+
     /** @test */
     public function it_can_click_on_the_page()
     {