Testing some of the methods added.

api/chrome/features/chrome.feature

@@ -1,6 +1,17 @@
 Feature: The Chrome API client
 
-    Scenario: Using the Chrome.Start method
+    Scenario: Using the Chrome.start method
         Given the Chrome client
-        When the Start method is called
-        Then Google Chrome should open
+        When the start method is called
+        Then Google Chrome should open
+    
+    Scenario: Using the Chrome.start_headless method
+        Given the Chrome client
+        When the start_headless method is called
+        Then Google Chrome should open headless
+
+    Scenario: Using the Chrome.stop method
+        Given the Chrome client
+        And a Chrome instance
+        When the stop method is called upon it
+        Then this Google Chrome instance should close