Test for the new method.

api/chrome/features/chrome.feature

@@ -27,4 +27,11 @@ Feature: The Chrome API client
         And a Chrome instance
         And the id of a new Google Chrome tab opened
         When the close method is called upon the tab id
-        Then the tab must close
+        Then the tab must close
+    
+    Scenario: Using the Chrome.eval method
+        Given the Chrome client
+        And a Chrome instance
+        And the id of a new Google Chrome tab opened
+        When the eval method is called upon the tab id with a command
+        Then this command must give back a value

api/chrome/features/steps/steps.py

@@ -66,3 +66,14 @@ def step_impl(context):
 def step_impl(context):
     assert context.close_return == "", "The tab did not closed correctly."
     context.client.stop()
+
+
+# ========================== Chrome.eval () ==========================
+@when("the eval method is called upon the tab id with a command")
+def step_impl(context):
+    context.eval_value = context.client.eval(context.tab_id1, "2+2")
+
+@then("this command must give back a value")
+def step_impl(context):
+    assert 'value' in context.eval_value['result']['result'], "The command did not worked as expected."
+    context.client.stop()