Behat Test: Plugin administration configuration

Change-Id: I395f46cbff1c67fb6ba96202d1cb79da610ff908

test/behat/features/admin/plugin_administration.feature

+@javascript @core @core_administration
+Feature: Changing the configuration on the plugin administation page
+In order to change the settings on the plugin administration page page
+As an admin
+So I can benefit from the uses of the switches
+
+Scenario: Turning the switches on and off on Internal Search (Bug 1431569)
+ Given I log in as "admin" with password "Password1"
+ And I go to "admin/extensions/pluginconfig.php?plugintype=search&pluginname=internal"
+ # Verifing in on the right page
+ And I should see "Plugin administration: search: internal"
+ # Checking the default
+ And the following fields match these values:
+ | Exact user searches | 1 |
+ # Turning the switch on and off
+ And I set the following fields to these values:
+ | Exact user searches | 0 |
+ # Turning the switch back to default setting
+ And I set the following fields to these values:
+ | Exact user searches | 1 |
+ And I press "Save"