add 2 test for cahout (#54)

Scenario: Shopping cart: cashier cash flow - pay
Scenario: Shopping cart: cashier cash flow - cashback

tests/behat/shopping_cart_cashier_manage.feature

@@ -0,0 +1,66 @@
+@local @local_shopping_cart @javascript
+
+Feature: Manage cash flow for cashiers
+  In order to manage cash flowas a cashier I add / reduce / transfer cash.
+
+  Background:
+    Given the following "users" exist:
+      | username | firstname | lastname     | email                       |
+      | user1    | Username1  | Test        | toolgenerator1@example.com  |
+      | user2    | Username2  | Test        | toolgenerator2@example.com  |
+      | teacher  | Teacher    | Test        | toolgenerator3@example.com  |
+      | manager  | Manager    | Test        | toolgenerator4@example.com  |
+    And the following "courses" exist:
+      | fullname | shortname |
+      | Course 1 | C1        |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | user1    | C1     | student        |
+      | user2    | C1     | student        |
+      | teacher  | C1     | editingteacher |
+    And the following "core_payment > payment accounts" exist:
+      | name           |
+      | Account1       |
+    And the following "local_shopping_cart > payment gateways" exist:
+      | account  | gateway | enabled | config                                                                                |
+      | Account1 | paypal  | 1       | {"brandname":"Test paypal","clientid":"Test","secret":"Test","environment":"sandbox"} |
+    And I log in as "admin"
+    And I set the following administration settings values:
+      | Payment account                                    | Account1 |
+    And I log out
+
+  @javascript
+  Scenario: Shopping cart: cashier cash flow - pay
+    Given I log in as "admin"
+    And I visit "/local/shopping_cart/cashier.php"
+    ## When I click on "Cash transactions" "text"
+    When I click on ".shopping-cart-cashout-button" "css_element"
+    And I wait until the page is ready
+    And I set the field "Amount of cash transation" to "30"
+    And I set the field "Reason for the transaction" to "cash payment"
+    And I press "Save changes"
+    And I wait until the page is ready
+    Then I should see "Cash transaction successful"
+    And I follow "Cash report"
+    And I wait until the page is ready
+    And I should see "30.00" in the "#cash_report_table_r1" "css_element"
+    And I should see "cash payment" in the "#cash_report_table_r1" "css_element"
+    And "//*[@id='cash_report_table_r2']" "xpath_element" should not exist
+
+  @javascript
+  Scenario: Shopping cart: cashier cash flow - cashback
+    Given I log in as "admin"
+    And I visit "/local/shopping_cart/cashier.php"
+    ## When I click on "Cash transactions" "text"
+    When I click on ".shopping-cart-cashout-button" "css_element"
+    And I wait until the page is ready
+    And I set the field "Amount of cash transation" to "-20"
+    And I set the field "Reason for the transaction" to "cashback"
+    And I press "Save changes"
+    And I wait until the page is ready
+    Then I should see "Cash transaction successful"
+    And I follow "Cash report"
+    And I wait until the page is ready
+    And I should see "-20.00" in the "#cash_report_table_r1" "css_element"
+    And I should see "cashback" in the "#cash_report_table_r1" "css_element"
+    And "//*[@id='cash_report_table_r2']" "xpath_element" should not exist