test_login.rb logout if needed

since the test order is random, the successful login test can be
executed before the failure. So we need to logout if we are already
logged between the tests

server/web2py/applications/vidjil/tests/functional/test_login.rb

@@ -8,6 +8,11 @@ class TestLogin < BrowserTest
     if not defined? $b
       set_browser("http://localhost/browser")
     end
+    logout = $b.a(:class => "button", :text => "(logout)")
+    if logout.present?
+      logout.click
+      Watir::Wait.until(30) {$b.execute_script("return jQuery.active") == 0}
+    end
   end
 
 =begin