Fix Robot tests

Author: rikurauhala

src/stub_io.py

@@ -23,7 +23,7 @@ def give_command(self, command_input):
         self.inputs.append(command_input)
 
     # pylint: disable=unused-argument
-    def input_int(self, command_input):
+    def input_check_int(self, command_input):
         integer = self.inputs.pop(0)
         if integer.isnumeric():
             return int(integer)

src/tests/reference.robot

@@ -29,7 +29,7 @@ Store References In Database
     Input Quit Command
     Run Application
     Output Should Contain  1: Philip Pullman | Kultainen Kompassi | Tammi (1996)
-    Output Should Contain  2: George R. R. Martin | Tuf Voyaging | Meisha Merlin (2003)
+    Output Should Contain  3: George R. R. Martin | Tuf Voyaging | Meisha Merlin (2003)
 
 Delete References In Database
     Input New Reference Command
@@ -57,4 +57,3 @@ Export References Into Bibtex File
 *** Keywords ***
 Clear Database
     Format Database
-