def test_pop_from_empty_stack(self):
model = ModifiedStackViewModel()
model.set_pop_size(1)
model.pop()
self.assertEqual('count should be positive', model.get_error_message())
def test_when_pop_size_non_int(self):
model = ModifiedStackViewModel()
model.set_pop_size('AND THEN JUST POP ME')
model.pop()
self.assertEqual('Input contains non int value',
model.get_error_message())
def test_when_pushed_value_non_int(self):
model = ModifiedStackViewModel()
model.set_push_state('One')
model.set_pushed_element('PUSH ME')
model.push()
self.assertEqual('Input contains non int value',
model.get_error_message())
def test_look_top_from_empty_stack(self):
model = ModifiedStackViewModel()
model.get_top()
self.assertEqual('Stack is empty', model.get_error_message())