'Check if node content has changed after selecting target class'

def test_target_class_changed(self):

    self.send_signal(self.signal_name, self.signal_data)
    nodes = self.widget.scene.nodes()
    text = nodes[0].toPlainText()
    self.widget.color_combo.activated.emit(1)
    self.widget.color_combo.setCurrentIndex(1)
    self.assertNotEqual(nodes[0].toPlainText(), text)
