mock_show returned to unit tests

mock_show returned to unit/test_solidmotor.py

Author: caioessouza

tests/unit/test_solidmotor.py

@@ -20,11 +20,13 @@
 
 
 @patch("matplotlib.pyplot.show")
-def test_motor(cesaroni_m1670):  # pylint: disable=unused-argument
+def test_motor(mock_show, cesaroni_m1670):  # pylint: disable=unused-argument
     """Tests the SolidMotor.all_info() method.
 
     Parameters
     ----------
+    mock_show : mock
+        Mock of the matplotlib.pyplot.show function.
     cesaroni_m1670 : rocketpy.SolidMotor
         The SolidMotor object to be used in the tests.
     """