MNT: fix pylint errors in the tests module

.github/workflows/linters.yml

@@ -40,4 +40,4 @@ jobs:
       run: flake8 rocketpy/ tests/
     - name: Run pylint
       run: |
-        pylint rocketpy/
+        pylint rocketpy/ tests/

Makefile

@@ -37,7 +37,7 @@ flake8:
 	flake8 rocketpy/ tests/
 
 pylint:
-	-pylint rocketpy --output=.pylint-report.txt
+	-pylint rocketpy/ tests/ --output=.pylint-report.txt
 
 build-docs:
 	cd docs && $(PYTHON) -m pip install -r requirements.txt && make html

rocketpy/utilities.py

@@ -424,6 +424,7 @@ def _flutter_prints(
     print(f"Altitude of minimum Safety Factor: {altitude_min_sf:.3f} m (AGL)\n")
 
 
+# TODO: deprecate and delete this function. Never used and now we have Monte Carlo.
 def create_dispersion_dictionary(filename):
     """Creates a dictionary with the rocket data provided by a .csv file.
     File should be organized in four columns: attribute_class, parameter_name,

tests/acceptance/test_ndrt_2020_rocket.py

@@ -64,19 +64,19 @@ def test_ndrt_2020_rocket_data_asserts_acceptance():
     }
 
     # Environment conditions
-    Env23 = Environment(
+    env = Environment(
         gravity=9.81,
         latitude=41.775447,
         longitude=-86.572467,
         date=(2020, 2, 23, 16),
         elevation=206,
     )
-    Env23.set_atmospheric_model(
+    env.set_atmospheric_model(
         type="Reanalysis",
         file="tests/fixtures/acceptance/NDRT_2020/ndrt_2020_weather_data_ERA5.nc",
         dictionary="ECMWF",
     )
-    Env23.max_expected_height = 2000
+    env.max_expected_height = 2000
 
     # motor information
     L1395 = SolidMotor(
@@ -134,13 +134,13 @@ def test_ndrt_2020_rocket_data_asserts_acceptance():
     )
 
     # Parachute set-up
-    def drogue_trigger(p, h, y):
+    def drogue_trigger(p, h, y):  # pylint: disable=unused-argument
         # p = pressure
         # y = [x, y, z, vx, vy, vz, e0, e1, e2, e3, w1, w2, w3]
         # activate drogue when vz < 0 m/s.
         return True if y[5] < 0 else False
 
-    def main_trigger(p, h, y):
+    def main_trigger(p, h, y):  # pylint: disable=unused-argument
         # p = pressure
         # y = [x, y, z, vx, vy, vz, e0, e1, e2, e3, w1, w2, w3]
         # activate main when vz < 0 m/s and z < 167.64 m (AGL) or 550 ft (AGL)
@@ -164,17 +164,19 @@ def main_trigger(p, h, y):
     )
 
     # Flight
-    Flight23 = Flight(
+    rocketpy_flight = Flight(
         rocket=NDRT2020,
-        environment=Env23,
+        environment=env,
         rail_length=parameters.get("rail_length")[0],
         inclination=parameters.get("inclination")[0],
         heading=parameters.get("heading")[0],
     )
-    df_ndrt_rocketpy = pd.DataFrame(Flight23.z[:, :], columns=["Time", "Altitude"])
-    df_ndrt_rocketpy["Vertical Velocity"] = Flight23.vz[:, 1]
-    # df_ndrt_rocketpy["Vertical Acceleration"] = Flight23.az[:, 1]
-    df_ndrt_rocketpy["Altitude"] -= Env23.elevation
+    df_ndrt_rocketpy = pd.DataFrame(
+        rocketpy_flight.z[:, :], columns=["Time", "Altitude"]
+    )
+    df_ndrt_rocketpy["Vertical Velocity"] = rocketpy_flight.vz[:, 1]
+    # df_ndrt_rocketpy["Vertical Acceleration"] = rocketpy_flight.az[:, 1]
+    df_ndrt_rocketpy["Altitude"] -= env.elevation
 
     # Reading data from the flightData (sensors: Raven)
     df_ndrt_raven = pd.read_csv(
@@ -205,14 +207,14 @@ def main_trigger(p, h, y):
     apogee_time_measured = df_ndrt_raven.loc[
         df_ndrt_raven[" Altitude (Ft-AGL)"].idxmax(), " Time (s)"
     ]
-    apogee_time_simulated = Flight23.apogee_time
+    apogee_time_simulated = rocketpy_flight.apogee_time
 
     assert (
         abs(max(df_ndrt_raven[" Altitude (m-AGL)"]) - max(df_ndrt_rocketpy["Altitude"]))
         / max(df_ndrt_raven[" Altitude (m-AGL)"])
         < 0.015
     )
-    assert (max(velocity_raven_filt) - Flight23.max_speed) / max(
+    assert (max(velocity_raven_filt) - rocketpy_flight.max_speed) / max(
         velocity_raven_filt
     ) < 0.06
     assert (

tests/fixtures/function/function_fixtures.py

@@ -134,7 +134,7 @@ def lambda_quad_func():
     Function
         A lambda function based on a string.
     """
-    func = lambda x: x**2  # pylint: disable=unnecessary-lambda
+    func = lambda x: x**2  # pylint: disable=unnecessary-lambda-assignment
     return Function(
         source=func,
     )

tests/fixtures/motor/solid_motor_fixtures.py

@@ -117,3 +117,28 @@ def dimensionless_cesaroni_m1670(kg, m):  # old name: dimensionless_motor
         coordinate_system_orientation="nozzle_to_combustion_chamber",
     )
     return example_motor
+
+
+@pytest.fixture
+def dummy_empty_motor():
+    # Create a motor with ZERO thrust and ZERO mass to keep the rocket's speed constant
+    # TODO: why don t we use these same values to create EmptyMotor class?
+    return SolidMotor(
+        thrust_source=1e-300,
+        burn_time=1e-10,
+        dry_mass=1.815,
+        dry_inertia=(0.125, 0.125, 0.002),
+        center_of_dry_mass_position=0.317,
+        grains_center_of_mass_position=0.397,
+        grain_number=5,
+        grain_separation=5 / 1000,
+        grain_density=1e-300,
+        grain_outer_radius=33 / 1000,
+        grain_initial_inner_radius=15 / 1000,
+        grain_initial_height=120 / 1000,
+        nozzle_radius=33 / 1000,
+        throat_radius=11 / 1000,
+        nozzle_position=0,
+        interpolation_method="linear",
+        coordinate_system_orientation="nozzle_to_combustion_chamber",
+    )

tests/integration/test_environment.py

@@ -100,7 +100,7 @@ def test_gefs_atmosphere(
 @patch("matplotlib.pyplot.show")
 def test_custom_atmosphere(
     mock_show, example_plain_env
-):  # pylint: disable: unused-argument
+):  # pylint: disable=unused-argument
     """Tests the custom atmosphere model in the environment object.
 
     Parameters
@@ -127,7 +127,7 @@ def test_custom_atmosphere(
 @patch("matplotlib.pyplot.show")
 def test_standard_atmosphere(
     mock_show, example_plain_env
-):  # pylint: disable: unused-argument
+):  # pylint: disable=unused-argument
     """Tests the standard atmosphere model in the environment object.
 
     Parameters
@@ -148,7 +148,7 @@ def test_standard_atmosphere(
 @patch("matplotlib.pyplot.show")
 def test_wyoming_sounding_atmosphere(
     mock_show, example_plain_env
-):  # pylint: disable: unused-argument
+):  # pylint: disable=unused-argument
     """Asserts whether the Wyoming sounding model in the environment
     object behaves as expected with respect to some attributes such
     as pressure, barometric_height, wind_velocity and temperature.
@@ -163,15 +163,14 @@ def test_wyoming_sounding_atmosphere(
 
     # TODO:: this should be added to the set_atmospheric_model() method as a
     #        "file" option, instead of receiving the URL as a string.
-    URL = "http://weather.uwyo.edu/cgi-bin/sounding?region=samer&TYPE=TEXT%3ALIST&YEAR=2019&MONTH=02&FROM=0500&TO=0512&STNM=83779"
+    url = "http://weather.uwyo.edu/cgi-bin/sounding?region=samer&TYPE=TEXT%3ALIST&YEAR=2019&MONTH=02&FROM=0500&TO=0512&STNM=83779"
     # give it at least 5 times to try to download the file
     for i in range(5):
         try:
-            example_plain_env.set_atmospheric_model(type="wyoming_sounding", file=URL)
+            example_plain_env.set_atmospheric_model(type="wyoming_sounding", file=url)
             break
-        except:
-            time.sleep(1)  # wait 1 second before trying again
-            pass
+        except Exception:  # pylint: disable=broad-except
+            time.sleep(2**i)
     assert example_plain_env.all_info() is None
     assert abs(example_plain_env.pressure(0) - 93600.0) < 1e-8
     assert (
@@ -227,7 +226,7 @@ def test_hiresw_ensemble_atmosphere(
 @patch("matplotlib.pyplot.show")
 def test_cmc_atmosphere(
     mock_show, example_spaceport_env
-):  # pylint: disable: unused-argument
+):  # pylint: disable=unused-argument
     """Tests the Ensemble model with the CMC file.
 
     Parameters

tests/integration/test_environment_analysis.py

@@ -10,7 +10,7 @@
 
 @pytest.mark.slow
 @patch("matplotlib.pyplot.show")
-def test_all_info(mock_show, env_analysis):
+def test_all_info(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Test the EnvironmentAnalysis.all_info() method, which already invokes
     several other methods. It is a good way to test the whole class in a first view.
     However, if it fails, it is hard to know which method is failing.
@@ -32,7 +32,7 @@ def test_all_info(mock_show, env_analysis):
 
 @pytest.mark.slow
 @patch("matplotlib.pyplot.show")
-def test_exports(mock_show, env_analysis):
+def test_exports(mock_show, env_analysis):  # pylint: disable=unused-argument
     """Check the export methods of the EnvironmentAnalysis class. It
     only checks if the method runs without errors. It does not check if the
     files are correct, as this would require a lot of work and would be