Fix code style issues with Black

tests/conftest.py

@@ -12,11 +12,12 @@
     "tests.fixtures.parachutes.parachute_fixtures",
     "tests.fixtures.rockets.rocket_fixtures",
     "tests.fixtures.surfaces.surface_fixtures",
-    "tests.fixtures.units.numerical_fixtures"
+    "tests.fixtures.units.numerical_fixtures",
 ]
 
 #
 
+
 def pytest_addoption(parser):
     """Add option to run slow tests. This is used to skip slow tests by default.
 
@@ -76,5 +77,3 @@ def pytest_collection_modifyitems(config, items):
 
 
 ## Functions
-
-

tests/fixtures/environment/environment_fixtures.py

@@ -70,4 +70,4 @@ def env_analysis():
         max_expected_altitude=None,
     )
 
-    return env_analysis
+    return env_analysis

tests/fixtures/function/function_fixtures.py

@@ -137,4 +137,4 @@ def lambda_quad_func():
     func = lambda x: x**2
     return Function(
         source=func,
-    )
+    )

tests/fixtures/hybrid/hybrid_fixtures.py

@@ -1,9 +1,17 @@
 import numpy as np
 import pytest
 
-from rocketpy import (CylindricalTank, Fluid, Function, HybridMotor,
-                      LevelBasedTank, LiquidMotor, MassBasedTank,
-                      SphericalTank, UllageBasedTank)
+from rocketpy import (
+    CylindricalTank,
+    Fluid,
+    Function,
+    HybridMotor,
+    LevelBasedTank,
+    LiquidMotor,
+    MassBasedTank,
+    SphericalTank,
+    UllageBasedTank,
+)
 
 
 @pytest.fixture

tests/fixtures/motor/motor_fixtures.py

@@ -6,7 +6,6 @@
 ## Motors and rockets
 
 
-
 @pytest.fixture
 def cesaroni_m1670():  # old name: solid_motor
     """Create a simple object of the SolidMotor class to be used in the tests.
@@ -141,4 +140,4 @@ def generic_motor():
         dry_inertia=(0.2, 0.2, 0.08),
     )
 
-    return motor
+    return motor

tests/fixtures/rockets/rocket_fixtures.py

@@ -275,4 +275,4 @@ def dimensionless_calisto(kg, m, dimensionless_cesaroni_m1670):
         coordinate_system_orientation="tail_to_nose",
     )
     example_rocket.add_motor(dimensionless_cesaroni_m1670, position=(-1.373) * m)
-    return example_rocket
+    return example_rocket

tests/fixtures/surfaces/surface_fixtures.py

@@ -76,4 +76,3 @@ def calisto_rail_buttons():
         angular_position=45,
         name="Rail Buttons",
     )
-

tests/fixtures/units/numerical_fixtures.py

@@ -25,4 +25,4 @@ def kg():
     numericalunits.kg
         A simple object of the numericalunits.kg class
     """
-    return numericalunits.kg
+    return numericalunits.kg