test_spacecraftPointMass

Unit tests for the Spacecraft.pointMassTranslationalOnly option.

The point-mass mode should reproduce the normal spacecraft translational motion when no state effectors are attached, while omitting rotational dynamics from the integrated equations of motion.

test_spacecraftPointMass.test_spacecraftPointMass_allowsAttitudeDependentDynamicEffector()

Point-mass mode must expose fixed attitude states for dynamic effectors.

test_spacecraftPointMass.test_spacecraftPointMass_matchesStandardSpacecraftTranslation()

Point-mass mode must match normal spacecraft translational motion.

test_spacecraftPointMass.test_spacecraftPointMass_matchesStandardSpacecraftWithDynamicForce()

Point-mass mode must include translational dynamic-effector forces.

test_spacecraftPointMass.test_spacecraftPointMass_rejectsStateEffectors()

Point-mass mode must reject state effectors because they add internal states.

test_spacecraftPointMass.test_spacecraftPointMass_zeroAccelerationsBeforeIntegration(pointMassMode)

The state message must not hold uninitialized accelerations.

The non-conservative acceleration and the angular acceleration are only computed after an integration step in the 6-DOF mode and never in the point-mass mode. Before that they must be zero, and the angular acceleration must stay zero in the point-mass mode.

Parameters:

pointMassMode (bool) – if True, run the spacecraft in pointMassTranslationalOnly mode