code: def test_valid_constructor(args, kwargs):
      pointA, pointB = args
      instance = LinearPathway(*args, **kwargs)
      assert isinstance(instance, LinearPathway)
      assert hasattr(instance, "attachments")
      assert len(instance.attachments) == 2
      assert instance.attachments[0] is pointA
      assert instance.attachments[1] is pointB
      assert isinstance(instance.attachments[0], Point)
      assert instance.attachments[0].name == "pA"
      assert isinstance(instance.attachments[1], Point)
      assert instance.attachments[1].name == "pB"
  
imports: import pytest
  from sympy import Rational, Symbol, cos, pi, sin, sqrt
  from sympy.physics.mechanics import Force, LinearPathway, ObstacleSetPathway, PathwayBase, Point, ReferenceFrame, WrappingCylinder, WrappingGeometryBase, WrappingPathway, WrappingSphere, dynamicsymbols
  from sympy.simplify.simplify import simplify
label_desc: Use image node_id 2 for calling the TestLinearPathway obj's underlying member method code with example usage: obj.test_valid_constructor(args, kwargs) without return types