code: def test_str_repr():
      assert str(UnitSystem((m, s), name="MS")) == "MS"
      assert str(UnitSystem((m, s))) == "UnitSystem((meter, second))"
  
      assert repr(UnitSystem((m, s))) == "<UnitSystem: (%s, %s)>" % (
          m,
          s,
      )
  
file_path: sympy/sympy/physics/units/tests/test_unitsystem.py
imports: from sympy.physics.units import DimensionSystem, joule, second, ampere
  from sympy.core.numbers import Rational
  from sympy.core.singleton import S
  from sympy.physics.units.definitions import c, kg, m, s
  from sympy.physics.units.definitions.dimension_definitions import length, time
  from sympy.physics.units.quantities import Quantity
  from sympy.physics.units.unitsystem import UnitSystem
  from sympy.physics.units.util import convert_to
label_desc: Use image node_id 2 for calling a global function with example usage: test_str_repr() without return types