code: def test_euler_interface():
      x = Function("x")
      y = Symbol("y")
      t = Symbol("t")
      raises(TypeError, lambda: euler())
      raises(TypeError, lambda: euler(D(x(t), t) * y(t), [x(t), y]))
      raises(ValueError, lambda: euler(D(x(t), t) * x(y), [x(t), x(y)]))
      raises(TypeError, lambda: euler(D(x(t), t) ** 2, x(0)))
      raises(TypeError, lambda: euler(D(x(t), t) * y(t), [t]))
      assert euler(D(x(t), t) ** 2 / 2, {x(t)}) == [
          Eq(-D(x(t), t, t), 0)
      ]
      assert euler(D(x(t), t) ** 2 / 2, x(t), {t}) == [
          Eq(-D(x(t), t, t), 0)
      ]
  
file_path: sympy/sympy/calculus/tests/test_euler.py
imports: from sympy.core.function import Derivative, Function
  from sympy.core.relational import Eq
  from sympy.core.symbol import Symbol, symbols
  from sympy.functions.elementary.trigonometric import cos, sin
  from sympy.testing.pytest import raises
  from sympy.calculus.euler import euler_equations
label_desc: Use image node_id 1 for calling a global function with example usage: test_euler_interface() without return types