code: def test_represent_hadamard():
      """Test the representation of the hadamard gate."""
      circuit = HadamardGate(0) * Qubit("00")
      answer = represent(circuit, nqubits=2)
      # Check that the answers are same to within an epsilon.
      assert answer == Matrix([sqrt2_inv, sqrt2_inv, 0, 0])
  
imports: from sympy.core.mul import Mul
  from sympy.core.numbers import I, Integer, Rational, pi
  from sympy.core.symbol import Wild, symbols
  from sympy.functions.elementary.exponential import exp
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.matrices import Matrix, ImmutableMatrix
  from sympy.physics.quantum.gate import XGate, YGate, ZGate, random_circuit, CNOT, IdentityGate, H, X, Y, S, T, Z, SwapGate, gate_simp, gate_sort, CNotGate, TGate, HadamardGate, PhaseGate, UGate, CGate
  from sympy.physics.quantum.commutator import Commutator
  from sympy.physics.quantum.anticommutator import AntiCommutator
  from sympy.physics.quantum.represent import represent
  from sympy.physics.quantum.qapply import qapply
  from sympy.physics.quantum.qubit import Qubit, IntQubit, qubit_to_matrix, matrix_to_qubit
  from sympy.physics.quantum.matrixutils import matrix_to_zero
  from sympy.physics.quantum.matrixcache import sqrt2_inv
  from sympy.physics.quantum import Dagger
label_desc: Use image node_id 6 for calling a global function with example usage: test_represent_hadamard() without return types