code: def test_invalid_cases(self):
      if self.nrhs is None or self.nrhs == 1:
          raise unittest.SkipTest()
      ng_a = self.a.reshape(1, self.n, self.n)
      with pytest.raises(ValueError):
          lapack.gesv(ng_a, self.b)
      ng_b = self.b.reshape(1, self.n, self.nrhs)
      with pytest.raises(ValueError):
          lapack.gesv(self.a, ng_b)
      ng_a = cupy.ones((self.n, self.n + 1), dtype=self.dtype)
      with pytest.raises(ValueError):
          lapack.gesv(ng_a, self.b)
      ng_a = cupy.ones((self.n + 1, self.n + 1), dtype=self.dtype)
      with pytest.raises(ValueError):
          lapack.gesv(ng_a, self.b)
      ng_a = cupy.ones(self.a.shape, dtype="i")
      with pytest.raises(TypeError):
          lapack.gesv(ng_a, self.b)
      ng_a = cupy.ones(
          (2, self.n, self.n), dtype=self.dtype, order="F"
      )[0]
      with pytest.raises(ValueError):
          lapack.gesv(ng_a, self.b)
      ng_b = self.b.copy(order="C")
      with pytest.raises(ValueError):
          lapack.gesv(self.a, ng_b)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  import cupyx
  from cupyx import cusolver, lapack
label_desc: Use image node_id 5 for calling the TestGesv obj's underlying member method code with example usage: obj.test_invalid_cases() without return types