code: def test_underflow_boundary():
      # test values close to 2**-1075, the underflow boundary; similar
      # to boundary_tests, except that the random error doesn't scale
      # with n
      for exponent in range(-400, -320):
          base = 10**-exponent // 2**1075
          for j in range(TEST_SIZE):
              digits = base + random.randrange(-1000, 1000)
              s = "{}e{}".format(digits, exponent)
              yield s
  
file_path: cpython/Modules/_decimal/tests/randfloat.py
imports: import random
label_desc: Use image node_id 4 for calling a global function with example usage: test_underflow_boundary() without return types