code: def test_read(self):
      shell = MockShell()
      f = run.StdInputFile(shell, "stdin")
      shell.push(["one\n", "two\n", ""])
      self.assertEqual(f.read(), "one\ntwo\n")
      shell.push(["one\n", "two\n", ""])
      self.assertEqual(f.read(-1), "one\ntwo\n")
      shell.push(["one\n", "two\n", ""])
      self.assertEqual(f.read(None), "one\ntwo\n")
      shell.push(["one\n", "two\n", "three\n", ""])
      self.assertEqual(f.read(2), "on")
      self.assertEqual(f.read(3), "e\nt")
      self.assertEqual(f.read(10), "wo\nthree\n")
  
      shell.push(["one\n", "two\n"])
      self.assertEqual(f.read(0), "")
      self.assertRaises(TypeError, f.read, 1.5)
      self.assertRaises(TypeError, f.read, "1")
      self.assertRaises(TypeError, f.read, 1, 1)
  
imports: from idlelib import run
  import io
  import sys
  from test.support import captured_output, captured_stderr
  import unittest
  from unittest import mock
  import idlelib
  from idlelib.idle_test.mock_idle import Func
label_desc: Use image node_id 3 for calling the StdInputFilesTest obj's underlying member method code with example usage: obj.test_read() without return types