old_contents: # test_sf.py
  import unittest
  import io
  import sys
  import subprocess
  
  class TestSf(unittest.TestCase):
      """
      Test TestSf
      """
  
      def execute(self, command):
          proc = subprocess.Popen(
             command,
             stdout = subprocess.PIPE,
             stderr = subprocess.PIPE,
          )
          out,err = proc.communicate()
          return out, err, proc.returncode
  
      def test_help_arg_should_print_help_and_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-h"])
          self.assertIn(b"show this help message and exit", out)
          self.assertEqual(b"", err)
          self.assertEqual(0, code)
  
  if __name__ == '__main__':
      unittest.main()
  
  
new_contents: # test_sf.py
  import unittest
  import io
  import sys
  import subprocess
  
  class TestSf(unittest.TestCase):
      """
      Test TestSf
      """
  
      default_types = [
        ""
      ]
  
      default_modules = [
        "sfp_binstring",
        "sfp_company",
        "sfp_cookie",
        "sfp_countryname",
        "sfp_creditcard",
        "sfp_email",
        "sfp_errors",
        "sfp_ethereum",
        "sfp_filemeta",
        "sfp_hashes",
        "sfp_iban",
        "sfp_names",
        "sfp_pageinfo",
        "sfp_phone",
        "sfp_webanalytics"
      ]
  
      def execute(self, command):
          proc = subprocess.Popen(
             command,
             stdout = subprocess.PIPE,
             stderr = subprocess.PIPE,
          )
          out,err = proc.communicate()
          return out, err, proc.returncode
  
      def test_help_arg_should_print_help_and_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-h"])
          self.assertIn(b"show this help message and exit", out)
          self.assertEqual(b"", err)
          self.assertEqual(0, code)
  
      def test_modules_arg_should_print_modules_and_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-M"])
          self.assertIn(b"Modules available:", out)
          self.assertEqual(b"", err)
          self.assertEqual(0, code)
  
      def test_types_arg_should_print_types_and_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-T"])
          self.assertIn(b"Types available:", out)
          self.assertEqual(b"", err)
          self.assertEqual(0, code)
  
      def test_run_scan_with_modules_no_target_should_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-m", ",".join(self.default_modules)])
          self.assertIn(b"You must specify a target when running in scan mode", out)
          self.assertEqual(b"", err)
          self.assertEqual(255, code)
  
      def test_run_scan_with_types_no_target_should_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-t", ",".join(self.default_types)])
          self.assertIn(b"You must specify a target when running in scan mode", out)
          self.assertEqual(b"", err)
          self.assertEqual(255, code)
  
      def test_run_scan_with_invalid_module_should_run_scan_and_exit(self):
          module = "invalid module"
          out, err, code = self.execute([sys.executable, "sf.py", "-m", module, "-s", "spiderfoot.net"])
          self.assertIn(b"Failed to load module:", out)
          self.assertEqual(b"", err)
          self.assertEqual(0, code)
  
      def test_run_scan_with_invalid_type_should_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-t", "invalid type", "-s", "spiderfoot.net"])
          self.assertIn(b"Based on your criteria, no modules were enabled", out)
          self.assertEqual(b"", err)
          self.assertEqual(255, code)
  
      def test_run_scan_with_modules_should_run_scan_and_exit(self):
          out, err, code = self.execute([sys.executable, "sf.py", "-m", ",".join(self.default_modules), "-s", "spiderfoot.net"])
          self.assertIn(b"Scan completed with status FINISHED", out)
          self.assertEqual(b"", err)
          self.assertEqual(0, code)
  
          for module in self.default_modules:
              with self.subTest(module=module):
                  self.assertIn(module.encode(), out)
  
  if __name__ == '__main__':
      unittest.main()
  
  
subject: update test_sf unit tests