Use opts in main().

diceware/diceware.py

 import argparse
 import os
 import re
+import sys
 from random import SystemRandom
 
 
@@ -69,5 +70,7 @@ def get_passphrase(wordnum=6, specials=True, separator='', lang='en',
     return result
 
 
-def main():
-    pass
+def main(args=1):
+    if args is 1:
+        args = sys.argv[1:]
+    options = handle_options(args)

tests/test_diceware.py

@@ -3,6 +3,7 @@ import pytest
 import sys
 from diceware.diceware import (
     SRC_DIR, get_wordlist, get_wordlist_path, get_passphrase, handle_options,
+    main,
     )
 
 
@@ -55,11 +56,17 @@ class TestDicewareModule(object):
         r2 = get_passphrase()
         assert r1 != r2
 
-    def test_handle_options(self, capsys):
+    def test_handle_options(self):
         # we can get help
         with pytest.raises(SystemExit) as exc_info:
             handle_options(['--help'])
         assert exc_info.value.code == 0
+
+    def test_main(self, capsys):
+        # we can get help
+        with pytest.raises(SystemExit) as exc_info:
+            main(['diceware', '--help'])
+        assert exc_info.value.code == 0
         out, err = capsys.readouterr()
         out = out.replace(
             os.path.basename(sys.argv[0]), 'diceware')