Let main generate passphrases.

diceware/diceware.py

@@ -77,3 +77,4 @@ def main(args=1):
     if args is 1:
         args = sys.argv[1:]
     options = handle_options(args)
+    print(get_passphrase(wordnum=options.num))

tests/test_diceware.py

@@ -67,7 +67,7 @@ class TestDicewareModule(object):
         options = handle_options([])
         assert options.num == 6
 
-    def test_main(self, capsys):
+    def test_main_help(self, capsys):
         # we can get help
         with pytest.raises(SystemExit) as exc_info:
             main(['diceware', '--help'])
@@ -84,3 +84,12 @@ class TestDicewareModule(object):
             '  -h, --help         show this help message and exit\n'
             '  -n NUM, --num NUM  number of words to concatenate. Default: 6\n'
             )
+
+    def test_main(self, capsys):
+        # we can get a passphrase
+        main([])  # call with default options in place
+        out, err = capsys.readouterr()
+        assert err == ''               # we got no errors
+        assert out[-1] == '\n'         # output ends with liebreak
+        assert not ('\n' in out[:-1])  # we get one line
+        assert len(out) > 5            # we get at least some chars