Improve test coverage of util.parse_address() (#1629)

tests/test_util.py

@@ -3,10 +3,25 @@
 # This file is part of gunicorn released under the MIT license.
 # See the NOTICE for more information.
 
+import pytest
+
 from gunicorn import util
 
 
-def test_parse_address():
-    # Test unix socket addresses (PR #1623)
-    assert util.parse_address('unix://var/run/test.sock') == 'var/run/test.sock'
-    assert util.parse_address('unix:/var/run/test.sock') == '/var/run/test.sock'
+@pytest.mark.parametrize('test_input, expected', [
+    ('unix://var/run/test.sock', 'var/run/test.sock'),
+    ('unix:/var/run/test.sock', '/var/run/test.sock'),
+    ('', ('0.0.0.0', 8000)),
+    ('[::1]:8000', ('::1', 8000)),
+    ('localhost:8000', ('localhost', 8000)),
+    ('127.0.0.1:8000', ('127.0.0.1', 8000)),
+    ('localhost', ('localhost', 8000))
+])
+def test_parse_address(test_input, expected):
+    assert util.parse_address(test_input) == expected
+
+
+def test_parse_address_invalid():
+    with pytest.raises(RuntimeError) as err:
+        util.parse_address('127.0.0.1:test')
+    assert "'test' is not a valid port number." in str(err)