diff --git a/tests/test_parse_args.py b/tests/test_parse_args.py
new file mode 100644
index 0000000..d0b9ebe
--- /dev/null
+++ b/tests/test_parse_args.py
@@ -0,0 +1,60 @@
+from pargv import parse_args
+import pytest
+
+
+def test_io():
+    for (argv, args, kwargs) in (
+        # Arguments
+        ('name',         ['name'],            {}),
+        ('name command', ['name', 'command'], {}),
+        # Hyphens
+        ('a-b',          ['a_b'],             {}),
+        ('---a',         [],                  {'_a': True}),
+        ('-a-',          [],                  {'a': True, '_': True}),
+        # Options
+        ('--option',     [], {'option': True}),
+        ('--option=2',   [], {'option': '2'}),
+        ('--option=2 4', [], {'option': ['2', '4']}),
+        ('--option 2',   [], {'option': '2'}),
+        ('--option 2 4', [], {'option': ['2', '4']}),
+        # Short options
+        ('-o',           [], {'o': True}),
+        ('-o=2',         [], {'o': '2'}),
+        ('-o=2 4',       [], {'o': ['2', '4']}),
+        ('-o 2',         [], {'o': '2'}),
+        ('-o 2 4',       [], {'o': ['2', '4']}),
+        # Multiple short options
+        ('-ox',          [], {'o': True, 'x': True}),
+        ('-ox=2',        [], {'o': True, 'x': '2'}),
+        ('-ox=2 4',      [], {'o': True, 'x': ['2', '4']}),
+        ('-ox 2',        [], {'o': True, 'x': '2'}),
+        ('-ox 2 4',      [], {'o': True, 'x': ['2', '4']}),
+    ):
+        assert parse_args(argv.split()) == (args, kwargs)
+
+def test_empty_input():
+    for argv in (
+        '',
+        [],
+        {},
+        None,
+        False,
+    ):
+        args, kwargs = parse_args(argv)
+        assert (len(args), len(kwargs)) == (1, 0)
+
+def test_type_errors():
+    for argv in (
+        1,
+        True,
+        {'a': 1},
+    ):
+        with pytest.raises(TypeError):
+            parse_args(argv)
+
+def test_attribute_errors():
+    for argv in (
+        [1],
+    ):
+        with pytest.raises(AttributeError):
+            parse_args(argv)