Added a rule to delete sudo for pacaur. (#787)

tests/rules/test_unsudo.py

@@ -0,0 +1,22 @@
+import pytest
+from thefuck.rules.unsudo import match, get_new_command
+from thefuck.types import Command
+
+
+@pytest.mark.parametrize('output', [
+    'you cannot perform this operation as root'])
+def test_match(output):
+    assert match(Command('sudo ls', output))
+
+
+def test_not_match():
+    assert not match(Command('', ''))
+    assert not match(Command('sudo ls', 'Permission denied'))
+    assert not match(Command('ls', 'you cannot perform this operation as root'))
+
+
+@pytest.mark.parametrize('before, after', [
+    ('sudo ls', 'ls'),
+    ('sudo pacaur -S helloworld', 'pacaur -S helloworld')])
+def test_get_new_command(before, after):
+    assert get_new_command(Command(before, '')) == after