Use parametrized tests where it possible

tests/rules/test_mkdir_p.py

@@ -1,3 +1,4 @@
+import pytest
 from thefuck.rules.mkdir_p import match, get_new_command
 from tests.utils import Command
 
@@ -6,9 +7,14 @@ def test_match():
     assert match(Command('mkdir foo/bar/baz',
                          stderr='mkdir: foo/bar: No such file or directory'),
                  None)
-    assert not match(Command('mkdir foo/bar/baz'), None)
-    assert not match(Command('mkdir foo/bar/baz', stderr='foo bar baz'), None)
-    assert not match(Command(), None)
+
+
+@pytest.mark.parametrize('command', [
+    Command('mkdir foo/bar/baz'),
+    Command('mkdir foo/bar/baz', stderr='foo bar baz'),
+    Command()])
+def test_not_match(command):
+    assert not match(command, None)
 
 
 def test_get_new_command():