#N/A: Add grep_arguments_order rule

tests/rules/test_grep_arguments_order.py

@@ -0,0 +1,40 @@
+import pytest
+from thefuck.rules.grep_arguments_order import get_new_command, match
+from tests.utils import Command
+
+stderr = 'grep: {}: No such file or directory'.format
+
+
+@pytest.fixture(autouse=True)
+def os_path(monkeypatch):
+    monkeypatch.setattr('os.path.isfile', lambda x: not x.startswith('-'))
+
+
+@pytest.mark.parametrize('script, file', [
+    ('grep test.py test', 'test'),
+    ('grep -lir . test', 'test'),
+    ('egrep test.py test', 'test'),
+    ('egrep -lir . test', 'test')])
+def test_match(script, file):
+    assert match(Command(script, stderr=stderr(file)))
+
+
+@pytest.mark.parametrize('script, stderr', [
+    ('cat test.py', stderr('test')),
+    ('grep test test.py', ''),
+    ('grep -lir test .', ''),
+    ('egrep test test.py', ''),
+    ('egrep -lir test .', '')])
+def test_not_match(script, stderr):
+    assert not match(Command(script, stderr=stderr))
+
+
+@pytest.mark.parametrize('script, stderr, result', [
+    ('grep test.py test', stderr('test'), 'grep test test.py'),
+    ('grep -lir . test', stderr('test'), 'grep -lir test .'),
+    ('grep . test -lir', stderr('test'), 'grep test -lir .'),
+    ('egrep test.py test', stderr('test'), 'egrep test test.py'),
+    ('egrep -lir . test', stderr('test'), 'egrep -lir test .'),
+    ('egrep . test -lir', stderr('test'), 'egrep test -lir .')])
+def test_get_new_command(script, stderr, result):
+    assert get_new_command(Command(script, stderr=stderr)) == result