#511: Add ln_s_order rule

tests/rules/test_ln_no_hard_link.py

@@ -20,7 +20,7 @@ def test_match(script, stderr):
     ("ln a b", "... hard link"),
     ("sudo ln a b", "... hard link"),
     ("a b", error)])
-def test_assert_not_match(script, stderr):
+def test_not_match(script, stderr):
     command = Command(script, stderr=stderr)
     assert not match(command)
 

tests/rules/test_ln_s_order.py

@@ -0,0 +1,41 @@
+import pytest
+from thefuck.rules.ln_s_order import match, get_new_command
+from tests.utils import Command
+
+
+@pytest.fixture
+def file_exists(mocker):
+    return mocker.patch('os.path.exists', return_value=True)
+
+
+get_stderr = "ln: failed to create symbolic link '{}': File exists".format
+
+
+@pytest.mark.usefixtures('file_exists')
+@pytest.mark.parametrize('script', [
+    'ln -s dest source',
+    'ln dest -s source',
+    'ln dest source -s'])
+def test_match(script):
+    stderr = get_stderr('source')
+    assert match(Command(script, stderr=stderr))
+
+
+@pytest.mark.parametrize('script, stderr, exists', [
+    ('ln dest source', get_stderr('source'), True),
+    ('ls -s dest source', get_stderr('source'), True),
+    ('ln -s dest source', '', True),
+    ('ln -s dest source', get_stderr('source'), False)])
+def test_not_match(file_exists, script, stderr, exists):
+    file_exists.return_value = exists
+    assert not match(Command(script, stderr=stderr))
+
+
+@pytest.mark.usefixtures('file_exists')
+@pytest.mark.parametrize('script, result', [
+    ('ln -s dest source', 'ln -s source dest'),
+    ('ln dest -s source', 'ln -s source dest'),
+    ('ln dest source -s', 'ln source -s dest')])
+def test_match(script, result):
+    stderr = get_stderr('source')
+    assert get_new_command(Command(script, stderr=stderr)) == result