add mistyping support for git lfs

tests/rules/test_git_lfs_mistype.py

@@ -0,0 +1,62 @@
+from thefuck.rules.git_lfs_mistype import match, get_new_command
+from thefuck.types import Command
+
+
+def test_match():
+    err_response = """
+Error: unknown command "evn" for "git-lfs"
+
+Did you mean this?
+	env
+	ext
+
+Run 'git-lfs --help' for usage.
+    """
+    assert match(Command('git lfs evn', err_response))
+
+
+def test_not_match():
+    err_response = 'bash: git: command not found'
+    assert not match(Command('git lfs env', err_response))
+
+
+def test_not_git_command():
+    err_response = """
+Error: unknown command "evn" for "git-lfs"
+
+Did you mean this?
+	env
+	ext
+
+Run 'git-lfs --help' for usage.
+    """
+    assert not match(Command('docker lfs env', err_response))
+
+
+def test_get_new_command():
+    err_response = """
+Error: unknown command "evn" for "git-lfs"
+
+Did you mean this?
+	env
+	ext
+
+Run 'git-lfs --help' for usage.
+    """
+    result = get_new_command(Command('git lfs evn', err_response))
+    expected = 'git lfs env'
+    assert result == expected
+
+
+def test_get_another_new_command():
+    err_response = """
+Error: unknown command "chekout" for "git-lfs"
+
+Did you mean this?
+	checkout
+
+Run 'git-lfs --help' for usage.
+    """
+    result = get_new_command(Command('git lfs chekout', err_response))
+    expected = 'git lfs checkout'
+    assert result == expected