iex> JSONPatch.patch(%{"a" => 1}, [
...>   %{"op" => "add", "path" => "/b", "value" => %{"c" => true}},
...>   %{"op" => "test", "path" => "/a", "value" => 1},
...>   %{"op" => "move", "from" => "/b/c", "path" => "/c"}
...> ])
{:ok, %{"a" => 1, "b" => %{}, "c" => true}}

iex> JSONPatch.patch(%{"a" => 22}, [
...>   %{"op" => "add", "path" => "/b", "value" => %{"c" => true}},
...>   %{"op" => "test", "path" => "/a", "value" => 1},
...>   %{"op" => "move", "from" => "/b/c", "path" => "/c"}
...> ])
{:error, :test_failed, ~s|test failed (patches[1], %{"op" => "test", "path" => "/a", "value" => 1})|}

# mix.exs
def deps do
  [
    {:json_patch, "~> 0.8.0"}
  ]
end