I’ve been doing the Get Started elixir. I’m currently going part 9 of MIX AND OTP, but I am having an error with the Doctests that I cannot fix:
I have this command parser file just as the tutorial tells me:
defmodule KVServer.Command do
@doc ~S"""
Parses the given `line` into a command.
## Examples
iex> KVServer.Command.parse "CREATE shopping\r\n"
{:ok, {:create, "shopping"}}
iex> KVServer.Command.parse "CREATE shopping \r\n"
{:ok, {:create, "shopping"}}
iex> KVServer.Command.parse "PUT shopping milk 1\r\n"
{:ok, {:put, "shopping", "milk", "1"}}
iex> KVServer.Command.parse "GET shopping milk\r\n"
{:ok, {:get, "shopping", "milk"}}
iex> KVServer.Command.parse "DELETE shopping eggs\r\n"
{:ok, {:delete, "shopping", "eggs"}}
Unknown commands or commands with the wrong number of
arguments return an error:
iex> KVServer.Command.parse "UNKNOWN shopping eggs\r\n"
{:error, :unknown_command}
iex> KVServer.Command.parse "GET shopping\r\n"
{:error, :unknown_command}
"""
def parse(line) do
case String.split(line) do
["CREATE", bucket] -> {:ok, {:create, bucket}}
["GET", bucket, key] -> {:ok, {:get, bucket, key}}
["PUT", bucket, key, value] -> {:ok, {:put, bucket, key, value}}
["DELETE", bucket, key] -> {:ok, {:delete, bucket, key}}
_ -> {:error, :unknown_command}
end
end
@doc """
Runs the given command.
"""
def run(command)
def run({:create, bucket}) do
MixTest.Registry.create(MixTest.Registry, bucket)
{:ok, "OK\r\n"}
end
def run({:get, bucket, key}) do
lookup(bucket, fn pid ->
value = MixTest.Bucket.get(pid, key)
{:ok, "#{value}\r\nOK\r\n"}
end)
end
def run({:put, bucket, key, value}) do
lookup(bucket, fn pid ->
MixTest.Bucket.put(pid, key, value)
{:ok, "OK\r\n"}
end)
end
def run({:delete, bucket, key}) do
lookup(bucket, fn pid ->
MixTest.Bucket.delete(pid, key)
{:ok, "OK\r\n"}
end)
end
defp lookup(bucket, callback) do
case MixTest.Registry.lookup(MixTest.Registry, bucket) do
{:ok, pid} -> callback.(pid)
:error -> {:error, :not_found}
end
end
end
Note: MixTest is my module from another application that is under umbrella (KV module in the tutorial).
When I try to run the tests, all the doc tests fail, apparently because it does not recognize a blank space or something that I do not understand.
These are the messages that the console shows me when I run the mix test command:
==> kv_server
1) doctest KVServer.Command.parse/1 (2) (KVServer.CommandTest)
apps/kv_server/test/kv_server/command_test.exs:3
" (column 49, code point U+000D)t: (SyntaxError) lib/kv_server/command.ex:10:49: unexpected token: "
doctest:
iex> KVServer.Command.parse "CREATE shopping \r\n"
{:ok, {:create, "shopping"}}
stacktrace:
lib/kv_server/command.ex:10: KVServer.Command (module)
2) doctest KVServer.Command.parse/1 (3) (KVServer.CommandTest)
apps/kv_server/test/kv_server/command_test.exs:3
" (column 50, code point U+000D)t: (SyntaxError) lib/kv_server/command.ex:13:50: unexpected token: "
doctest:
iex> KVServer.Command.parse "PUT shopping milk 1\r\n"
{:ok, {:put, "shopping", "milk", "1"}}
stacktrace:
lib/kv_server/command.ex:13: KVServer.Command (module)
3) doctest KVServer.Command.parse/1 (4) (KVServer.CommandTest)
apps/kv_server/test/kv_server/command_test.exs:3
" (column 48, code point U+000D)t: (SyntaxError) lib/kv_server/command.ex:16:48: unexpected token: "
doctest:
iex> KVServer.Command.parse "GET shopping milk\r\n"
{:ok, {:get, "shopping", "milk"}}
stacktrace:
lib/kv_server/command.ex:16: KVServer.Command (module)
4) doctest KVServer.Command.parse/1 (6) (KVServer.CommandTest)
apps/kv_server/test/kv_server/command_test.exs:3
" (column 52, code point U+000D)t: (SyntaxError) lib/kv_server/command.ex:25:52: unexpected token: "
doctest:
iex> KVServer.Command.parse "UNKNOWN shopping eggs\r\n"
{:error, :unknown_command}
stacktrace:
lib/kv_server/command.ex:25: KVServer.Command (module)
5) doctest KVServer.Command.parse/1 (7) (KVServer.CommandTest)
apps/kv_server/test/kv_server/command_test.exs:3
" (column 43, code point U+000D)t: (SyntaxError) lib/kv_server/command.ex:28:43: unexpected token: "
doctest:
iex> KVServer.Command.parse "GET shopping\r\n"
{:error, :unknown_command}
stacktrace:
lib/kv_server/command.ex:28: KVServer.Command (module)
6) doctest KVServer.Command.parse/1 (1) (KVServer.CommandTest)
apps/kv_server/test/kv_server/command_test.exs:3
" (column 46, code point U+000D)t: (SyntaxError) lib/kv_server/command.ex:7:46: unexpected token: "
doctest:
iex> KVServer.Command.parse "CREATE shopping\r\n"
{:ok, {:create, "shopping"}}
stacktrace:
lib/kv_server/command.ex:7: KVServer.Command (module)
7) doctest KVServer.Command.parse/1 (5) (KVServer.CommandTest)
apps/kv_server/test/kv_server/command_test.exs:3
" (column 51, code point U+000D)t: (SyntaxError) lib/kv_server/command.ex:19:51: unexpected token: "
doctest:
iex> KVServer.Command.parse "DELETE shopping eggs\r\n"
{:ok, {:delete, "shopping", "eggs"}}
stacktrace:
lib/kv_server/command.ex:19: KVServer.Command (module)
.
Finished in 0.1 seconds (0.1s async, 0.00s sync)
7 doctests, 1 test, 7 failures
