34 lines
784 B
Elixir
34 lines
784 B
Elixir
defmodule WaferDllTxTest do
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use ExUnit.Case, async: true
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alias Wafer.DLL.Tx
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test "it sends the start byte first" do
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bytes = collect(:test)
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byte = List.first(bytes)
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assert byte == 0x7D
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end
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test "it sends the end byte last" do
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bytes = collect(:test)
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byte = List.last(bytes)
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assert byte == 0x7E
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end
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test "it includes a valid CRC" do
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crc0 = :erlang.crc32(:erlang.term_to_binary(:test))
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<<_start::integer-size(8), crc1::integer-size(32), _::binary>> =
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:binary.list_to_bin(collect(:test))
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assert crc0 == crc1
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end
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defp collect(term), do: collect(Tx.init(term), [])
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defp collect(tx, bytes) do
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case Tx.tx(tx) do
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{:done, _tx} -> Enum.reverse(bytes)
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{byte, tx} -> collect(tx, [byte | bytes])
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end
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end
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end
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