56 lines
1.3 KiB
Elixir
56 lines
1.3 KiB
Elixir
defmodule WaferCircuits.SPITest do
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use ExUnit.Case, async: true
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use Mimic
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alias Wafer.Driver.Circuits.SPI, as: Subject
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alias Wafer.Driver.Circuits.SPI.Wrapper
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alias Wafer.SPI
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@moduledoc false
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describe "acquire/1" do
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test "opens the bus" do
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Wrapper
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|> expect(:open, 1, fn bus, opts ->
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assert bus == "spidev0.0"
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assert opts == []
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{:ok, :erlang.make_ref()}
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end)
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assert {:ok, %Subject{}} = Subject.acquire(bus_name: "spidev0.0")
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end
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test "when the bus name is not specified it returns an error" do
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assert {:error, _} = Subject.acquire([])
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end
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end
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describe "release/1" do
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test "closes the bus connection" do
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conn = conn()
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Wrapper
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|> expect(:close, 1, fn ref ->
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assert ref == conn.ref
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:ok
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end)
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assert :ok = Subject.release(conn)
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end
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end
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describe "SPI.transfer/2" do
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test "transfers data to and from the bus" do
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conn = conn()
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Wrapper
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|> expect(:transfer, 1, fn ref, data ->
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assert ref == conn.ref
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assert data == <<0, 0>>
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{:ok, <<1, 1>>}
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end)
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assert {:ok, <<1, 1>>, %Subject{}} = SPI.transfer(conn, <<0, 0>>)
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end
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end
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defp conn, do: %Subject{ref: :erlang.make_ref(), bus: "spidev0.0"}
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end
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