iotest

Overview ¶

Package iotest contains some test helpers for code relying on golang.org/x/exp/io/i2c.

 func TestMCP4725(t *testing.T)  {
	data := make(chan []byte, 2)
	c := iotest.NewI2CConn()

	// Set the TxFunc.
	c.TxFunc(func(w, _ []byte) error {
		data <- w
		return nil
	})

	conn, _ := i2c.Open(iotest.NewI2CDriver(c), 0x1)
	dac, _  := microchip.NewMCP4725(conn, 5.5)

        // Under the hood SetInputCode calls c.Tx which in turn calls TxFunc defined earlier.
	dac.SetInputCode(0x539, 1)

	assert.Equal(t, []byte{0x5, 0x39}, <-data)
}