101 lines
2.4 KiB
Go
101 lines
2.4 KiB
Go
package spi
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import (
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"fmt"
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"strings"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"gobot.io/x/gobot/v2"
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"gobot.io/x/gobot/v2/drivers/aio"
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)
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// this ensures that the implementation is based on spi.Driver, which implements the gobot.Driver
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// and tests all implementations, so no further tests needed here for gobot.Driver interface
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var _ gobot.Driver = (*MCP3204Driver)(nil)
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// must implement the AnalogReader interface
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var _ aio.AnalogReader = (*MCP3204Driver)(nil)
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func initTestMCP3204DriverWithStubbedAdaptor() (*MCP3204Driver, *spiTestAdaptor) {
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a := newSpiTestAdaptor()
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d := NewMCP3204Driver(a)
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if err := d.Start(); err != nil {
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panic(err)
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}
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return d, a
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}
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func TestNewMCP3204Driver(t *testing.T) {
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var di interface{} = NewMCP3204Driver(newSpiTestAdaptor())
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d, ok := di.(*MCP3204Driver)
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if !ok {
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require.Fail(t, "NewMCP3204Driver() should have returned a *MCP3204Driver")
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}
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assert.NotNil(t, d.Driver)
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assert.True(t, strings.HasPrefix(d.Name(), "MCP3204"))
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}
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func TestMCP3204Read(t *testing.T) {
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tests := map[string]struct {
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chanNum int
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simRead []byte
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want int
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wantWritten []byte
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wantErr error
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}{
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"number_negative_error": {
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chanNum: -1,
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wantErr: fmt.Errorf("Invalid channel '-1' for read"),
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},
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"number_0_ok": {
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chanNum: 0,
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simRead: []byte{0xFF, 0xFF, 0xFF},
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wantWritten: []byte{0x06, 0x00, 0x00},
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want: 0x0FFF,
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},
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"number_1_ok": {
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chanNum: 1,
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simRead: []byte{0xFF, 0xFE, 0xFF},
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wantWritten: []byte{0x06, 0x40, 0x00},
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want: 0x0EFF,
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},
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"number_3_ok": {
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chanNum: 3,
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simRead: []byte{0xFF, 0xF3, 0x21},
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wantWritten: []byte{0x06, 0xC0, 0x00},
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want: 0x0321,
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},
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"number_4_error": {
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chanNum: 4,
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wantErr: fmt.Errorf("Invalid channel '4' for read"),
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},
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}
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for name, tc := range tests {
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t.Run(name, func(t *testing.T) {
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// arrange
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d, a := initTestMCP3204DriverWithStubbedAdaptor()
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a.spi.SetSimRead(tc.simRead)
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// act
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got, err := d.Read(tc.chanNum)
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// assert
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assert.Equal(t, tc.wantErr, err)
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assert.Equal(t, tc.want, got)
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assert.Equal(t, tc.wantWritten, a.spi.Written())
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})
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}
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}
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func TestMCP3204ReadWithError(t *testing.T) {
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// arrange
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d, a := initTestMCP3204DriverWithStubbedAdaptor()
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a.spi.SetReadError(true)
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// act
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got, err := d.Read(0)
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// assert
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require.ErrorContains(t, err, "error while SPI read in mock")
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assert.Equal(t, 0, got)
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}
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