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i2c_device_test.go
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i2c_device_test.go
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package sysfs
import (
"errors"
"os"
"syscall"
"testing"
"gobot.io/x/gobot/drivers/i2c"
"gobot.io/x/gobot/gobottest"
)
func TestNewI2cDeviceClose(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
gobottest.Assert(t, i.Close(), nil)
}
func TestNewI2cDeviceQueryFuncError(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
SetSyscall(&MockSyscall{
Impl: func(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno) {
return 0, 0, 1
},
})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, errors.New("Querying functionality failed with syscall.Errno operation not permitted"))
}
func TestNewI2cDevice(t *testing.T) {
fs := NewMockFilesystem([]string{})
SetFilesystem(fs)
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice(os.DevNull)
gobottest.Assert(t, err.Error(), " : /dev/null: No such file.")
fs = NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err = NewI2cDevice("/dev/i2c-1")
gobottest.Assert(t, err, nil)
SetSyscall(&MockSyscall{})
i, err = NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
gobottest.Assert(t, i.SetAddress(0xff), nil)
buf := []byte{0x01, 0x02, 0x03}
n, err := i.Write(buf)
gobottest.Assert(t, n, len(buf))
gobottest.Assert(t, err, nil)
buf = make([]byte, 4)
n, err = i.Read(buf)
gobottest.Assert(t, n, 3)
gobottest.Assert(t, err, nil)
}
func TestNewI2cDeviceReadByte(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
i.funcs = I2C_FUNC_SMBUS_READ_BYTE
val, e := i.ReadByte()
gobottest.Assert(t, val, byte(0))
gobottest.Assert(t, e, nil)
}
func TestNewI2cDeviceReadByteError(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
SetSyscall(&MockSyscall{
Impl: func(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno) {
return 0, 0, 1
},
})
i.SetAddress(0xff)
i.funcs = I2C_FUNC_SMBUS_READ_BYTE
_, e := i.ReadByte()
gobottest.Refute(t, e, nil)
}
func TestNewI2cDeviceReadByteNotSupported(t *testing.T) {
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
_, err = i.ReadByte()
gobottest.Assert(t, err.Error(), "SMBus read byte not supported")
}
func TestNewI2cDeviceWriteByte(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
i.funcs = I2C_FUNC_SMBUS_WRITE_BYTE
e := i.WriteByte(0x01)
gobottest.Assert(t, e, nil)
}
func TestNewI2cDeviceWriteByteNotSupported(t *testing.T) {
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
err = i.WriteByte(0x01)
gobottest.Assert(t, err.Error(), "SMBus write byte not supported")
}
func TestNewI2cDeviceReadByteData(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
i.funcs = I2C_FUNC_SMBUS_READ_BYTE_DATA
v, e := i.ReadByteData(0x01)
gobottest.Assert(t, v, byte(0))
gobottest.Assert(t, e, nil)
}
func TestNewI2cDeviceReadByteDataNotSupported(t *testing.T) {
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
_, err = i.ReadByteData(0x01)
gobottest.Assert(t, err.Error(), "SMBus read byte data not supported")
}
func TestNewI2cDeviceWriteByteData(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
i.funcs = I2C_FUNC_SMBUS_WRITE_BYTE_DATA
e := i.WriteByteData(0x01, 0x02)
gobottest.Assert(t, e, nil)
}
func TestNewI2cDeviceWriteByteDataNotSupported(t *testing.T) {
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
err = i.WriteByteData(0x01, 0x01)
gobottest.Assert(t, err.Error(), "SMBus write byte data not supported")
}
func TestNewI2cDeviceReadWordData(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
i.funcs = I2C_FUNC_SMBUS_READ_WORD_DATA
v, e := i.ReadWordData(0x01)
gobottest.Assert(t, v, uint16(0))
gobottest.Assert(t, e, nil)
}
func TestNewI2cDeviceReadWordDataNotSupported(t *testing.T) {
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
_, err = i.ReadWordData(0x01)
gobottest.Assert(t, err.Error(), "SMBus read word data not supported")
}
func TestNewI2cDeviceWriteWordData(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
i.funcs = I2C_FUNC_SMBUS_WRITE_WORD_DATA
e := i.WriteWordData(0x01, 0x0102)
gobottest.Assert(t, e, nil)
}
func TestNewI2cDeviceWriteWordDataNotSupported(t *testing.T) {
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
err = i.WriteWordData(0x01, 0x01)
gobottest.Assert(t, err.Error(), "SMBus write word data not supported")
}
func TestNewI2cDeviceWriteBlockData(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
e := i.WriteBlockData(0x01, []byte{0x01, 0x02, 0x03})
gobottest.Assert(t, e, nil)
}
func TestNewI2cDeviceWriteBlockDataTooMuch(t *testing.T) {
fs := NewMockFilesystem([]string{
"/dev/i2c-1",
})
SetFilesystem(fs)
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
var data []byte
data = make([]byte, 33)
e := i.WriteBlockData(0x01, data)
gobottest.Assert(t, e, errors.New("Writing blocks larger than 32 bytes (33) not supported"))
}
func TestNewI2cDeviceWrite(t *testing.T) {
SetSyscall(&MockSyscall{})
i, err := NewI2cDevice("/dev/i2c-1")
var _ i2c.I2cDevice = i
gobottest.Assert(t, err, nil)
i.SetAddress(0xff)
buf := []byte{0x01, 0x02, 0x03}
n, err := i.Write(buf)
gobottest.Assert(t, n, len(buf))
gobottest.Assert(t, err, nil)
}