sysfs: increase test coverage

Signed-off-by: deadprogram <ron@hybridgroup.com>

sysfs/i2c_device_test.go

@@ -7,21 +7,35 @@ import (
 	"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 _ I2cDevice = i
+
+	gobottest.Assert(t, err, nil)
+	gobottest.Assert(t, i.Close(), nil)
+}
+
 func TestNewI2cDevice(t *testing.T) {
 	fs := NewMockFilesystem([]string{})
 	SetFilesystem(fs)
 
 	i, err := NewI2cDevice(os.DevNull)
-	gobottest.Refute(t, err, nil)
+	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.Refute(t, err, nil)
+	gobottest.Assert(t, err, nil)
 
 	SetSyscall(&MockSyscall{})
 
@@ -45,5 +59,98 @@ func TestNewI2cDevice(t *testing.T) {
 
 	gobottest.Assert(t, n, 3)
 	gobottest.Assert(t, err, nil)
-
+}
+
+func TestNewI2cDeviceReadByteNotSupported(t *testing.T) {
+	SetSyscall(&MockSyscall{})
+	i, err := NewI2cDevice("/dev/i2c-1")
+	var _ I2cDevice = i
+
+	gobottest.Assert(t, err, nil)
+
+	i.SetAddress(0xff)
+
+	_, err = i.ReadByte()
+	gobottest.Assert(t, err.Error(), "SMBus read byte not supported")
+}
+
+func TestNewI2cDeviceWriteByteNotSupported(t *testing.T) {
+	SetSyscall(&MockSyscall{})
+	i, err := NewI2cDevice("/dev/i2c-1")
+	var _ 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 TestNewI2cDeviceReadByteDataNotSupported(t *testing.T) {
+	SetSyscall(&MockSyscall{})
+	i, err := NewI2cDevice("/dev/i2c-1")
+	var _ 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 TestNewI2cDeviceWriteByteDataNotSupported(t *testing.T) {
+	SetSyscall(&MockSyscall{})
+	i, err := NewI2cDevice("/dev/i2c-1")
+	var _ 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 TestNewI2cDeviceReadWordDataNotSupported(t *testing.T) {
+	SetSyscall(&MockSyscall{})
+	i, err := NewI2cDevice("/dev/i2c-1")
+	var _ 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 TestNewI2cDeviceWriteWordDataNotSupported(t *testing.T) {
+	SetSyscall(&MockSyscall{})
+	i, err := NewI2cDevice("/dev/i2c-1")
+	var _ 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 TestNewI2cDeviceWrite(t *testing.T) {
+	SetSyscall(&MockSyscall{})
+	i, err := NewI2cDevice("/dev/i2c-1")
+	var _ 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)
 }