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bme280_driver_test.go
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bme280_driver_test.go
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package i2c
import (
"bytes"
"errors"
"strings"
"testing"
"github.com/stretchr/testify/assert"
"gobot.io/x/gobot/v2"
)
// this ensures that the implementation is based on i2c.Driver, which implements the gobot.Driver
// and tests all implementations, so no further tests needed here for gobot.Driver interface
var _ gobot.Driver = (*BME280Driver)(nil)
func initTestBME280WithStubbedAdaptor() (*BME280Driver, *i2cTestAdaptor) {
adaptor := newI2cTestAdaptor()
return NewBME280Driver(adaptor), adaptor
}
func TestNewBME280Driver(t *testing.T) {
var di interface{} = NewBME280Driver(newI2cTestAdaptor())
d, ok := di.(*BME280Driver)
if !ok {
t.Errorf("NewBME280Driver() should have returned a *BME280Driver")
}
assert.NotNil(t, d.Driver)
assert.True(t, strings.HasPrefix(d.Name(), "BMP280"))
assert.Equal(t, 0x77, d.defaultAddress)
assert.Equal(t, uint8(0x03), d.ctrlPwrMode)
assert.Equal(t, BMP280PressureOversampling(0x05), d.ctrlPressOversamp)
assert.Equal(t, BMP280TemperatureOversampling(0x01), d.ctrlTempOversamp)
assert.Equal(t, BME280HumidityOversampling(0x05), d.ctrlHumOversamp)
assert.Equal(t, BMP280IIRFilter(0x00), d.confFilter)
assert.NotNil(t, d.calCoeffs)
}
func TestBME280Options(t *testing.T) {
// This is a general test, that options are applied in constructor by using the common WithBus() option and
// least one of this driver. Further tests for options can also be done by call of "WithOption(val)(d)".
d := NewBME280Driver(newI2cTestAdaptor(), WithBus(2),
WithBME280PressureOversampling(0x01),
WithBME280TemperatureOversampling(0x02),
WithBME280IIRFilter(0x03),
WithBME280HumidityOversampling(0x04))
assert.Equal(t, 2, d.GetBusOrDefault(1))
assert.Equal(t, BMP280PressureOversampling(0x01), d.ctrlPressOversamp)
assert.Equal(t, BMP280TemperatureOversampling(0x02), d.ctrlTempOversamp)
assert.Equal(t, BMP280IIRFilter(0x03), d.confFilter)
assert.Equal(t, BME280HumidityOversampling(0x04), d.ctrlHumOversamp)
}
func TestBME280Measurements(t *testing.T) {
bme280, adaptor := initTestBME280WithStubbedAdaptor()
adaptor.i2cReadImpl = func(b []byte) (int, error) {
buf := new(bytes.Buffer)
// Values produced by dumping data from actual sensor
if adaptor.written[len(adaptor.written)-1] == bmp280RegCalib00 {
buf.Write([]byte{126, 109, 214, 102, 50, 0, 54, 149, 220, 213, 208, 11, 64, 30, 166, 255, 249, 255, 172, 38, 10, 216, 189, 16})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH1 {
buf.Write([]byte{75})
} else if adaptor.written[len(adaptor.written)-1] == bmp280RegTempData {
buf.Write([]byte{129, 0, 0})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH2LSB {
buf.Write([]byte{112, 1, 0, 19, 1, 0, 30})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegHumidityMSB {
buf.Write([]byte{111, 83})
}
copy(b, buf.Bytes())
return buf.Len(), nil
}
_ = bme280.Start()
hum, err := bme280.Humidity()
assert.NoError(t, err)
assert.Equal(t, float32(51.20179), hum)
}
func TestBME280InitH1Error(t *testing.T) {
bme280, adaptor := initTestBME280WithStubbedAdaptor()
adaptor.i2cReadImpl = func(b []byte) (int, error) {
buf := new(bytes.Buffer)
// Values produced by dumping data from actual sensor
if adaptor.written[len(adaptor.written)-1] == bmp280RegCalib00 {
buf.Write([]byte{126, 109, 214, 102, 50, 0, 54, 149, 220, 213, 208, 11, 64, 30, 166, 255, 249, 255, 172, 38, 10, 216, 189, 16})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH1 {
return 0, errors.New("h1 read error")
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH2LSB {
buf.Write([]byte{112, 1, 0, 19, 1, 0, 30})
}
copy(b, buf.Bytes())
return buf.Len(), nil
}
assert.ErrorContains(t, bme280.Start(), "h1 read error")
}
func TestBME280InitH2Error(t *testing.T) {
bme280, adaptor := initTestBME280WithStubbedAdaptor()
adaptor.i2cReadImpl = func(b []byte) (int, error) {
buf := new(bytes.Buffer)
// Values produced by dumping data from actual sensor
if adaptor.written[len(adaptor.written)-1] == bmp280RegCalib00 {
buf.Write([]byte{126, 109, 214, 102, 50, 0, 54, 149, 220, 213, 208, 11, 64, 30, 166, 255, 249, 255, 172, 38, 10, 216, 189, 16})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH1 {
buf.Write([]byte{75})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH2LSB {
return 0, errors.New("h2 read error")
}
copy(b, buf.Bytes())
return buf.Len(), nil
}
assert.ErrorContains(t, bme280.Start(), "h2 read error")
}
func TestBME280HumidityWriteError(t *testing.T) {
bme280, adaptor := initTestBME280WithStubbedAdaptor()
_ = bme280.Start()
adaptor.i2cWriteImpl = func([]byte) (int, error) {
return 0, errors.New("write error")
}
hum, err := bme280.Humidity()
assert.ErrorContains(t, err, "write error")
assert.Equal(t, float32(0.0), hum)
}
func TestBME280HumidityReadError(t *testing.T) {
bme280, adaptor := initTestBME280WithStubbedAdaptor()
_ = bme280.Start()
adaptor.i2cReadImpl = func([]byte) (int, error) {
return 0, errors.New("read error")
}
hum, err := bme280.Humidity()
assert.ErrorContains(t, err, "read error")
assert.Equal(t, float32(0.0), hum)
}
func TestBME280HumidityNotEnabled(t *testing.T) {
bme280, adaptor := initTestBME280WithStubbedAdaptor()
adaptor.i2cReadImpl = func(b []byte) (int, error) {
buf := new(bytes.Buffer)
// Values produced by dumping data from actual sensor
if adaptor.written[len(adaptor.written)-1] == bmp280RegCalib00 {
buf.Write([]byte{126, 109, 214, 102, 50, 0, 54, 149, 220, 213, 208, 11, 64, 30, 166, 255, 249, 255, 172, 38, 10, 216, 189, 16})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH1 {
buf.Write([]byte{75})
} else if adaptor.written[len(adaptor.written)-1] == bmp280RegTempData {
buf.Write([]byte{129, 0, 0})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegCalibDigH2LSB {
buf.Write([]byte{112, 1, 0, 19, 1, 0, 30})
} else if adaptor.written[len(adaptor.written)-1] == bme280RegHumidityMSB {
buf.Write([]byte{0x80, 0x00})
}
copy(b, buf.Bytes())
return buf.Len(), nil
}
_ = bme280.Start()
hum, err := bme280.Humidity()
assert.ErrorContains(t, err, "Humidity disabled")
assert.Equal(t, float32(0.0), hum)
}
func TestBME280_initializationBME280(t *testing.T) {
bme280, adaptor := initTestBME280WithStubbedAdaptor()
readCallCounter := 0
adaptor.i2cReadImpl = func(b []byte) (int, error) {
readCallCounter++
if readCallCounter == 1 {
// Simulate returning 24 bytes for the coefficients (register bmp280RegCalib00)
return 24, nil
}
if readCallCounter == 2 {
// Simulate returning a single byte for the hc.h1 value (register bme280RegCalibDigH1)
return 1, nil
}
if readCallCounter == 3 {
// Simulate returning 7 bytes for the coefficients (register bme280RegCalibDigH2LSB)
return 7, nil
}
if readCallCounter == 4 {
// Simulate returning 1 byte for the cmr (register bmp280RegControl)
return 1, nil
}
return 0, nil
}
assert.NoError(t, bme280.Start())
}