Add sysfs tests

Makefile

@@ -1,4 +1,4 @@
-PACKAGES := gobot gobot/api gobot/platforms/intel-iot/edison $(shell ls ./platforms | sed -e 's/^/gobot\/platforms\//')
+PACKAGES := gobot gobot/api gobot/platforms/intel-iot/edison gobot/sysfs $(shell ls ./platforms | sed -e 's/^/gobot\/platforms\//')
 
 .PHONY: test cover robeaux
 

scripts/travis.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-PACKAGES=('gobot' 'gobot/api' 'gobot/platforms/intel-iot/edison' $(ls ./platforms | sed -e 's/^/gobot\/platforms\//'))
+PACKAGES=('gobot' 'gobot/api' 'gobot/platforms/intel-iot/edison' 'gobot/sysfs' $(ls ./platforms | sed -e 's/^/gobot\/platforms\//'))
 EXITCODE=0
 
 echo "mode: count" > profile.cov

sysfs/digital_pin.go

@@ -53,7 +53,7 @@ func (d *DigitalPin) Write(b int) error {
 
 // Read reads the current value of the pin
 func (d *DigitalPin) Read() (n int, err error) {
-	buf, err := ioutil.ReadFile(fmt.Sprintf("%v/%v/value", GPIOPATH, d.label))
+	buf, err := readFile(fmt.Sprintf("%v/%v/value", GPIOPATH, d.label))
 	if err != nil {
 		return
 	}
@@ -72,13 +72,16 @@ func (d *DigitalPin) Unexport() error {
 	return err
 }
 
-// writeFile validates file existence and writes data into it
-func writeFile(name string, data []byte) (i int, err error) {
-	file, err := os.OpenFile(name, os.O_WRONLY, 0644)
+var writeFile = func(path string, data []byte) (i int, err error) {
+	file, err := os.OpenFile(path, os.O_WRONLY, 0644)
 	defer file.Close()
 	if err != nil {
 		return
 	}
 
 	return file.Write(data)
 }
+
+var readFile = func(path string) (b []byte, err error) {
+	return ioutil.ReadFile(path)
+}

sysfs/digital_pin_test.go

@@ -0,0 +1,59 @@
+package sysfs
+
+import (
+	"testing"
+
+	"github.com/hybridgroup/gobot"
+)
+
+func TestDigitalPin(t *testing.T) {
+	lastPath := ""
+	lastData := []byte{}
+
+	writeFile = func(path string, data []byte) (i int, err error) {
+		lastPath = path
+		lastData = data
+		return
+	}
+
+	readFile = func(path string) (b []byte, err error) {
+		lastPath = path
+		return []byte("0"), nil
+	}
+
+	pin := NewDigitalPin(10, "custom")
+	gobot.Assert(t, pin.pin, "10")
+	gobot.Assert(t, pin.label, "custom")
+
+	pin = NewDigitalPin(10)
+	gobot.Assert(t, pin.label, "gpio10")
+
+	pin.Unexport()
+	gobot.Assert(t, lastPath, "/sys/class/gpio/unexport")
+	gobot.Assert(t, string(lastData), "10")
+
+	pin.Export()
+	gobot.Assert(t, lastPath, "/sys/class/gpio/export")
+	gobot.Assert(t, string(lastData), "10")
+
+	pin.Write(1)
+	gobot.Assert(t, lastPath, "/sys/class/gpio/gpio10/value")
+	gobot.Assert(t, string(lastData), "1")
+
+	pin.Write(1)
+	gobot.Assert(t, lastPath, "/sys/class/gpio/gpio10/value")
+	gobot.Assert(t, string(lastData), "1")
+
+	pin.SetDirection(IN)
+	gobot.Assert(t, lastPath, "/sys/class/gpio/gpio10/direction")
+	gobot.Assert(t, string(lastData), "in")
+
+	pin.Direction()
+	gobot.Assert(t, pin.direction, "in")
+	pin.SetDirection(OUT)
+	gobot.Assert(t, pin.direction, "out")
+
+	data, _ := pin.Read()
+	gobot.Assert(t, data, 0)
+	gobot.Assert(t, lastPath, "/sys/class/gpio/gpio10/value")
+}

sysfs/i2c_device_test.go

@@ -0,0 +1,12 @@
+package sysfs
+
+import (
+	"io"
+	"os"
+	"testing"
+)
+
+func TestNewI2cDevice(t *testing.T) {
+	i, _ := NewI2cDevice(os.DevNull, 0xff)
+	var _ io.ReadWriteCloser = i
+}