Correct AnalogRead in sparkCoreAdaptor

It now returns an int instead of float64, since the interface is
expecting that.

platforms/spark/spark_core_adaptor.go

@@ -3,10 +3,11 @@ package spark
 import (
 	"encoding/json"
 	"fmt"
-	"github.com/hybridgroup/gobot"
 	"io/ioutil"
 	"net/http"
 	"net/url"
+
+	"github.com/hybridgroup/gobot"
 )
 
 type SparkCoreAdaptor struct {
@@ -38,7 +39,7 @@ func (s *SparkCoreAdaptor) Finalize() bool {
 	return true
 }
 
-func (s *SparkCoreAdaptor) AnalogRead(pin string) float64 {
+func (s *SparkCoreAdaptor) AnalogRead(pin string) int {
 	params := url.Values{
 		"params":       {pin},
 		"access_token": {s.AccessToken},
@@ -48,7 +49,7 @@ func (s *SparkCoreAdaptor) AnalogRead(pin string) float64 {
 
 	resp, err := s.postToSpark(url, params)
 	if err == nil {
-		return resp["return_value"].(float64)
+		return int(resp["return_value"].(float64))
 	}
 
 	return 0

platforms/spark/spark_core_adaptor_test.go

@@ -1,11 +1,12 @@
 package spark
 
 import (
-	"github.com/hybridgroup/gobot"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"testing"
+
+	"github.com/hybridgroup/gobot"
 )
 
 // HELPERS
@@ -104,7 +105,7 @@ func TestSparkCoreAdaptorAnalogRead(t *testing.T) {
 
 	a.setAPIServer(testServer.URL)
 
-	gobot.Assert(t, a.AnalogRead("A1"), 5.2)
+	gobot.Assert(t, a.AnalogRead("A1"), 5)
 
 	testServer.Close()
 
@@ -114,7 +115,7 @@ func TestSparkCoreAdaptorAnalogRead(t *testing.T) {
 	})
 	defer testServer.Close()
 
-	gobot.Assert(t, a.AnalogRead("A1"), float64(0))
+	gobot.Assert(t, a.AnalogRead("A1"), 0)
 
 }