rename LogExporter to FakeExporter, expose it only in tests

Readme.md

@@ -18,3 +18,14 @@ eventexporter is a library to export events to 3rd party services.
 
     client := eventexporter.NewSegementIOExporter(key, size)
     client.Send(event)
+
+FakeExporter is a implementation of Exporter to be used in tests.
+
+    import "github.com/koding/eventexporter_test"
+
+    event := &eventexporter.Event{Name: "test event"}
+
+    client := eventexporter.NewFakeExporter()
+    client.Send(event)
+
+    fmt.Println(client.Events)

eventexporter.go

@@ -7,7 +7,6 @@ const (
 
 // Exporter is the interface to export events to a 3rd party service.
 // Currently third party services: SegementIO and Sendgrid are implemented.
-// LogExporter also implements the interface, meant for testing purposes.
 type Exporter interface {
 	Send(*Event) error
 }

eventexporter_test.go

@@ -0,0 +1,35 @@
+package eventexporter_test
+
+import (
+	"testing"
+
+	"github.com/koding/eventexporter"
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+type FakeExporter struct {
+	Events []*eventexporter.Event
+}
+
+func NewFakeExporter() *FakeExporter {
+	return &FakeExporter{Events: []*eventexporter.Event{}}
+}
+
+func (l *FakeExporter) Send(event *eventexporter.Event) error {
+	l.Events = append(l.Events, event)
+	return nil
+}
+
+func TestFakeExporter(t *testing.T) {
+	Convey("When using FakeExporter", t, func() {
+		event := &eventexporter.Event{Name: "test"}
+
+		fakeExporter := NewFakeExporter()
+		err := fakeExporter.Send(event)
+
+		Convey("Then it should save event for debugging", func() {
+			So(err, ShouldBeNil)
+			So(len(fakeExporter.Events), ShouldEqual, 1)
+		})
+	})
+}