fix lint errors

machine.go

@@ -38,7 +38,7 @@ func (d *Definition) AddTransition(trigger string, source State, dest State) {
 
 func (d *Definition) GetState(name string) State {
 	var r State
-  for _,s := range(d.states) {
+	for _, s := range d.states {
 		if string(s) == name {
 			return s
 		}

machine_test.go

@@ -3,9 +3,9 @@
 package machine
 
 import (
+	"github.com/stretchr/testify/assert"
 	"log"
 	"testing"
-	"github.com/stretchr/testify/assert"
 )
 
 func setupStater(initial State) Stater {

state.go

@@ -9,4 +9,3 @@ type mState struct {
 func NewState(name string) *mState {
 	return &mState{name: name}
 }
-

transition.go

@@ -3,8 +3,8 @@
 package machine
 
 import (
+	_ "errors"
 	"fmt"
-  "errors"
 )
 
 type Transitioner interface {
@@ -33,7 +33,7 @@ func (r *Transition) Run(m Modeler) error {
 			return nil
 		}
 	}
-  return errors.New(fmt.Sprintf("Transition from %s to %s failed on model state %s", r.source, r.dest, currentState))
+	return fmt.Errorf("Transition from %s to %s failed on model state %s", r.source, r.dest, currentState)
 }
 
 func (r *Transition) Subscribe(s Subscriber) {

transition_test.go

@@ -3,9 +3,9 @@
 package machine
 
 import (
+	"github.com/stretchr/testify/assert"
 	"log"
 	"testing"
-	"github.com/stretchr/testify/assert"
 )
 
 func setupTransition() Transitioner {