Added tests for the Timer

cmd/root.go

@@ -36,6 +36,16 @@ openhue controls your Philips Hue lighting system
 		},
 	}
 
+	cmd.AddGroup(&cobra.Group{
+		ID:    string(OpenHueCmdGroupConfig),
+		Title: "Configuration",
+	})
+
+	cmd.AddGroup(&cobra.Group{
+		ID:    string(OpenHueCmdGroupHue),
+		Title: "Philips Hue",
+	})
+
 	return cmd
 }
 
@@ -66,9 +76,6 @@ func Execute(buildInfo *openhue.BuildInfo) {
 	// create the root command
 	root := NewCmdOpenHue(ctx)
 
-	// init groups
-	initGroups(root)
-
 	// add sub commands
 	root.AddCommand(version.NewCmdVersion(ctx))
 	root.AddCommand(setup.NewCmdAuth(ctx.Io))
@@ -83,19 +90,8 @@ func Execute(buildInfo *openhue.BuildInfo) {
 	cobra.CheckErr(err)
 }
 
-func initGroups(rootCmd *cobra.Command) {
-	rootCmd.AddGroup(&cobra.Group{
-		ID:    string(OpenHueCmdGroupConfig),
-		Title: "Configuration",
-	})
-
-	rootCmd.AddGroup(&cobra.Group{
-		ID:    string(OpenHueCmdGroupHue),
-		Title: "Philips Hue",
-	})
-}
-
-// isCmdInGroup verifies if a given cobra.Command belongs to a certain OpenHueCmdGroup
+// isCmdInGroup verifies if a given cobra.Command belongs to a certain OpenHueCmdGroup.
+// This function will recursively command parents until the root one (e.g. parent is nil)
 func isCmdInGroup(cmd *cobra.Command, id OpenHueCmdGroup) bool {
 
 	if cmd.GroupID == string(id) {

util/metrics.go

@@ -2,10 +2,12 @@ package util
 
 import "time"
 
+// NewTimer creates a new started Timer
 func NewTimer() *Timer {
 	return new(Timer).start()
 }
 
+// Timer can be used to monitor the execution time of a given method
 type Timer struct {
 	t0 time.Time
 }
@@ -15,6 +17,13 @@ func (t *Timer) start() *Timer {
 	return t
 }
 
+// Reset sets the Timer initial time to time.Now()
+func (t *Timer) Reset() *Timer {
+	t.t0 = time.Now()
+	return t
+}
+
+// SinceInMillis returns the elapsed time in milliseconds since the Timer was started or Reset
 func (t *Timer) SinceInMillis() int64 {
 	return time.Since(t.t0).Milliseconds()
 }

util/metrics_test.go

@@ -0,0 +1,17 @@
+package util
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+	"time"
+)
+
+func TestNewTimer(t *testing.T) {
+	timer := NewTimer()
+	assert.NotNil(t, timer)
+	time.Sleep(1 * time.Millisecond)
+	assert.True(t, timer.SinceInMillis() >= 1, "we slept for 1 millis")
+	timer.Reset()
+	time.Sleep(2 * time.Millisecond)
+	assert.True(t, timer.SinceInMillis() >= 2, "we slept for 2 millis")
+}