update exercise6

Author: talgat-ruby

exercise6/problem7/README.md

@@ -1,3 +1,5 @@
 # Problem 7
 
-`runTasks` need to initialize some conf and we need to run it only once.
+Identify the data race in `task`. Fix the issue.
+
+NOTE: don't forget to run test with `-race` flag

exercise6/problem7/problem7.go

@@ -6,14 +6,12 @@ import (
 	"time"
 )
 
-//TODO: identify the data race
-// fix the issue.
-
 func task() {
 	start := time.Now()
 	var t *time.Timer
 	t = time.AfterFunc(
-		randomDuration(), func() {
+		randomDuration(),
+		func() {
 			fmt.Println(time.Now().Sub(start))
 			t.Reset(randomDuration())
 		},

exercise6/problem7/problem7_test.go

@@ -6,12 +6,8 @@ import (
 
 func TestTask(t *testing.T) {
 	t.Run(
-		"init should run one only once", func(t *testing.T) {
+		"should avoid data race", func(t *testing.T) {
 			task()
-
-			if 0 != 1 {
-				t.Errorf("init function run times wrong")
-			}
 		},
 	)
 }