Fix flaky ProcessorRetry test

internal/asynqtest/asynqtest.go

@@ -7,6 +7,7 @@ package asynqtest
 
 import (
 	"encoding/json"
+	"math"
 	"sort"
 	"testing"
 
@@ -17,6 +18,14 @@ import (
 	"github.com/hibiken/asynq/internal/base"
 )
 
+// EquateInt64Approx returns a Comparer option that treats int64 values
+// to be equal if they are within the given margin.
+func EquateInt64Approx(margin int64) cmp.Option {
+	return cmp.Comparer(func(a, b int64) bool {
+		return math.Abs(float64(a-b)) < float64(margin)
+	})
+}
+
 // SortMsgOpt is a cmp.Option to sort base.TaskMessage for comparing slice of task messages.
 var SortMsgOpt = cmp.Transformer("SortTaskMessages", func(in []*base.TaskMessage) []*base.TaskMessage {
 	out := append([]*base.TaskMessage(nil), in...) // Copy input to avoid mutating it