add library until better solution

pkg/cache/cache_test.go

@@ -4,7 +4,10 @@ package cache
 
 import (
 	"errors"
+
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func Test_getDecisionLocalCache(t *testing.T) {
@@ -36,6 +39,8 @@ func Test_getDecisionLocalCache(t *testing.T) {
 			if got != tt.want {
 				t.Errorf("getDecisionLocalCache() = %v, want %v", got, tt.want)
 			}
+			// before removing find alternative
+			assert.Equal(t, err, tt.valueErr)
 		})
 	}
 }