Enable clear/purge for failed digests

go/util/caching_test.go

 package util
 
 import (
         "testing"
 
         assert "github.com/stretchr/testify/require"
 )
 
 func TestJSONCodec(t *testing.T) {
-        type myTestType struct {
-                A int
-                B string
-        }
-
         itemCodec := JSONCodec(&myTestType{})
         testInstance := &myTestType{5, "hello"}
         jsonBytes, err := itemCodec.Encode(testInstance)
         assert.Nil(t, err)
 
         decodedInstance, err := itemCodec.Decode(jsonBytes)
         assert.Nil(t, err)
         assert.IsType(t, &myTestType{}, decodedInstance)
         assert.Equal(t, testInstance, decodedInstance)
 
         arrCodec := JSONCodec([]*myTestType{})
         testArr := []*myTestType{&myTestType{1, "1"}, &myTestType{2, "2"}}
         jsonBytes, err = arrCodec.Encode(testArr)
         assert.Nil(t, err)
 
         decodedArr, err := arrCodec.Decode(jsonBytes)
         assert.Nil(t, err)
         assert.IsType(t, []*myTestType{}, decodedArr)
         assert.Equal(t, testArr, decodedArr)
 }
+
+func TestMemLRUCache(t *testing.T) {
+        cache := NewMemLRUCache(0)
+        UnitTestLRUCache(t, cache)
+}