Fixes #21. Callong OnDelete during gc()

cache.go

@@ -223,6 +223,9 @@ func (c *Cache) gc() {
 			c.bucket(item.key).delete(item.key)
 			c.size -= item.size
 			c.list.Remove(element)
+			if c.onDelete != nil {
+				c.onDelete(item)
+			}
 			item.promotions = -2
 		}
 		element = prev

cache_test.go

@@ -98,7 +98,14 @@ func (_ CacheTests) TrackerDoesNotCleanupHeldInstance() {
 }
 
 func (_ CacheTests) RemovesOldestItemWhenFull() {
-	cache := New(Configure().MaxSize(5).ItemsToPrune(1))
+	onDeleteFnCalled := false
+	onDeleteFn := func(item *Item) {
+		if item.key == "0" {
+			onDeleteFnCalled = true
+		}
+	}
+
+	cache := New(Configure().MaxSize(5).ItemsToPrune(1).OnDelete(onDeleteFn))
 	for i := 0; i < 7; i++ {
 		cache.Set(strconv.Itoa(i), i, time.Minute)
 	}
@@ -106,6 +113,7 @@ func (_ CacheTests) RemovesOldestItemWhenFull() {
 	Expect(cache.Get("0")).To.Equal(nil)
 	Expect(cache.Get("1")).To.Equal(nil)
 	Expect(cache.Get("2").Value()).To.Equal(2)
+	Expect(onDeleteFnCalled).To.Equal(true)
 }
 
 func (_ CacheTests) RemovesOldestItemWhenFullBySizer() {

secondarycache_test.go

@@ -2,9 +2,9 @@ package ccache
 
 import (
 	. "github.com/karlseguin/expect"
+	"strconv"
 	"testing"
 	"time"
-	"strconv"
 )
 
 type SecondaryCacheTests struct{}