Add testing for lru cache

server/cache_test.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"testing"
 	"time"
+
+	lru "github.com/hashicorp/golang-lru/v2"
 )
 
 func getCacheSize() int {
@@ -42,3 +44,22 @@ func TestCache(t *testing.T) {
 		t.Fatalf("expected 0 items in cache, got %d", size)
 	}
 }
+
+func TestLRUCache(t *testing.T) {
+	cacheLRU, _ = lru.New[string, any](1000)
+
+	for i := 0; i < 2000; i++ {
+		withLRUCache(fmt.Sprintf("item-%d", i), func() ([]byte, error) {
+			return []byte{byte(i % 256)}, nil
+		})
+	}
+	if l := cacheLRU.Len(); l != 1000 {
+		t.Fatalf("expected 1000 items in cache, got %d", l)
+	}
+
+	// the `gc` function does not remove items from the LRU cache
+	gc(time.Now())
+	if l := cacheLRU.Len(); l != 1000 {
+		t.Fatalf("expected 1000 items in cache, got %d", l)
+	}
+}