Add NewMust

cache.go

@@ -9,6 +9,15 @@ import (
 
 type replaceFunc[K comparable, V any] func(ctx context.Context, key K) (V, error)
 
+// NewMust is similar to New, but panics on error.
+func NewMust[K comparable, V any](replaceFn replaceFunc[K, V], freshFor, ttl time.Duration, options ...CacheOption) *Cache[K, V] {
+	c, err := New(replaceFn, freshFor, ttl, options...)
+	if err != nil {
+		panic(err)
+	}
+	return c
+}
+
 // New creates a new cache instance.
 // You can specify ttl longer than freshFor to achieve 'graceful cache replacement', where stale item is served via Get
 // while a single goroutine is launched in the background to retrieve a fresh item.

cache_test.go

@@ -12,7 +12,30 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-// TestNew tests the behavior of New.
+func TestNewMust(t *testing.T) {
+	t.Parallel()
+
+	fn := func(ctx context.Context, s string) (string, error) { return "", nil }
+
+	t.Run("success", func(t *testing.T) {
+		t.Parallel()
+
+		_ = NewMust(fn, 0, 0)
+	})
+	t.Run("fail", func(t *testing.T) {
+		t.Parallel()
+
+		func() {
+			defer func() {
+				err := recover()
+				assert.NotNil(t, err)
+			}()
+
+			_ = NewMust(fn, -1, -1)
+		}()
+	})
+}
+
 func TestNew(t *testing.T) {
 	t.Parallel()