Add a noop cache

Author: emad-elsaid

cache/noop.go

@@ -0,0 +1,7 @@
+package cache
+
+// Noop discards all writes and load always fails. useful for tests for example.
+type Noop[K, V any] struct{}
+
+func (_ Noop[K, V]) Load(_ K) (value V, loaded bool) { return }
+func (_ Noop[K, V]) Store(_ K, _ V)                  {}

cache/noop_test.go

@@ -0,0 +1,17 @@
+package cache
+
+import "testing"
+
+func TestNoop(t *testing.T) {
+	t.Run("Implements Cacher", func(t *testing.T) {
+		var _ Cacher[any, any] = Noop[any, any]{}
+	})
+
+	t.Run("Discards writes", func(t *testing.T) {
+		c := Noop[string, int]{}
+		c.Store("k1", 1)
+		v, loaded := c.Load("k1")
+		assertEqual(t, 0, v)
+		assertEqual(t, false, loaded)
+	})
+}