fixup! add new cache.Options field to customize transform

attempt to fix race introduced in test by not referring to modified variable within callback

pkg/cache/cache_test.go

@@ -167,13 +167,19 @@ var _ = Describe("Cache with transformers", func() {
 	})
 
 	BeforeEach(func() {
-		transformerHits = make(chan struct{}, 10)
+		hitsChan := make(chan struct{}, 10)
 
 		var err error
 		var transform = func(i interface{}) (interface{}, error) {
-			transformerHits <- struct{}{}
+			select {
+			case hitsChan <- struct{}{}:
+				// Notified the hit
+			default:
+				// don't block on sending
+			}
 			return i, nil
 		}
+		transformerHits = hitsChan
 
 		clien, err = client.New(cfg, client.Options{})
 		Expect(err).NotTo(HaveOccurred())
@@ -218,7 +224,6 @@ var _ = Describe("Cache with transformers", func() {
 		informerCacheCancel()
 
 		// Reset channel for future tests
-		close(transformerHits)
 		transformerHits = nil
 	})