tests: Replace struct with closure

logs/pod_watcher_test.go

@@ -90,25 +90,22 @@ func TestPodWatcherClose(t *testing.T) {
 	assert.Equal(t, "[foo] it worked\n", buf.String())
 }
 
-type logReaderIterator struct {
-	rcs []io.ReadCloser
+// makeReadCloserIterator returns a function which returns a function which
+// iterates through each provided ReadCloser.
+func makeReadCloserIterator(rcs ...io.ReadCloser) func() io.ReadCloser {
+	return func() (rc io.ReadCloser) {
+		rc, rcs = rcs[0], rcs[1:]
+		return
 	}
-
-func (f *logReaderIterator) next() io.ReadCloser {
-	var rc io.ReadCloser
-	rc, f.rcs = f.rcs[0], f.rcs[1:]
-	return rc
 }
 
 func TestPodWatcherRemovedPod(t *testing.T) {
 	podsWatcher := watch.NewFake()
-
 	r1, w1 := io.Pipe()
 	r2, w2 := io.Pipe()
-	it := logReaderIterator{[]io.ReadCloser{r1, r2}}
 
 	clientset := mockClientset{
-		getLogsReaderFunc: it.next,
+		getLogsReaderFunc: makeReadCloserIterator(r1, r2),
 		getLogsStatusCode: http.StatusOK,
 		podsWatcher:       podsWatcher,
 	}