Pull controller-go back into this repository as internal/controllerlib.

Signed-off-by: Matt Moyer <moyerm@vmware.com>

internal/controllerlib/testing.go

@@ -0,0 +1,29 @@
+/*
+Copyright 2020 VMware, Inc.
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package controllerlib
+
+import (
+	"testing"
+)
+
+func TestSync(t *testing.T, controller Controller, ctx Context) error {
+	t.Helper() // force testing import to discourage external use
+	return controller.sync(ctx)
+}
+
+func TestWrap(t *testing.T, controller Controller, wrapper SyncWrapperFunc) {
+	t.Helper() // force testing import to discourage external use
+	controller.wrap(wrapper)
+}
+
+// Just enough of the internal implementation of controller.Run() to allow
+// "running" the controller without any goroutines being involved. For use
+// in synchronous unit tests that wish to invoke TestSync() directly.
+func TestRunSynchronously(t *testing.T, controller Controller) {
+	t.Helper() // force testing import to discourage external use
+	controller.invokeAllRunOpts()
+	controller.waitForCacheSyncWithTimeout()
+}