Add a fake scheduler

To allow for testing whether an item gets re-queued in unit tests

Signed-off-by: irbekrm <irbekrm@gmail.com>

pkg/scheduler/BUILD.bazel

@@ -24,7 +24,10 @@ filegroup(
 
 filegroup(
     name = "all-srcs",
-    srcs = [":package-srcs"],
+    srcs = [
+        ":package-srcs",
+        "//pkg/scheduler/test:all-srcs",
+    ],
     tags = ["automanaged"],
     visibility = ["//visibility:public"],
 )

pkg/scheduler/test/BUILD.bazel

@@ -0,0 +1,23 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["fake.go"],
+    importpath = "github.com/jetstack/cert-manager/pkg/scheduler/test",
+    visibility = ["//visibility:public"],
+    deps = ["//pkg/scheduler:go_default_library"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

pkg/scheduler/test/fake.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2020 The cert-manager Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package test
+
+import (
+	"time"
+
+	"github.com/jetstack/cert-manager/pkg/scheduler"
+)
+
+var _ scheduler.ScheduledWorkQueue = &FakeScheduler{}
+
+// FakeScheduler allows stubbing the methods of scheduler.ScheduledWorkQueue in tests.
+type FakeScheduler struct {
+	AddFunc    func(interface{}, time.Duration)
+	ForgetFunc func(interface{})
+}
+
+func (f *FakeScheduler) Add(obj interface{}, duration time.Duration) {
+	f.AddFunc(obj, duration)
+}
+
+func (f *FakeScheduler) Forget(obj interface{}) {
+	f.ForgetFunc(obj)
+}