Adds a fake Secrets client

A simpler implementation than https://github.com/kubernetes/client-go/blob/master/kubernetes/typed/core/v1/fake/fake_secret.go and more suited for unit tests that don't spin up a controller

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

BUILD.bazel

@@ -90,6 +90,7 @@ filegroup(
         "//test/acme/dns:all-srcs",
         "//test/e2e:all-srcs",
         "//test/integration:all-srcs",
+        "//test/unit/coreclients:all-srcs",
         "//test/unit/gen:all-srcs",
         "//test/unit/listers:all-srcs",
         "//tools/cobra:all-srcs",

test/unit/coreclients/BUILD.bazel

@@ -0,0 +1,29 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["secrets.go"],
+    importpath = "github.com/jetstack/cert-manager/test/unit/coreclients",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@io_k8s_api//core/v1:go_default_library",
+        "@io_k8s_apimachinery//pkg/apis/meta/v1:go_default_library",
+        "@io_k8s_apimachinery//pkg/types:go_default_library",
+        "@io_k8s_apimachinery//pkg/watch:go_default_library",
+        "@io_k8s_client_go//kubernetes/typed/core/v1: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"],
+)

test/unit/coreclients/secrets.go

@@ -0,0 +1,124 @@
+/*
+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.
+*/
+
+// coreclients contains fakes for some of the types from
+// k8s.io/client-go/kubernetes/typed/core/v1
+package coreclients
+
+import (
+	"context"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/watch"
+	typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
+)
+
+var _ typedcorev1.SecretsGetter = &FakeSecretsGetter{}
+
+// FakeSecretsGetter can be used to mock typedcorev1.SecretsGetter in tests.
+type FakeSecretsGetter struct {
+	c *fakeSecretClient
+}
+
+type FakeSecretsGetterModifier func(*FakeSecretsGetter)
+
+// NewFakeSecretsGetterFrom can be used to create a mock typedcorev1.SecretsGetter for tests.
+// Example: NewFakeSecretsGetterFrom(NewFakeSecretsGetter(), SetFakeSecretsGetterCreate(<secret>, <error>)).
+func NewFakeSecretsGetterFrom(f *FakeSecretsGetter, mods ...FakeSecretsGetterModifier) *FakeSecretsGetter {
+	for _, mod := range mods {
+		mod(f)
+	}
+	return f
+}
+
+func NewFakeSecretsGetter() *FakeSecretsGetter {
+	return &FakeSecretsGetter{
+		c: &fakeSecretClient{},
+	}
+}
+
+// SetFakeSecretsGetterCreate is a modifier that can be used to set secret and
+// error that will be returned when
+// FakeSecretsGetter(<namespace>).Create(<secret>, <opts>) is called.
+func SetFakeSecretsGetterCreate(s *corev1.Secret, err error) FakeSecretsGetterModifier {
+	return func(f *FakeSecretsGetter) {
+		f.c.CreateFn = func() (*corev1.Secret, error) {
+			return s, err
+		}
+	}
+}
+
+// SetFakeSecretsGetterGet is a modifier that can be used to set secret and
+// error that will be returned when
+// FakeSecretsGetter(<namespace>).Get(<context>,<uid>,<opts>) is called.
+func SetFakeSecretsGetterGet(s *corev1.Secret, err error) FakeSecretsGetterModifier {
+	return func(f *FakeSecretsGetter) {
+		f.c.GetFn = func() (*corev1.Secret, error) {
+			return s, err
+		}
+	}
+}
+
+func (f *FakeSecretsGetter) Secrets(string) typedcorev1.SecretInterface {
+	return f.c
+}
+
+type fakeSecretClient struct {
+	CreateFn           func() (*corev1.Secret, error)
+	UpdateFn           func() (*corev1.Secret, error)
+	DeleteFn           func() error
+	DeleteCollectionFn func() error
+	GetFn              func() (*corev1.Secret, error)
+	ListFn             func() (*corev1.SecretList, error)
+	WatchFn            func() (watch.Interface, error)
+	PatchFn            func() (*corev1.Secret, error)
+	// Currently there is no need to mock this interface
+	typedcorev1.SecretExpansion
+}
+
+func (f *fakeSecretClient) Create(context.Context, *corev1.Secret, metav1.CreateOptions) (*corev1.Secret, error) {
+	return f.CreateFn()
+}
+
+func (f *fakeSecretClient) Update(context.Context, *corev1.Secret, metav1.UpdateOptions) (*corev1.Secret, error) {
+	return f.UpdateFn()
+}
+
+func (f *fakeSecretClient) Delete(context.Context, string, metav1.DeleteOptions) error {
+	return f.DeleteFn()
+}
+
+func (f *fakeSecretClient) DeleteCollection(context.Context, metav1.DeleteOptions, metav1.ListOptions) error {
+	return f.DeleteCollectionFn()
+}
+
+func (f *fakeSecretClient) Get(context.Context, string, metav1.GetOptions) (*corev1.Secret, error) {
+	return f.GetFn()
+}
+
+func (f *fakeSecretClient) List(context.Context, metav1.ListOptions) (*corev1.SecretList, error) {
+	return f.ListFn()
+}
+
+func (f *fakeSecretClient) Watch(context.Context, metav1.ListOptions) (watch.Interface, error) {
+	return f.WatchFn()
+}
+
+func (f *fakeSecretClient) Patch(context.Context, string, types.PatchType, []byte, metav1.PatchOptions, ...string) (*corev1.Secret, error) {
+	return f.PatchFn()
+}