Add pkg/logs/testing package

Signed-off-by: James Munnelly <james@munnelly.eu>

pkg/logs/BUILD.bazel

@@ -26,7 +26,10 @@ filegroup(
 
 filegroup(
     name = "all-srcs",
-    srcs = [":package-srcs"],
+    srcs = [
+        ":package-srcs",
+        "//pkg/logs/testing:all-srcs",
+    ],
     tags = ["automanaged"],
     visibility = ["//visibility:public"],
 )

pkg/logs/testing/BUILD.bazel

@@ -0,0 +1,23 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["log_testing.go"],
+    importpath = "github.com/jetstack/cert-manager/pkg/logs/testing",
+    visibility = ["//visibility:public"],
+    deps = ["@com_github_go_logr_logr//: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/logs/testing/log_testing.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2020 The Jetstack cert-manager contributors.
+
+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 testing
+
+import (
+	"testing"
+
+	"github.com/go-logr/logr"
+)
+
+// TestLogger is a logr.Logger that prints through a testing.T object.
+type TestLogger struct {
+	T *testing.T
+}
+
+var _ logr.Logger = TestLogger{}
+
+func (_ TestLogger) Enabled() bool {
+	return true
+}
+
+func (log TestLogger) Info(msg string, args ...interface{}) {
+	log.T.Logf("%s: %v", msg, args)
+}
+
+func (log TestLogger) Error(err error, msg string, args ...interface{}) {
+	log.T.Logf("%s: %v -- %v", msg, err, args)
+}
+
+func (log TestLogger) V(v int) logr.InfoLogger {
+	return log
+}
+
+func (log TestLogger) WithName(_ string) logr.Logger {
+	return log
+}
+
+func (log TestLogger) WithValues(_ ...interface{}) logr.Logger {
+	return log
+}