move output tests into packages

Previously it was necessary to enter the "examples" module to run output tests
for code in the main module. Now "go test ./..." at the root or in individual
directories also runs these tests.

examples/output_test/output_test.go

@@ -34,33 +34,6 @@ import (
 	"k8s.io/klog/v2/textlogger"
 )
 
-// TestKlogOutput tests klog output without a logger.
-func TestKlogOutput(t *testing.T) {
-	test.InitKlog(t)
-	test.Output(t, test.OutputConfig{})
-}
-
-// TestTextloggerOutput tests the textlogger, directly and as backend.
-func TestTextloggerOutput(t *testing.T) {
-	test.InitKlog(t)
-	newLogger := func(out io.Writer, v int, vmodule string) logr.Logger {
-		config := textlogger.NewConfig(
-			textlogger.Verbosity(v),
-			textlogger.Output(out),
-		)
-		if err := config.VModule().Set(vmodule); err != nil {
-			panic(err)
-		}
-		return textlogger.NewLogger(config)
-	}
-	t.Run("direct", func(t *testing.T) {
-		test.Output(t, test.OutputConfig{NewLogger: newLogger, SupportsVModule: true})
-	})
-	t.Run("klog-backend", func(t *testing.T) {
-		test.Output(t, test.OutputConfig{NewLogger: newLogger, AsBackend: true})
-	})
-}
-
 // TestZaprOutput tests the zapr, directly and as backend.
 func TestZaprOutput(t *testing.T) {
 	test.InitKlog(t)
@@ -75,16 +48,6 @@ func TestZaprOutput(t *testing.T) {
 	})
 }
 
-// TestKlogrOutput tests klogr output via klog.
-func TestKlogrOutput(t *testing.T) {
-	test.InitKlog(t)
-	test.Output(t, test.OutputConfig{
-		NewLogger: func(out io.Writer, v int, vmodule string) logr.Logger {
-			return klogr.NewWithOptions(klogr.WithFormat(klogr.FormatKlog))
-		},
-	})
-}
-
 // TestKlogrStackText tests klogr.klogr -> klog -> text logger.
 func TestKlogrStackText(t *testing.T) {
 	test.InitKlog(t)

klogr/output_test.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2022 The Kubernetes 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 klogr_test
+
+import (
+	"io"
+	"testing"
+
+	"github.com/go-logr/logr"
+
+	"k8s.io/klog/v2/klogr"
+	"k8s.io/klog/v2/test"
+)
+
+// TestKlogrOutput tests klogr output via klog.
+func TestKlogrOutput(t *testing.T) {
+	test.InitKlog(t)
+	test.Output(t, test.OutputConfig{
+		NewLogger: func(out io.Writer, v int, vmodule string) logr.Logger {
+			return klogr.NewWithOptions(klogr.WithFormat(klogr.FormatKlog))
+		},
+	})
+}

output_test.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2022 The Kubernetes 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 klog_test
+
+import (
+	"io"
+	"testing"
+
+	"github.com/go-logr/logr"
+
+	"k8s.io/klog/v2"
+	"k8s.io/klog/v2/test"
+)
+
+// TestKlogOutput tests klog output without a logger.
+func TestKlogOutput(t *testing.T) {
+	test.InitKlog(t)
+	test.Output(t, test.OutputConfig{})
+}
+
+// TestKlogKlogrOutput tests klogr output via klog, using the klog/v2 klogr.
+func TestKlogrOutput(t *testing.T) {
+	test.InitKlog(t)
+	test.Output(t, test.OutputConfig{
+		NewLogger: func(out io.Writer, v int, vmodule string) logr.Logger {
+			return klog.NewKlogr()
+		},
+	})
+}

textlogger/output_test.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2022 The Kubernetes 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 textlogger_test
+
+import (
+	"io"
+	"testing"
+
+	"github.com/go-logr/logr"
+
+	"k8s.io/klog/v2/test"
+	"k8s.io/klog/v2/textlogger"
+)
+
+// TestTextloggerOutput tests the textlogger, directly and as backend.
+func TestTextloggerOutput(t *testing.T) {
+	test.InitKlog(t)
+	newLogger := func(out io.Writer, v int, vmodule string) logr.Logger {
+		config := textlogger.NewConfig(
+			textlogger.Verbosity(v),
+			textlogger.Output(out),
+		)
+		if err := config.VModule().Set(vmodule); err != nil {
+			panic(err)
+		}
+		return textlogger.NewLogger(config)
+	}
+	t.Run("direct", func(t *testing.T) {
+		test.Output(t, test.OutputConfig{NewLogger: newLogger, SupportsVModule: true})
+	})
+	t.Run("klog-backend", func(t *testing.T) {
+		test.Output(t, test.OutputConfig{NewLogger: newLogger, AsBackend: true})
+	})
+}