use output test cases also for benchmarking

So far, the output tests were only used for correctness checking. But they
cover a variety of scenarios for which there were no benchmarks, therefore it
makes sense to also use them for that.

examples/output_test/output_test.go

@@ -34,12 +34,13 @@ import (
 	"k8s.io/klog/v2/textlogger"
 )
 
+func newLogger(out io.Writer, v int, vmodule string) logr.Logger {
+	return newZaprLogger(out, v)
+}
+
 // TestZaprOutput tests the zapr, directly and as backend.
 func TestZaprOutput(t *testing.T) {
 	test.InitKlog(t)
-	newLogger := func(out io.Writer, v int, vmodule string) logr.Logger {
-		return newZaprLogger(out, v)
-	}
 	t.Run("direct", func(t *testing.T) {
 		test.Output(t, test.OutputConfig{NewLogger: newLogger, ExpectedOutputMapping: test.ZaprOutputMappingDirect()})
 	})
@@ -48,6 +49,12 @@ func TestZaprOutput(t *testing.T) {
 	})
 }
 
+// Benchmark direct zapr output.
+func BenchmarkZaprOutput(b *testing.B) {
+	test.InitKlog(b)
+	test.Benchmark(b, test.OutputConfig{NewLogger: newLogger, ExpectedOutputMapping: test.ZaprOutputMappingDirect()})
+}
+
 // TestKlogrStackText tests klogr.klogr -> klog -> text logger.
 func TestKlogrStackText(t *testing.T) {
 	test.InitKlog(t)

output_test.go

@@ -26,18 +26,27 @@ import (
 	"k8s.io/klog/v2/test"
 )
 
-// TestKlogOutput tests klog output without a logger.
+// klogConfig tests klog output without a logger.
+var klogConfig = test.OutputConfig{}
+
 func TestKlogOutput(t *testing.T) {
 	test.InitKlog(t)
-	test.Output(t, test.OutputConfig{})
+	test.Output(t, klogConfig)
+}
+
+func BenchmarkKlogOutput(b *testing.B) {
+	test.InitKlog(b)
+	test.Benchmark(b, klogConfig)
+}
+
+// klogKlogrConfig tests klogr output via klog, using the klog/v2 klogr.
+var klogKLogrConfig = test.OutputConfig{
+	NewLogger: func(out io.Writer, v int, vmodule string) logr.Logger {
+		return klog.NewKlogr()
+	},
 }
 
-// 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()
-		},
-	})
+	test.Output(t, klogKLogrConfig)
 }