runtime: Optimize func noNeedForOutput and add test cases

Optimize func noNeedForOutput and add test cases for this func.

Fixes: #2747

Signed-off-by: bin <bin@hyper.sh>

src/runtime/pkg/containerd-shim-v2/utils.go

@@ -112,13 +112,5 @@ func getAddress(ctx context.Context, bundlePath, address, id string) (string, er
 }
 
 func noNeedForOutput(detach bool, tty bool) bool {
-	if !detach {
+	return detach && tty
-		return false
-	}
-
-	if !tty {
-		return false
-	}
-
-	return true
 }

src/runtime/pkg/containerd-shim-v2/utils_test.go

@@ -16,6 +16,9 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
 
 	"github.com/opencontainers/runtime-spec/specs-go"
 
@@ -326,3 +329,39 @@ func writeOCIConfigFile(spec specs.Spec, configPath string) error {
 
 	return ioutil.WriteFile(configPath, bytes, testFileMode)
 }
+
+func TestNoNeedForOutput(t *testing.T) {
+	assert := assert.New(t)
+
+	testCases := []struct {
+		detach bool
+		tty    bool
+		result bool
+	}{
+		{
+			detach: true,
+			tty:    true,
+			result: true,
+		},
+		{
+			detach: false,
+			tty:    true,
+			result: false,
+		},
+		{
+			detach: true,
+			tty:    false,
+			result: false,
+		},
+		{
+			detach: false,
+			tty:    false,
+			result: false,
+		},
+	}
+
+	for i := range testCases {
+		result := noNeedForOutput(testCases[i].detach, testCases[i].tty)
+		assert.Equal(testCases[i].result, result)
+	}
+}