feat: cmd add some tests

cmd/main.go

@@ -87,28 +87,50 @@ var rootCmd = &cobra.Command{
 			log.Fatalf("rootCA.WithClientCert: %s", err)
 		}
 
-		exportPem("root-ca.pem", rootCA.PEM())
-		exportPem("root-key.pem", rootCA.Key())
+		outputPath, err := exportPem("root-ca.pem", rootCA.PEM())
+		if err != nil {
+			log.Fatalf("exportPem: %s\n", err)
+		}
+		log.Printf("file created successfully: %s\n", outputPath)
 
-		exportPem("client-cert.pem", clientCert.PEM())
-		exportPem("client-key.pem", clientCert.Key())
+		outputPath, err = exportPem("root-key.pem", rootCA.Key())
+		if err != nil {
+			log.Fatalf("exportPem: %s\n", err)
+		}
+		log.Printf("file created successfully: %s\n", outputPath)
+
+		outputPath, err = exportPem("client-cert.pem", clientCert.PEM())
+		if err != nil {
+			log.Fatalf("exportPem: %s\n", err)
+		}
+		log.Printf("file created successfully: %s\n", outputPath)
+
+		outputPath, err = exportPem("client-key.pem", clientCert.Key())
+		if err != nil {
+			log.Fatalf("exportPem: %s\n", err)
+		}
+		log.Printf("file created successfully: %s\n", outputPath)
 	},
 }
 
 func getExtKeyUsage(intKeyUsageSlice []int) []x509.ExtKeyUsage {
-	extKeyUsage := make([]x509.ExtKeyUsage, len(intKeyUsageSlice))
+	if intKeyUsageSlice == nil || len(intKeyUsageSlice) <= 0 {
+		return []x509.ExtKeyUsage{}
+	}
+
+	extKeyUsage := make([]x509.ExtKeyUsage, 0, len(intKeyUsageSlice))
 	for _, v := range intKeyUsageSlice {
 		extKeyUsage = append(extKeyUsage, x509.ExtKeyUsage(v))
 	}
 	return extKeyUsage
 }
 
-func exportPem(filename string, data []byte) {
+func exportPem(filename string, data []byte) (string, error) {
 	outputPath, err := writer.WriteFile(filename, data)
 	if err != nil {
-		log.Fatalf("rootCA.WithClientCert: %s", err)
+		return "", fmt.Errorf("rootCA.WithClientCert: %s", err)
 	}
-	log.Printf("file created successfully: %s\n", outputPath)
+	return outputPath, nil
 }
 
 func init() {

cmd/main_test.go

@@ -1,7 +1,62 @@
 package cmd
 
-import "testing"
+import (
+	"crypto/x509"
+	"log"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gitlab.com/urkob/go-cert-gen/internal/io"
+)
 
 func TestExecute(t *testing.T) {
 	Execute()
 }
+
+func Test_getExtKeyUsage(t *testing.T) {
+	intKeyUsageSlice := make([]int, 0, 1)
+	intKeyUsageSlice = append(intKeyUsageSlice, int(x509.ExtKeyUsageClientAuth))
+
+	keyUsage := getExtKeyUsage(intKeyUsageSlice)
+	assert.Len(t, keyUsage, len(intKeyUsageSlice))
+	assert.Equal(t, keyUsage[0], x509.ExtKeyUsageClientAuth)
+
+	intKeyUsageSlice = make([]int, 0)
+	keyUsage = getExtKeyUsage(intKeyUsageSlice)
+	assert.Len(t, keyUsage, 0)
+
+	keyUsage = getExtKeyUsage(nil)
+	assert.Len(t, keyUsage, 0)
+}
+
+var testFile = "test-file.txt"
+
+func init() {
+	wd, err := os.Getwd()
+	if err != nil {
+		log.Fatalf("os.Getwd: %s\n", err)
+	}
+	writer = io.NewWriter(wd)
+}
+
+func Test_exportPem(t *testing.T) {
+	defer func() {
+		os.Remove(testFile)
+		// err := os.Remove(testFile)
+		// require.NoError(t, err)
+	}()
+
+	data := []byte("test data")
+	outputPath, err := exportPem(testFile, data)
+	require.NoError(t, err)
+	require.NotEmpty(t, outputPath)
+}
+
+func Test_exportPemError(t *testing.T) {
+	data := []byte("test data")
+	outputPath, err := exportPem("", data)
+	require.Error(t, err)
+	require.Empty(t, outputPath)
+}