feat: add more tests to increase coverage

internal/cert/client_cert_test.go

@@ -1,18 +1,36 @@
 package cert
 
 import (
-	"crypto/x509"
 	"testing"
 
 	"github.com/stretchr/testify/require"
-	"gitlab.com/urkob/go-cert-gen/pkg/client"
 )
 
 func Test_newClientCert(t *testing.T) {
-	var config *client.ClientCertConfig
-	var rootCA *x509.Certificate
-	var rootKeyPEM []byte
-
-	_, _, err := newClientCert(config, rootCA, rootKeyPEM)
+	ca, err := NewRootCA(&rootTestConfig)
 	require.NoError(t, err)
+	require.NotNil(t, ca)
+
+	require.NotNil(t, ca.Key())
+	require.Greater(t, len(ca.Key()), 0)
+
+	require.NotNil(t, ca.PEM())
+	require.Greater(t, len(ca.PEM()), 0)
+
+	x509RootCA, err := parseCertificate(ca.PEM())
+	require.NoError(t, err)
+
+	pem, key, err := newClientCert(&clientTestConfig, x509RootCA, ca.Key())
+	require.NoError(t, err)
+
+	require.NotNil(t, pem)
+	require.Greater(t, len(pem), 0)
+
+	require.NotNil(t, key)
+	require.Greater(t, len(key), 0)
+}
+
+func Test_newClientCertErrr(t *testing.T) {
+	_, _, err := newClientCert(&clientTestConfig, nil, []byte{})
+	require.Error(t, err)
 }