testcases := []struct {
		usages              []capi.KeyUsage
		expectedKeyUsage    x509.KeyUsage
		expectedExtKeyUsage []x509.ExtKeyUsage
		expectErr           bool
	}{
		{
			usages:              []capi.KeyUsage{"signing"},
			expectedKeyUsage:    x509.KeyUsageDigitalSignature,
			expectedExtKeyUsage: nil,
			expectErr:           false,
		},
		{
			usages:              []capi.KeyUsage{"client auth"},