Add test to mention error with go templating

Signed-off-by: khanhtc1202 <[email protected]>

pkg/app/piped/sourceprocesser/sourceprocesser_test.go

@@ -0,0 +1,80 @@
+// Copyright 2024 The PipeCD Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sourceprocesser
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/pipe-cd/pipecd/pkg/config"
+)
+
+func TestSourceProcesser(t *testing.T) {
+	t.Parallel()
+
+	workspace, err := os.MkdirTemp("", "test-process-data")
+	require.NoError(t, err)
+	t.Cleanup(func() {
+		os.RemoveAll(workspace)
+	})
+	dcr := testSecretDecrypter{
+		prefix: "decrypted-",
+	}
+
+	fileData := map[string]string{
+		"config.yaml":   "config-data",
+		"resource.yaml": "echo {{ .attachment.config }} && echo {{ .encryptedSecrets.secret }}",
+	}
+	attachConfig := config.Attachment{
+		Sources: map[string]string{
+			"config": "config.yaml",
+		},
+		Targets: []string{
+			"resource.yaml",
+		},
+	}
+	secretConfig := config.SecretEncryption{
+		EncryptedSecrets: map[string]string{
+			"secret": "encrypted-secret",
+		},
+		DecryptionTargets: []string{
+			"resource.yaml",
+		},
+	}
+
+	appDir, err := os.MkdirTemp(workspace, "app-dir")
+	require.NoError(t, err)
+
+	for p, c := range fileData {
+		p = filepath.Join(appDir, p)
+		err = os.MkdirAll(filepath.Dir(p), 0700)
+		require.NoError(t, err)
+		err = os.WriteFile(p, []byte(c), 0600)
+		require.NoError(t, err)
+	}
+
+	err = DecryptSecrets(appDir, secretConfig, dcr)
+	require.NoError(t, err)
+	err = AttachData(appDir, attachConfig)
+	require.NoError(t, err)
+
+	data, err := os.ReadFile(filepath.Join(appDir, "resource.yaml"))
+	require.NoError(t, err)
+	assert.Equal(t, "echo config-data && echo decrypted-encrypted-secret", string(data))
+}