Test [Exporter] JSON Exporter (#10)

- [+] feat(export): add unit test for JSONExporter functionality in expoter_test.go

Reviewed-on: #10
Co-authored-by: H0llyW00dzZ <h0llyw00dzz@pm.me>
Co-committed-by: H0llyW00dzZ <h0llyw00dzz@pm.me>

export/expoter_test.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2025 H0llyW00dzZ All rights reserved.
+//
+// By accessing or using this software, you agree to be bound by the terms
+// of the License Agreement, which you can find at LICENSE files.
+
+package export_test
+
+import (
+	"testing"
+
+	"git.b0zal.io/H0llyW00dzZ/imap/export"
+	"github.com/stretchr/testify/assert"
+	"github.com/valyala/bytebufferpool"
+)
+
+func TestJSONExporter(t *testing.T) {
+	// Create a sample message
+	messages := []map[string]interface{}{
+		{
+			"id":      "1",
+			"from":    []string{"contact@example.org"},
+			"subject": "A little message, just for you",
+			"body":    "Hi there :)",
+		},
+	}
+
+	// Get a buffer from the pool
+	buffer := bytebufferpool.Get()
+	defer func() {
+		buffer.Reset()             // Reset the buffer to prevent data leaks
+		bytebufferpool.Put(buffer) // Return the buffer to the pool
+	}()
+
+	// Create a JSONExporter with the default encoder
+	exporter := &export.JSONExporter{
+		Encoder: export.DefaultJSONEncoder,
+	}
+
+	// Export the messages to the buffer
+	err := exporter.Export(messages, buffer)
+	assert.NoError(t, err, "Failed to export messages")
+
+	// Define the expected JSON output
+	expectedJSON := `[{"body":"Hi there :)","from":["contact@example.org"],"id":"1","subject":"A little message, just for you"}]
+`
+
+	// Assert that the buffer content matches the expected JSON
+	assert.Equal(t, expectedJSON, buffer.String(), "Unexpected JSON output")
+}