ntfy-discord/internal/discord/fuzz_test.go

package discord

import (
	"encoding/json"
	"testing"

	"git.daviestechlabs.io/daviestechlabs/ntfy-discord/internal/ntfy"
)

// FuzzBuildEmbed tests that embed building doesn't panic on arbitrary input
func FuzzBuildEmbed(f *testing.F) {
	// Seed with normal inputs
	f.Add("Test Title", "Test message body", 3, "warning", "test-topic", "https://example.com")
	f.Add("", "", 0, "", "", "")
	f.Add("Alert!", "Critical issue detected", 5, "fire", "alerts", "")

	// Edge cases
	f.Add("x", "y", -1, "unknown", "t", "not-a-url")
	f.Add("x", "y", 100, "", "", "")
	f.Add("🔥 Fire Alert", "💀 Something broke", 5, "skull", "test", "")

	// Long strings
	longStr := ""
	for i := 0; i < 10000; i++ {
		longStr += "x"
	}
	f.Add(longStr, longStr, 3, "tag", "topic", "https://example.com")

	// Special characters
	f.Add("Title\x00with\x00nulls", "Message\nwith\nnewlines", 3, "tag", "topic", "")
	f.Add("<script>alert('xss')</script>", "```code```", 3, "", "", "")
	f.Add("Title\t\r\n", "Body\t\r\n", 3, "", "", "")

	f.Fuzz(func(t *testing.T, title, message string, priority int, tag, topic, click string) {
		msg := ntfy.Message{
			Title:    title,
			Message:  message,
			Priority: priority,
			Tags:     []string{tag},
			Topic:    topic,
			Click:    click,
			Time:     1706803200,
		}

		client := NewClient()

		// Should never panic
		embed := client.buildEmbed(msg)

		// Resulting embed should be valid
		if embed.Footer == nil {
			t.Error("Footer should never be nil")
		}

		// Color should always be set to a valid value
		if embed.Color == 0 {
			t.Error("Color should never be 0")
		}
	})
}

// FuzzExtractEmoji tests emoji extraction doesn't panic
func FuzzExtractEmoji(f *testing.F) {
	// Valid tags
	f.Add("warning")
	f.Add("fire")
	f.Add("check")
	f.Add("rocket")

	// Edge cases
	f.Add("")
	f.Add("unknown_tag")
	f.Add("WARNING") // uppercase
	f.Add("WaRnInG") // mixed case
	f.Add("\x00")
	f.Add("tag with spaces")
	f.Add("émoji")
	f.Add("🔥")        // emoji as tag
	f.Add("a]b[c{d}") // special chars

	f.Fuzz(func(t *testing.T, tag string) {
		client := NewClient()

		// Should never panic
		tags := []string{tag}
		_ = client.extractEmoji(tags)

		// Multiple tags
		_ = client.extractEmoji([]string{tag, tag, tag})

		// Empty slice
		_ = client.extractEmoji([]string{})

		// Nil slice
		_ = client.extractEmoji(nil)
	})
}

// FuzzWebhookPayloadJSON tests JSON marshaling of payloads
func FuzzWebhookPayloadJSON(f *testing.F) {
	f.Add("Title", "Description", 3066993, "Topic", "value", "footer")

	f.Fuzz(func(t *testing.T, title, desc string, color int, fieldName, fieldValue, footer string) {
		payload := WebhookPayload{
			Embeds: []Embed{
				{
					Title:       title,
					Description: desc,
					Color:       color,
					Fields: []Field{
						{Name: fieldName, Value: fieldValue, Inline: true},
					},
					Footer: &Footer{Text: footer},
				},
			},
		}

		// Marshaling should not panic
		_, err := json.Marshal(payload)
		if err != nil {
			// JSON encoding errors are acceptable for invalid UTF-8
			// but should not panic
		}
	})
}