Function TestDeepNestingBounded

internal/mailparse/parse_test.go:82–96

TestDeepNestingBounded pins the adversarial DoS fix: a deeply nested multipart message must parse quickly (depth-capped), not blow up O(depth²).

(t *testing.T)

// TestDeepNestingBounded pins the adversarial DoS fix: a deeply nested
// multipart message must parse quickly (depth-capped), not blow up O(depth²).
func TestDeepNestingBounded(t *testing.T) {
	var sb strings.Builder
	sb.WriteString("From: a@x.com\r\nContent-Type: multipart/mixed; boundary=b0\r\n\r\n")
	for i := 0; i < 5000; i++ {
		sb.WriteString("--b0\r\nContent-Type: multipart/mixed; boundary=b0\r\n\r\n")
	}
	sb.WriteString("--b0\r\nContent-Type: text/plain\r\n\r\ndeep\r\n")
	done := make(chan struct{})
	go func() { _, _ = ParsedBody([]byte(sb.String()), 0); close(done) }()
	select {
	case <-done:
	case <-time.After(3 * time.Second):
		t.Fatal("ParsedBody did not return within 3s on deeply nested multipart (DoS guard missing)")
	}
}

// TestNestedMultipartRecoversInnerText: mixed wrapping alternative → inner plain.
func TestNestedMultipartRecoversInnerText(t *testing.T) {