diff --git a/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/mail/MailReaderTest.kt b/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/mail/MailReaderTest.kt
index 2e3a441..c4874dc 100644
--- a/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/mail/MailReaderTest.kt
+++ b/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/mail/MailReaderTest.kt
@@ -1,6 +1,7 @@
 package net.codinux.invoicing.mail
 
 import assertk.assertThat
+import assertk.assertions.isEmpty
 import assertk.assertions.isNotEmpty
 import org.junit.jupiter.api.Test
 import kotlin.test.Ignore