From 01c58a1cf43635cd6b5be05ebe78b287da88f138 Mon Sep 17 00:00:00 2001
From: Richard Russon <rich@flatcap.org>
Date: Sat, 27 Apr 2019 22:26:07 +0100
Subject: [PATCH] test: add idna tests for degenerate cases

---
 test/idna/mutt_idna_intl_to_local.c | 8 ++++++++
 test/idna/mutt_idna_local_to_intl.c | 8 ++++++++
 test/idna/mutt_idna_to_ascii_lz.c   | 9 +++++++++
 3 files changed, 25 insertions(+)

diff --git a/test/idna/mutt_idna_intl_to_local.c b/test/idna/mutt_idna_intl_to_local.c
index e076b6928..a6e0e6d0e 100644
--- a/test/idna/mutt_idna_intl_to_local.c
+++ b/test/idna/mutt_idna_intl_to_local.c
@@ -29,4 +29,12 @@
 void test_mutt_idna_intl_to_local(void)
 {
   // char * mutt_idna_intl_to_local(const char *user, const char *domain, int flags);
+
+  {
+    TEST_CHECK(!mutt_idna_intl_to_local(NULL, "banana", 0));
+  }
+
+  {
+    TEST_CHECK(!mutt_idna_intl_to_local("apple", NULL, 0));
+  }
 }
diff --git a/test/idna/mutt_idna_local_to_intl.c b/test/idna/mutt_idna_local_to_intl.c
index 11c905855..63657cd7a 100644
--- a/test/idna/mutt_idna_local_to_intl.c
+++ b/test/idna/mutt_idna_local_to_intl.c
@@ -29,4 +29,12 @@
 void test_mutt_idna_local_to_intl(void)
 {
   // char * mutt_idna_local_to_intl(const char *user, const char *domain);
+
+  {
+    TEST_CHECK(!mutt_idna_local_to_intl(NULL, "banana"));
+  }
+
+  {
+    TEST_CHECK(!mutt_idna_local_to_intl("apple", NULL));
+  }
 }
diff --git a/test/idna/mutt_idna_to_ascii_lz.c b/test/idna/mutt_idna_to_ascii_lz.c
index 68826c1e4..bf45b32d8 100644
--- a/test/idna/mutt_idna_to_ascii_lz.c
+++ b/test/idna/mutt_idna_to_ascii_lz.c
@@ -29,4 +29,13 @@
 void test_mutt_idna_to_ascii_lz(void)
 {
   // int mutt_idna_to_ascii_lz(const char *input, char **output, int flags);
+
+  {
+    char *out = NULL;
+    TEST_CHECK(mutt_idna_to_ascii_lz(NULL, &out, 0) == -1);
+  }
+
+  {
+    TEST_CHECK(mutt_idna_to_ascii_lz("apple", NULL, 0) == -1);
+  }
 }
-- 
2.40.0