diff --git a/tests/suites/test_suite_cipher.chachapoly.data b/tests/suites/test_suite_cipher.chachapoly.data
index 8c246ad..908951a 100644
--- a/tests/suites/test_suite_cipher.chachapoly.data
+++ b/tests/suites/test_suite_cipher.chachapoly.data
@@ -121,3 +121,23 @@
 Chacha20+Poly1305 RFC 7539 Test Vector #1 (streaming)
 depends_on:MBEDTLS_CHACHAPOLY_C
 decrypt_test_vec:MBEDTLS_CIPHER_CHACHA20_POLY1305:-1:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"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":"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":"f33388860000000000004e91":"eead9d67890cbb22392336fea1851f38":0:0
+
+ChaCha20+Poly1305 IV Length 0
+depends_on:MBEDTLS_CHACHAPOLY_C
+check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":0:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
+
+ChaCha20+Poly1305 IV Length 11
+depends_on:MBEDTLS_CHACHAPOLY_C
+check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":11:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
+
+ChaCha20+Poly1305 IV Length 12
+depends_on:MBEDTLS_CHACHAPOLY_C
+check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":12:0
+
+ChaCha20+Poly1305 IV Length 13
+depends_on:MBEDTLS_CHACHAPOLY_C
+check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":13:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
+
+ChaCha20+Poly1305 IV Length 16
+depends_on:MBEDTLS_CHACHAPOLY_C
+check_iv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":16:MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index 73e548d..7d64fa7 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -758,7 +758,8 @@
     memset( decbuf, 0, sizeof( decbuf ) );
     memset( tag, 0, sizeof( tag ) );
 
-    if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
+    if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 ||
+        cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
         iv_len = 12;
     else
         iv_len = sizeof(iv);
@@ -887,6 +888,7 @@
 {
     unsigned char key[32];
     unsigned char iv[16];
+    size_t iv_len = sizeof(iv);
 
     mbedtls_cipher_context_t ctx_dec;
     const mbedtls_cipher_info_t *cipher_info;
@@ -907,6 +909,11 @@
     /* Initialise context */
     cipher_info = mbedtls_cipher_info_from_type( cipher );
     TEST_ASSERT( NULL != cipher_info);
+
+    if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 ||
+        cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
+        iv_len = 12;
+
     TEST_ASSERT( sizeof(key) * 8 >= cipher_info->key_bitlen );
 
     TEST_ASSERT( 0 == mbedtls_cipher_setup( &ctx_dec, cipher_info ) );
@@ -915,7 +922,7 @@
                                              key, cipher_info->key_bitlen,
                                              MBEDTLS_DECRYPT ) );
 
-    TEST_ASSERT( 0 == mbedtls_cipher_set_iv( &ctx_dec, iv, 16 ) );
+    TEST_ASSERT( 0 == mbedtls_cipher_set_iv( &ctx_dec, iv, iv_len ) );
 
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx_dec ) );
 
@@ -1003,7 +1010,8 @@
     (void) pad_mode;
 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
 
-    if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
+    if( cipher_info->type == MBEDTLS_CIPHER_CHACHA20 ||
+        cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
         iv_len = 12;
     else
         iv_len = sizeof(iv);