diff --git a/tests/suites/test_suite_oid.data b/tests/suites/test_suite_oid.data
index 759a010..625085f 100644
--- a/tests/suites/test_suite_oid.data
+++ b/tests/suites/test_suite_oid.data
@@ -6,3 +6,30 @@
 
 OID get certificate policy wrong oid - id-ce-authorityKeyIdentifier
 oid_get_certificate_policies:"551D23":""
+
+OID get Ext Key Usage - id-kp-serverAuth
+oid_get_extended_key_usage:"2B06010505070301":"TLS Web Server Authentication"
+
+OID get Ext Key Usage - id-kp-clientAuth
+oid_get_extended_key_usage:"2B06010505070302":"TLS Web Client Authentication"
+
+OID get Ext Key Usage - id-kp-codeSigning
+oid_get_extended_key_usage:"2B06010505070303":"Code Signing"
+
+OID get Ext Key Usage - id-kp-emailProtection
+oid_get_extended_key_usage:"2B06010505070304":"E-mail Protection"
+
+OID get Ext Key Usage - id-kp-timeStamping
+oid_get_extended_key_usage:"2B06010505070308":"Time Stamping"
+
+OID get Ext Key Usage - id-kp-OCSPSigning
+oid_get_extended_key_usage:"2B06010505070309":"OCSP Signing"
+
+OID get Ext Key Usage - id-kp-wisun-fan-device
+oid_get_extended_key_usage:"2B0601040182E42501":"Wi-SUN Alliance Field Area Network (FAN)"
+
+OID get Ext Key Usage invalid oid
+oid_get_extended_key_usage:"5533445566":""
+
+OID get Ext Key Usage wrong oid - id-ce-authorityKeyIdentifier
+oid_get_extended_key_usage:"551D23":""
diff --git a/tests/suites/test_suite_oid.function b/tests/suites/test_suite_oid.function
index e95e48d..59e700e 100644
--- a/tests/suites/test_suite_oid.function
+++ b/tests/suites/test_suite_oid.function
@@ -32,3 +32,26 @@
     }
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void oid_get_extended_key_usage( data_t *oid, char *result_str )
+{
+    mbedtls_asn1_buf asn1_buf = { 0, 0, NULL };
+    int ret;
+    const char *desc;
+
+    asn1_buf.tag = MBEDTLS_ASN1_OID;
+    asn1_buf.p = oid->x;
+    asn1_buf.len = oid->len;
+
+    ret = mbedtls_oid_get_extended_key_usage( &asn1_buf, &desc );
+    if( strlen( result_str ) == 0 )
+    {
+        TEST_ASSERT( ret == MBEDTLS_ERR_OID_NOT_FOUND );
+    }
+    else
+    {
+        TEST_ASSERT( strcmp( ( char * )desc, result_str ) == 0 );
+    }
+}
+/* END_CASE */