Add a test of the OID->MD map functions
diff --git a/tests/suites/test_suite_oid.function b/tests/suites/test_suite_oid.function
index cb8abe6..065295a 100644
--- a/tests/suites/test_suite_oid.function
+++ b/tests/suites/test_suite_oid.function
@@ -78,3 +78,29 @@
     }
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void oid_get_md_alg_id( data_t *oid, int exp_md_id )
+{
+    mbedtls_asn1_buf md_oid = { 0, 0, NULL };
+    int ret;
+    mbedtls_md_type_t md_id = 0;
+
+    md_oid.tag = MBEDTLS_ASN1_OID;
+    md_oid.p = oid->x;
+    md_oid.len = oid->len;
+
+    ret = mbedtls_oid_get_md_alg( &md_oid, &md_id );
+
+    if( exp_md_id < 0 )
+    {
+        TEST_ASSERT( ret == MBEDTLS_ERR_OID_NOT_FOUND );
+        TEST_ASSERT( md_id == 0);
+    }
+    else
+    {
+        TEST_ASSERT( ret == 0 );
+        TEST_ASSERT( (mbedtls_md_type_t)exp_md_id == md_id );
+    }
+}
+/* END_CASE */