diff --git a/tests/suites/test_suite_oid.data b/tests/suites/test_suite_oid.data
index 9e47ef4..d4a7dea 100644
--- a/tests/suites/test_suite_oid.data
+++ b/tests/suites/test_suite_oid.data
@@ -131,3 +131,30 @@
 
 OID from numeric string - multi-byte first subidentifier
 oid_from_numeric_string:"2.999":0:"8837"
+
+OID from numeric string - empty string input
+oid_from_numeric_string:"":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - first component not a number
+oid_from_numeric_string:"abc.1.2":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - second component not a number
+oid_from_numeric_string:"1.abc.2":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - first component too large
+oid_from_numeric_string:"3.1":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - first component < 2, second > 39
+oid_from_numeric_string:"1.40":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - third component not a number
+oid_from_numeric_string:"1.2.abc":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - non-'.' separator between first and second
+oid_from_numeric_string:"1/2.3.4":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - non-'.' separator between second and third
+oid_from_numeric_string:"1.2/3.4":MBEDTLS_ERR_ASN1_INVALID_DATA:""
+
+OID from numeric string - non-'.' separator between third and fourth
+oid_from_numeric_string:"1.2.3/4":MBEDTLS_ERR_ASN1_INVALID_DATA:""