diff --git a/tests/suites/test_suite_oid.data b/tests/suites/test_suite_oid.data
index 1738841..18b019a 100644
--- a/tests/suites/test_suite_oid.data
+++ b/tests/suites/test_suite_oid.data
@@ -89,3 +89,27 @@
 OID hash id - invalid oid
 oid_get_md_alg_id:"2B864886f70d0204":-1
 
+OID get numeric string - hardware module name
+oid_get_numeric_string:"2B06010505070804":0:"1.3.6.1.5.5.7.8.4"
+
+OID get numeric string - multi-byte subidentifier
+oid_get_numeric_string:"29903C":0:"1.1.2108"
+
+OID get numeric string - second component greater than 39
+oid_get_numeric_string:"81010000863A00":0:"2.49.0.0.826.0"
+
+OID get numeric string - multi-byte first subidentifier
+oid_get_numeric_string:"8837":0:"2.999"
+
+OID get numeric string - empty oid buffer
+oid_get_numeric_string:"":MBEDTLS_ERR_OID_BUF_TOO_SMALL:""
+
+OID get numeric string - no final / all bytes have top bit set
+oid_get_numeric_string:"818181":MBEDTLS_ERR_OID_BUF_TOO_SMALL:""
+
+# Encodes the number 0x0400000000 as a subidentifier which overflows 32-bits
+OID get numeric string - 32-bit overflow
+oid_get_numeric_string:"C080808000":MBEDTLS_ERR_OID_BUF_TOO_SMALL:""
+
+OID get numeric string - 32-bit overflow, second subidentifier
+oid_get_numeric_string:"2BC080808000":MBEDTLS_ERR_OID_BUF_TOO_SMALL:""
diff --git a/tests/suites/test_suite_oid.function b/tests/suites/test_suite_oid.function
index 687b216..3004b65 100644
--- a/tests/suites/test_suite_oid.function
+++ b/tests/suites/test_suite_oid.function
@@ -96,3 +96,24 @@
     }
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void oid_get_numeric_string(data_t *oid, int error_ret, char *result_str)
+{
+    char buf[256];
+    mbedtls_asn1_buf input_oid = { 0, 0, NULL };
+    int ret;
+
+    input_oid.tag = MBEDTLS_ASN1_OID;
+    input_oid.p = oid->x;
+    input_oid.len = oid->len;
+
+    ret = mbedtls_oid_get_numeric_string(buf, sizeof(buf), &input_oid);
+
+    if (error_ret == 0) {
+        TEST_ASSERT(strcmp(buf, result_str) == 0);
+    } else {
+        TEST_EQUAL(ret, error_ret);
+    }
+}
+/* END_CASE */