diff --git a/kernel_liteos_a-master/testsuites/unittest/net/netdb/smoke/net_netdb_test_001.cpp b/kernel_liteos_a-master/testsuites/unittest/net/netdb/smoke/net_netdb_test_001.cpp
new file mode 100644
index 0000000..1e0b53a
--- /dev/null
+++ b/kernel_liteos_a-master/testsuites/unittest/net/netdb/smoke/net_netdb_test_001.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ * of conditions and the following disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "lt_net_netdb.h"
+
+static int ProtoentTest(void)
+{
+    setprotoent(1);
+
+    // refer to the `/etc/protocols' file.
+    struct protoent *prot = getprotobyname("icmp");
+    ICUNIT_ASSERT_NOT_EQUAL(prot, NULL, -1);
+    ICUNIT_ASSERT_EQUAL(prot->p_proto, 1, prot->p_proto);
+
+    prot = getprotobynumber(1);
+    ICUNIT_ASSERT_NOT_EQUAL(prot, NULL, -1);
+    ICUNIT_ASSERT_EQUAL(strcmp(prot->p_name, "icmp"), 0, -1);
+
+    prot = getprotoent();
+    ICUNIT_ASSERT_NOT_EQUAL(prot, NULL, -1);
+
+    endprotoent();
+    return ICUNIT_SUCCESS;
+}
+
+void NetNetDbTest001(void)
+{
+    TEST_ADD_CASE(__FUNCTION__, ProtoentTest, TEST_POSIX, TEST_TCP, TEST_LEVEL0, TEST_FUNCTION);
+}
diff --git a/kernel_liteos_a-master/testsuites/unittest/net/netdb/smoke/net_netdb_test_013.cpp b/kernel_liteos_a-master/testsuites/unittest/net/netdb/smoke/net_netdb_test_013.cpp
new file mode 100644
index 0000000..b713849
--- /dev/null
+++ b/kernel_liteos_a-master/testsuites/unittest/net/netdb/smoke/net_netdb_test_013.cpp
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ * of conditions and the following disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "lt_net_netdb.h"
+
+static int HerrorTest(void)
+{
+    const char *err = hstrerror(TRY_AGAIN);
+    ICUNIT_ASSERT_NOT_EQUAL(err, NULL, -1);
+
+    herror(err);
+
+    return ICUNIT_SUCCESS;
+}
+
+void NetNetDbTest013(void)
+{
+    TEST_ADD_CASE(__FUNCTION__, HerrorTest, TEST_POSIX, TEST_TCP, TEST_LEVEL0, TEST_FUNCTION);
+}