diff --git a/tests/cts/net/native/dns_async/Android.bp b/tests/cts/net/native/dns/Android.bp
similarity index 76%
rename from tests/cts/net/native/dns_async/Android.bp
rename to tests/cts/net/native/dns/Android.bp
index 2b9346fc0b..9fbc3fc83d 100644
--- a/tests/cts/net/native/dns_async/Android.bp
+++ b/tests/cts/net/native/dns/Android.bp
@@ -7,15 +7,18 @@ cc_defaults {
         "-Wall",
         "-Wextra",
         "-Werror",
-        "-fno-builtin",
+        "-Wnullable-to-nonnull-conversion",
+        "-Wsign-compare",
+        "-Wthread-safety",
+        "-Wunused-parameter",
     ],
     srcs: [
-        "src/NativeDnsAsyncTest.cpp",
+        "NativeDnsAsyncTest.cpp",
     ],
     shared_libs: [
+        "libandroid",
         "liblog",
         "libutils",
-        "libandroid",
     ],
 }
 
diff --git a/tests/cts/net/native/dns_async/AndroidTest.xml b/tests/cts/net/native/dns/AndroidTest.xml
similarity index 94%
rename from tests/cts/net/native/dns_async/AndroidTest.xml
rename to tests/cts/net/native/dns/AndroidTest.xml
index e092b36186..e63c6789a5 100644
--- a/tests/cts/net/native/dns_async/AndroidTest.xml
+++ b/tests/cts/net/native/dns/AndroidTest.xml
@@ -13,7 +13,7 @@
      See the License for the specific language governing permissions and
      limitations under the License.
 -->
-<configuration description="Config for CTS Native Network dns_async test cases">
+<configuration description="Config for CTS Native Network dns test cases">
     <option name="test-suite-tag" value="cts" />
     <option name="config-descriptor:metadata" key="component" value="networking" />
     <target_preparer class="com.android.compatibility.common.tradefed.targetprep.FilePusher">
diff --git a/tests/cts/net/native/dns/NativeDnsAsyncTest.cpp b/tests/cts/net/native/dns/NativeDnsAsyncTest.cpp
new file mode 100644
index 0000000000..6ce89a041f
--- /dev/null
+++ b/tests/cts/net/native/dns/NativeDnsAsyncTest.cpp
@@ -0,0 +1,255 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <error.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <netinet/in.h>
+#include <poll.h> /* poll */
+#include <resolv.h>
+#include <string.h>
+#include <sys/socket.h>
+
+#include <android/multinetwork.h>
+#include <gtest/gtest.h>
+
+namespace {
+constexpr int MAXPACKET = 8 * 1024;
+constexpr int PTON_MAX = 16;
+constexpr int TIMEOUT_MS = 10000;
+
+int getAsyncResponse(int fd, int timeoutMs, int* rcode, uint8_t* buf, size_t bufLen) {
+    struct pollfd wait_fd[1];
+    wait_fd[0].fd = fd;
+    wait_fd[0].events = POLLIN;
+    short revents;
+    int ret;
+    ret = poll(wait_fd, 1, timeoutMs);
+    revents = wait_fd[0].revents;
+    if (revents & POLLIN) {
+        int n = android_res_nresult(fd, rcode, buf, bufLen);
+        return n;
+    }
+
+    return -1;
+}
+
+std::vector<std::string> extractIpAddressAnswers(uint8_t* buf, size_t bufLen, int ipType) {
+    ns_msg handle;
+    if (ns_initparse((const uint8_t*) buf, bufLen, &handle) < 0) {
+        return {};
+    }
+    const int ancount = ns_msg_count(handle, ns_s_an);
+    ns_rr rr;
+    std::vector<std::string> answers;
+    for (int i = 0; i < ancount; i++) {
+        if (ns_parserr(&handle, ns_s_an, i, &rr) < 0) {
+            continue;
+        }
+        const uint8_t* rdata = ns_rr_rdata(rr);
+        char buffer[INET6_ADDRSTRLEN];
+        if (inet_ntop(ipType, (const char*) rdata, buffer, sizeof(buffer))) {
+            answers.push_back(buffer);
+        }
+    }
+    return answers;
+}
+
+void expectAnswersValid(int fd, int ipType, int expectedRcode) {
+    int rcode = -1;
+    uint8_t buf[MAXPACKET] = {};
+    int res = getAsyncResponse(fd, TIMEOUT_MS, &rcode, buf, MAXPACKET);
+    EXPECT_GE(res, 0);
+    EXPECT_EQ(rcode, expectedRcode);
+
+
+    if (expectedRcode == ns_r_noerror) {
+        auto answers = extractIpAddressAnswers(buf, res, ipType);
+        EXPECT_GE(answers.size(), 0U);
+        for (auto &answer : answers) {
+            char pton[PTON_MAX];
+            EXPECT_EQ(1, inet_pton(ipType, answer.c_str(), pton));
+        }
+    }
+}
+
+void expectAnswersNotValid(int fd, int expectedErrno) {
+    int rcode = -1;
+    uint8_t buf[MAXPACKET] = {};
+    int res = getAsyncResponse(fd, TIMEOUT_MS, &rcode, buf, MAXPACKET);
+    EXPECT_EQ(expectedErrno, res);
+}
+
+} // namespace
+
+TEST (NativeDnsAsyncTest, Async_Query) {
+    // V4
+    int fd1 = android_res_nquery(
+            NETWORK_UNSPECIFIED, "www.google.com", ns_c_in, ns_t_a, ResNsendFlags(0));
+    EXPECT_GE(fd1, 0);
+    int fd2 = android_res_nquery(
+            NETWORK_UNSPECIFIED, "www.youtube.com", ns_c_in, ns_t_a, ResNsendFlags(0));
+    EXPECT_GE(fd2, 0);
+    expectAnswersValid(fd2, AF_INET, ns_r_noerror);
+    expectAnswersValid(fd1, AF_INET, ns_r_noerror);
+
+    // V6
+    fd1 = android_res_nquery(
+            NETWORK_UNSPECIFIED, "www.google.com", ns_c_in, ns_t_aaaa, ResNsendFlags(0));
+    EXPECT_GE(fd1, 0);
+    fd2 = android_res_nquery(
+            NETWORK_UNSPECIFIED, "www.youtube.com", ns_c_in, ns_t_aaaa, ResNsendFlags(0));
+    EXPECT_GE(fd2, 0);
+    expectAnswersValid(fd2, AF_INET6, ns_r_noerror);
+    expectAnswersValid(fd1, AF_INET6, ns_r_noerror);
+}
+
+TEST (NativeDnsAsyncTest, Async_Send) {
+    // V4
+    uint8_t buf1[MAXPACKET] = {};
+    int len1 = res_mkquery(ns_o_query, "www.googleapis.com",
+            ns_c_in, ns_t_a, nullptr, 0, nullptr, buf1, sizeof(buf1));
+    EXPECT_GT(len1, 0);
+
+    uint8_t buf2[MAXPACKET] = {};
+    int len2 = res_mkquery(ns_o_query, "play.googleapis.com",
+            ns_c_in, ns_t_a, nullptr, 0, nullptr, buf2, sizeof(buf2));
+    EXPECT_GT(len2, 0);
+
+    int fd1 = android_res_nsend(NETWORK_UNSPECIFIED, buf1, len1, ResNsendFlags(0));
+    EXPECT_GE(fd1, 0);
+    int fd2 = android_res_nsend(NETWORK_UNSPECIFIED, buf2, len2, ResNsendFlags(0));
+    EXPECT_GE(fd2, 0);
+
+    expectAnswersValid(fd2, AF_INET, ns_r_noerror);
+    expectAnswersValid(fd1, AF_INET, ns_r_noerror);
+
+    // V6
+    memset(buf1, 0, sizeof(buf1));
+    memset(buf2, 0, sizeof(buf2));
+    len1 = res_mkquery(ns_o_query, "www.googleapis.com",
+            ns_c_in, ns_t_aaaa, nullptr, 0, nullptr, buf1, sizeof(buf1));
+    EXPECT_GT(len1, 0);
+    len2 = res_mkquery(ns_o_query, "play.googleapis.com",
+            ns_c_in, ns_t_aaaa, nullptr, 0, nullptr, buf2, sizeof(buf2));
+    EXPECT_GT(len2, 0);
+
+    fd1 = android_res_nsend(NETWORK_UNSPECIFIED, buf1, len1, ResNsendFlags(0));
+    EXPECT_GE(fd1, 0);
+    fd2 = android_res_nsend(NETWORK_UNSPECIFIED, buf2, len2, ResNsendFlags(0));
+    EXPECT_GE(fd2, 0);
+
+    expectAnswersValid(fd2, AF_INET6, ns_r_noerror);
+    expectAnswersValid(fd1, AF_INET6, ns_r_noerror);
+}
+
+TEST (NativeDnsAsyncTest, Async_NXDOMAIN) {
+    uint8_t buf[MAXPACKET] = {};
+    int len = res_mkquery(ns_o_query, "test1-nx.metric.gstatic.com",
+            ns_c_in, ns_t_a, nullptr, 0, nullptr, buf, sizeof(buf));
+    EXPECT_GT(len, 0);
+    int fd1 = android_res_nsend(NETWORK_UNSPECIFIED, buf, len, ANDROID_RESOLV_NO_CACHE_LOOKUP);
+    EXPECT_GE(fd1, 0);
+
+    len = res_mkquery(ns_o_query, "test2-nx.metric.gstatic.com",
+            ns_c_in, ns_t_a, nullptr, 0, nullptr, buf, sizeof(buf));
+    EXPECT_GT(len, 0);
+    int fd2 = android_res_nsend(NETWORK_UNSPECIFIED, buf, len, ANDROID_RESOLV_NO_CACHE_LOOKUP);
+    EXPECT_GE(fd2, 0);
+
+    expectAnswersValid(fd2, AF_INET, ns_r_nxdomain);
+    expectAnswersValid(fd1, AF_INET, ns_r_nxdomain);
+
+    fd1 = android_res_nquery(
+            NETWORK_UNSPECIFIED, "test3-nx.metric.gstatic.com",
+            ns_c_in, ns_t_aaaa, ANDROID_RESOLV_NO_CACHE_LOOKUP);
+    EXPECT_GE(fd1, 0);
+    fd2 = android_res_nquery(
+            NETWORK_UNSPECIFIED, "test4-nx.metric.gstatic.com",
+            ns_c_in, ns_t_aaaa, ANDROID_RESOLV_NO_CACHE_LOOKUP);
+    EXPECT_GE(fd2, 0);
+    expectAnswersValid(fd2, AF_INET6, ns_r_nxdomain);
+    expectAnswersValid(fd1, AF_INET6, ns_r_nxdomain);
+}
+
+TEST (NativeDnsAsyncTest, Async_Cancel) {
+    int fd = android_res_nquery(
+            NETWORK_UNSPECIFIED, "www.google.com", ns_c_in, ns_t_a, ResNsendFlags(0));
+    int rcode = -1;
+    uint8_t buf[MAXPACKET] = {};
+    android_res_cancel(fd);
+    android_res_cancel(fd);
+
+    int res = android_res_nresult(fd, &rcode, buf, MAXPACKET);
+    EXPECT_EQ(-EBADF, res);
+}
+
+TEST (NativeDnsAsyncTest, Async_Query_MALFORMED) {
+    // Empty string to create BLOB and query, we will get empty result and rcode = 0
+    // on DNSTLS.
+    int fd = android_res_nquery(
+            NETWORK_UNSPECIFIED, "", ns_c_in, ns_t_a, ResNsendFlags(0));
+    EXPECT_GE(fd, 0);
+    expectAnswersValid(fd, AF_INET, ns_r_noerror);
+
+    std::string exceedingLabelQuery = "www." + std::string(70, 'g') + ".com";
+    std::string exceedingDomainQuery = "www." + std::string(255, 'g') + ".com";
+
+    fd = android_res_nquery(NETWORK_UNSPECIFIED,
+            exceedingLabelQuery.c_str(), ns_c_in, ns_t_a, ResNsendFlags(0));
+    EXPECT_EQ(-EMSGSIZE, fd);
+    fd = android_res_nquery(NETWORK_UNSPECIFIED,
+            exceedingDomainQuery.c_str(), ns_c_in, ns_t_a, ResNsendFlags(0));
+    EXPECT_EQ(-EMSGSIZE, fd);
+}
+
+TEST (NativeDnsAsyncTest, Async_Send_MALFORMED) {
+    uint8_t buf[10] = {};
+    // empty BLOB
+    int fd = android_res_nsend(NETWORK_UNSPECIFIED, buf, 10, ResNsendFlags(0));
+    EXPECT_GE(fd, 0);
+    expectAnswersNotValid(fd, -EINVAL);
+
+    std::vector<uint8_t> largeBuf(2 * MAXPACKET, 0);
+    // A buffer larger than 8KB
+    fd = android_res_nsend(
+            NETWORK_UNSPECIFIED, largeBuf.data(), largeBuf.size(), ResNsendFlags(0));
+    EXPECT_EQ(-EMSGSIZE, fd);
+
+    // 1000 bytes filled with 0. This returns EMSGSIZE because FrameworkListener limits the size of
+    // commands to 1024 bytes. TODO: fix this.
+    fd = android_res_nsend(NETWORK_UNSPECIFIED, largeBuf.data(), 1000, ResNsendFlags(0));
+    EXPECT_EQ(-EMSGSIZE, fd);
+
+    // 500 bytes filled with 0
+    fd = android_res_nsend(NETWORK_UNSPECIFIED, largeBuf.data(), 500, ResNsendFlags(0));
+    EXPECT_GE(fd, 0);
+    expectAnswersNotValid(fd, -EINVAL);
+
+    // 1000 bytes filled with 0xFF
+    std::vector<uint8_t> ffBuf(1000, 255);
+    fd = android_res_nsend(
+            NETWORK_UNSPECIFIED, ffBuf.data(), ffBuf.size(), ResNsendFlags(0));
+    EXPECT_EQ(-EMSGSIZE, fd);
+
+    // 500 bytes filled with 0xFF
+    fd = android_res_nsend(NETWORK_UNSPECIFIED, ffBuf.data(), 500, ResNsendFlags(0));
+    EXPECT_GE(fd, 0);
+    expectAnswersNotValid(fd, -EINVAL);
+}
\ No newline at end of file
diff --git a/tests/cts/net/native/dns_async/src/NativeDnsAsyncTest.cpp b/tests/cts/net/native/dns_async/src/NativeDnsAsyncTest.cpp
deleted file mode 100644
index 087eb5ed5a..0000000000
--- a/tests/cts/net/native/dns_async/src/NativeDnsAsyncTest.cpp
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * Copyright (C) 2018 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <arpa/inet.h>
-#include <arpa/nameser.h>
-#include <netinet/in.h>
-#include <sys/socket.h>
-#include <error.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <poll.h> /* poll */
-#include <resolv.h>
-#include <string.h>
-
-#include <android/multinetwork.h>
-#include <gtest/gtest.h>
-
-namespace {
-constexpr int MAXPACKET = 8 * 1024;
-constexpr int PTON_MAX = 16;
-
-int getAsyncResponse(int fd, int timeoutMs, int* rcode, u_char* buf, int bufLen) {
-    struct pollfd wait_fd[1];
-    wait_fd[0].fd = fd;
-    wait_fd[0].events = POLLIN;
-    short revents;
-    int ret;
-    ret = poll(wait_fd, 1, timeoutMs);
-    revents = wait_fd[0].revents;
-    if (revents & POLLIN) {
-        int n = android_res_nresult(fd, rcode, buf, bufLen);
-        return n;
-    }
-
-    return -1;
-}
-
-std::vector<std::string> extractIpAddressAnswers(u_char* buf, int bufLen, int ipType) {
-    ns_msg handle;
-    if (ns_initparse((const uint8_t*) buf, bufLen, &handle) < 0) {
-        return {};
-    }
-    int ancount = ns_msg_count(handle, ns_s_an);
-    ns_rr rr;
-    std::vector<std::string> answers;
-    for (int i = 0; i < ancount; i++) {
-        if (ns_parserr(&handle, ns_s_an, i, &rr) < 0) {
-            continue;
-        }
-        const u_char* rdata = ns_rr_rdata(rr);
-        char buffer[INET6_ADDRSTRLEN];
-        if (inet_ntop(ipType, (const char*) rdata, buffer, sizeof(buffer))) {
-            answers.push_back(buffer);
-        }
-    }
-    return answers;
-}
-
-void expectAnswersValid(int fd, int ipType, int expectedRcode) {
-    int rcode = -1;
-    u_char buf[MAXPACKET] = {};
-    int res = getAsyncResponse(fd, 10000, &rcode, buf, MAXPACKET);
-    EXPECT_GT(res, 0);
-    EXPECT_EQ(rcode, expectedRcode);
-
-
-    if (expectedRcode == NOERROR) {
-        auto answers = extractIpAddressAnswers(buf, res, ipType);
-        EXPECT_GT(answers.size(), 0U);
-        for (auto &answer : answers) {
-            char pton[PTON_MAX];
-            EXPECT_EQ(1, inet_pton(ipType, answer.c_str(), pton));
-        }
-    }
-}
-
-} // namespace
-
-TEST (NativeDnsAsyncTest, Async_Query) {
-    // V4
-    int fd = android_res_nquery(NETWORK_UNSPECIFIED ,"www.google.com", ns_c_in, ns_t_a);
-    EXPECT_GT(fd, 0);
-    expectAnswersValid(fd, AF_INET, NOERROR);
-
-    // V6
-    fd = android_res_nquery(NETWORK_UNSPECIFIED ,"www.google.com", ns_c_in, ns_t_aaaa);
-    EXPECT_GT(fd, 0);
-    expectAnswersValid(fd, AF_INET6, NOERROR);
-}
-
-TEST (NativeDnsAsyncTest, Async_Send) {
-    // V4
-    u_char buf[MAXPACKET] = {};
-    int len = res_mkquery(QUERY, "www.youtube.com",
-            ns_c_in, ns_t_a, nullptr, 0, nullptr, buf, sizeof(buf));
-    EXPECT_GT(len, 0);
-    int fd = android_res_nsend(NETWORK_UNSPECIFIED , buf, len);
-    EXPECT_GT(fd, 0);
-    expectAnswersValid(fd, AF_INET, NOERROR);
-
-    // V6
-    memset(buf, 0, MAXPACKET);
-    len = res_mkquery(QUERY, "www.youtube.com",
-            ns_c_in, ns_t_aaaa, nullptr, 0, nullptr, buf, sizeof(buf));
-    EXPECT_GT(len, 0);
-    fd = android_res_nsend(NETWORK_UNSPECIFIED , buf, len);
-    EXPECT_GT(fd, 0);
-    expectAnswersValid(fd, AF_INET6, NOERROR);
-}
-
-TEST (NativeDnsAsyncTest, Async_NXDOMAIN) {
-    u_char buf[MAXPACKET] = {};
-    int len = res_mkquery(QUERY, "test-nx.metric.gstatic.com",
-            ns_c_in, ns_t_a, nullptr, 0, nullptr, buf, sizeof(buf));
-    EXPECT_GT(len, 0);
-    int fd = android_res_nsend(NETWORK_UNSPECIFIED , buf, len);
-    EXPECT_GT(fd, 0);
-    expectAnswersValid(fd, AF_INET, NXDOMAIN);
-}
-
-TEST (NativeDnsAsyncTest, Async_Cancel) {
-    int fd = android_res_nquery(NETWORK_UNSPECIFIED ,"www.google.com", ns_c_in, ns_t_a);
-    int rcode = -1;
-    u_char buf[MAXPACKET] = {};
-    android_res_cancel(fd);
-
-    int res = android_res_nresult(fd, &rcode, buf, MAXPACKET);
-    EXPECT_EQ(res, -EBADF);
-}
-
-int main(int argc, char **argv) {
-    testing::InitGoogleTest(&argc, argv);
-    return RUN_ALL_TESTS();
-}