diff --git a/deps/ngtcp2/ngtcp2.gyp b/deps/ngtcp2/ngtcp2.gyp
index 3a9b066cfe..91e3a68bdd 100644
--- a/deps/ngtcp2/ngtcp2.gyp
+++ b/deps/ngtcp2/ngtcp2.gyp
@@ -266,8 +266,18 @@
         'HAVE_CONFIG_H',
         'WITH_EXAMPLE_OSSL',
         'EV_STANDALONE=1',
+        'HAVE_UNISTD_H',
+        'HAVE_ARPA_INET_H',
+        'HAVE_NETINET_IN_H',
+        'HAVE_NETINET_IP_H',
       ],
       'conditions': [
+        ['OS=="aix" or OS=="win"', {
+          # AIX does not support some of the networking features used in
+          # the test server. Windows also lacks the Unix-specific headers
+          # and system calls required by the ngtcp2 examples.
+          'type': 'none',  # Disable as executable on AIX and Windows
+        }],
         ['OS=="mac"', {
           'defines': [
             '__APPLE_USE_RFC_3542',
@@ -281,25 +291,6 @@
             'libraries': [ '-lsocket', '-lnsl' ],
           },
         }],
-        ['OS=="win"', {
-          'defines': [
-            'WIN32',
-            '_WINDOWS',
-          ],
-          'msvs_settings': {
-            'VCCLCompilerTool': {
-              'CompileAs': '1'
-            },
-          },
-        }],
-        ['OS!="win"', {
-          'defines': [
-            'HAVE_UNISTD_H',
-            'HAVE_ARPA_INET_H',
-            'HAVE_NETINET_IN_H',
-            'HAVE_NETINET_IP_H',
-          ],
-        }],
         [ 'OS=="linux" or OS=="openharmony"', {
           'link_settings': {
             'libraries': [ '-ldl', '-lrt' ],
@@ -333,8 +324,18 @@
         'HAVE_CONFIG_H',
         'WITH_EXAMPLE_OSSL',
         'EV_STANDALONE=1',
+        'HAVE_UNISTD_H',
+        'HAVE_ARPA_INET_H',
+        'HAVE_NETINET_IN_H',
+        'HAVE_NETINET_IP_H',
       ],
       'conditions': [
+        ['OS=="aix" or OS=="win"', {
+          # AIX does not support some of the networking features used in
+          # the test client. Windows also lacks the Unix-specific headers
+          # and system calls required by the ngtcp2 examples.
+          'type': 'none',  # Disable as executable on AIX and Windows
+        }],
         ['OS=="mac"', {
           'defines': [
             '__APPLE_USE_RFC_3542',
@@ -348,25 +349,6 @@
             'libraries': [ '-lsocket', '-lnsl' ],
           },
         }],
-        ['OS=="win"', {
-          'defines': [
-            'WIN32',
-            '_WINDOWS',
-          ],
-          'msvs_settings': {
-            'VCCLCompilerTool': {
-              'CompileAs': '1'
-            },
-          },
-        }],
-        ['OS!="win"', {
-          'defines': [
-            'HAVE_UNISTD_H',
-            'HAVE_ARPA_INET_H',
-            'HAVE_NETINET_IN_H',
-            'HAVE_NETINET_IP_H',
-          ],
-        }],
         [ 'OS=="linux" or OS=="openharmony"', {
           'link_settings': {
             'libraries': [ '-ldl', '-lrt' ],
diff --git a/test/common/quic/test-client.mjs b/test/common/quic/test-client.mjs
new file mode 100644
index 0000000000..1e450e99ed
--- /dev/null
+++ b/test/common/quic/test-client.mjs
@@ -0,0 +1,64 @@
+import { resolve } from 'node:path';
+import { spawn } from 'node:child_process';
+
+export default class QuicTestClient {
+  #pathToClient;
+  #runningProcess;
+
+  constructor() {
+    this.#pathToClient = resolve(process.execPath, '../ngtcp2_test_client');
+    console.log(this.#pathToClient);
+  }
+
+  help(options = { stdio: 'inherit' }) {
+    const { promise, resolve, reject } = Promise.withResolvers();
+    const proc = spawn(this.#pathToClient, ['--help'], options);
+    proc.on('error', reject);
+    proc.on('exit', (code, signal) => {
+      if (code === 0) {
+        resolve();
+      } else {
+        reject(new Error(`Process exited with code ${code} and signal ${signal}`));
+      }
+    });
+    return promise;
+  }
+
+  run(address, port, uri, options = { stdio: 'inherit' }) {
+    const { promise, resolve, reject } = Promise.withResolvers();
+    if (this.#runningProcess) {
+      reject(new Error('Server is already running'));
+      return promise;
+    }
+    const args = [
+      address,
+      port,
+      uri ?? '',
+    ];
+    this.#runningProcess = spawn(this.#pathToClient, args, options);
+    this.#runningProcess.on('error', (err) => {
+      this.#runningProcess = undefined;
+      reject(err);
+    });
+    this.#runningProcess.on('exit', (code, signal) => {
+      if (code === 0) {
+        resolve();
+      } else {
+        if (code === null && signal === 'SIGTERM') {
+          // Normal termination due to stop() being called.
+          resolve();
+          return;
+        }
+        reject(new Error(`Process exited with code ${code} and signal ${signal}`));
+      }
+    });
+    return promise;
+  }
+
+  stop() {
+    if (this.#runningProcess) {
+      this.#runningProcess.kill();
+      this.#runningProcess = undefined;
+    }
+  }
+};
diff --git a/test/common/quic/test-server.mjs b/test/common/quic/test-server.mjs
new file mode 100644
index 0000000000..5d0168ed23
--- /dev/null
+++ b/test/common/quic/test-server.mjs
@@ -0,0 +1,66 @@
+import { resolve } from 'node:path';
+import { spawn } from 'node:child_process';
+
+export default class QuicTestServer {
+  #pathToServer;
+  #runningProcess;
+
+  constructor() {
+    this.#pathToServer = resolve(process.execPath, '../ngtcp2_test_server');
+    console.log(this.#pathToServer);
+  }
+
+  help(options = { stdio: 'inherit' }) {
+    const { promise, resolve, reject } = Promise.withResolvers();
+    const proc = spawn(this.#pathToServer, ['--help'], options);
+    proc.on('error', reject);
+    proc.on('exit', (code, signal) => {
+      if (code === 0) {
+        resolve();
+      } else {
+        reject(new Error(`Process exited with code ${code} and signal ${signal}`));
+      }
+    });
+    return promise;
+  }
+
+  run(address, port, keyFile, certFile, options = { stdio: 'inherit' }) {
+    const { promise, resolve, reject } = Promise.withResolvers();
+    if (this.#runningProcess) {
+      reject(new Error('Server is already running'));
+      return promise;
+    }
+    const args = [
+      address,
+      port,
+      keyFile,
+      certFile,
+    ];
+    this.#runningProcess = spawn(this.#pathToServer, args, options);
+    this.#runningProcess.on('error', (err) => {
+      this.#runningProcess = undefined;
+      reject(err);
+    });
+    this.#runningProcess.on('exit', (code, signal) => {
+      this.#runningProcess = undefined;
+      if (code === 0) {
+        resolve();
+      } else {
+        if (code === null && signal === 'SIGTERM') {
+          // Normal termination due to stop() being called.
+          resolve();
+          return;
+        }
+        reject(new Error(`Process exited with code ${code} and signal ${signal}`));
+      }
+    });
+    return promise;
+  }
+
+  stop() {
+    if (this.#runningProcess) {
+      this.#runningProcess.kill();
+      this.#runningProcess = undefined;
+    }
+  }
+};
diff --git a/test/parallel/test-quic-test-client.mjs b/test/parallel/test-quic-test-client.mjs
new file mode 100644
index 0000000000..921001e84d
--- /dev/null
+++ b/test/parallel/test-quic-test-client.mjs
@@ -0,0 +1,32 @@
+// Flags: --experimental-quic
+import { hasQuic, isAIX, isWindows, skip } from '../common/index.mjs';
+import { rejects } from 'node:assert';
+
+if (!hasQuic) {
+  skip('QUIC support is not enabled');
+}
+if (isAIX) {
+  // AIX does not support some of the networking features used in the ngtcp2
+  // example server and client.
+  skip('QUIC third-party tests are disabled on AIX');
+}
+if (isWindows) {
+  // Windows does not support the [Li/U]nix specific headers and system calls
+  // required by the ngtcp2 example server/client.
+  skip('QUIC third-party tests are disabled on Windows');
+}
+
+const { default: QuicTestClient } = await import('../common/quic/test-client.mjs');
+
+const client = new QuicTestClient();
+
+// If this completes without throwing, the test passes.
+await client.help({ stdio: 'ignore' });
+
+setTimeout(() => {
+  client.stop();
+}, 100);
+
+// We expect this to fail since there's no server running.
+await rejects(client.run('localhost', '12345', undefined, { stdio: 'ignore' }),
+              { message: /Process exited with code 1 and signal null/ });
diff --git a/test/parallel/test-quic-test-server.mjs b/test/parallel/test-quic-test-server.mjs
new file mode 100644
index 0000000000..0951984b2a
--- /dev/null
+++ b/test/parallel/test-quic-test-server.mjs
@@ -0,0 +1,34 @@
+// Flags: --experimental-quic
+import { hasQuic, isAIX, isWindows, skip } from '../common/index.mjs';
+
+if (!hasQuic) {
+  skip('QUIC support is not enabled');
+}
+if (isAIX) {
+  // AIX does not support some of the networking features used in the ngtcp2
+  // example server and client.
+  skip('QUIC third-party tests are disabled on AIX');
+}
+if (isWindows) {
+  // Windows does not support the [Li/U]nix specific headers and system calls
+  // required by the ngtcp2 example server/client.
+  skip('QUIC third-party tests are disabled on Windows');
+}
+
+const { default: QuicTestServer } = await import('../common/quic/test-server.mjs');
+const fixtures = await import('../common/fixtures.mjs');
+
+const server = new QuicTestServer();
+const fixturesPath = fixtures.path();
+
+// If this completes without throwing, the test passes.
+await server.help({ stdio: 'ignore' });
+
+setTimeout(() => {
+  server.stop();
+}, 100);
+
+await server.run('localhost', '12345',
+                 `${fixturesPath}/keys/agent1-key.pem`,
+                 `${fixturesPath}/keys/agent1-cert.pem`,
+                 { stdio: 'inherit' });