tests: start adding quic test server utilities

Author: jasnell

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;
+    }
+  }
+};

test/parallel/test-quic-test-server.mjs

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+import { default as QuicTestServer } from '../common/quic/test-server.mjs';
+import * as fixtures from '../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' });