test: add basic test for reinit of a single repl set

Author: Jonas Strassel

packages/mongodb-memory-server-core/src/__tests__/replset-single-restart-test.ts

@@ -0,0 +1,47 @@
+import MongoMemoryReplSet from '../MongoMemoryReplSet';
+import * as tmp from 'tmp';
+
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 600000;
+
+let tmpDir: tmp.DirResult;
+beforeEach(() => {
+  tmpDir = tmp.dirSync({ prefix: 'reuse-mongo-mem-', unsafeCleanup: true });
+});
+
+afterEach(() => {
+  tmpDir.removeCallback();
+});
+
+const sleep = (ms: number) => {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+};
+
+describe('single-member replica set', () => {
+  it('should start multiple times', async () => {
+    const opts: any = {
+      replSet: {
+        storageEngine: 'wiredTiger',
+      },
+      instanceOpts: [
+        {
+          port: 27017,
+          dbPath: tmpDir.name,
+        },
+      ],
+    };
+
+    const replSetBefore = new MongoMemoryReplSet(opts);
+    await replSetBefore.waitUntilRunning();
+    await replSetBefore.stop();
+    /**
+     * get-port has a portlocking-feature that keeps ports locked for
+     * "a minimum of 15 seconds and a maximum of 30 seconds before being released again"
+     * https://github.com/sindresorhus/get-port#beware
+     */
+    await sleep(30000);
+
+    const replSetAfter = new MongoMemoryReplSet(opts);
+    await replSetAfter.waitUntilRunning();
+    await replSetAfter.stop();
+  });
+});