fix: Adds ReplSet shutdown to tests

Based on advice from @hasezoey, this adds a shutdown step to the after()
cleanup to ensure all temp files are removed as part of the test
completion step.

ref: typegoose/mongodb-memory-server#666 (comment)

test/e2e.spec.ts

@@ -22,6 +22,11 @@ test.before(async (t) => {
   t.context.mongo = rs;
 });
 
+// shut down replset after test
+test.after(async (t) => {
+  await t.context.mongo.stop();
+});
+
 test("Sanity - Can connect to local mongo", async (t) => {
   const client = new MongoClient(t.context.mongo.getUri());
   await client.connect();
@@ -45,7 +50,7 @@ test("Creates a queue, adds an item, and sees the result in a processor", async
         resolve();
       },
       {
-        pollIntervalMs: 1,
+        pollInterval: 0.1,
       }
     );
   });

test/oplog.spec.ts

@@ -21,6 +21,11 @@ test.before(async (t) => {
   t.context.mongo = rs;
 });
 
+// shut down replset after test
+test.after(async (t) => {
+  await t.context.mongo.stop();
+});
+
 // Makes sure the oplog is used to minimize polling load
 // all other times, we'll a 1ms poll to move through tests as fast as possible
 test("Leverages the oplog to minimize polling", async (t) => {
@@ -36,7 +41,7 @@ test("Leverages the oplog to minimize polling", async (t) => {
       },
       {
         concurrency: 1,
-        pollIntervalMs: 40000,
+        pollInterval: 40,
       }
     );
   });
@@ -65,7 +70,7 @@ test("Won't run without a replica set", async (t) => {
         resolve();
       },
       {
-        pollIntervalMs: 1,
+        pollInterval: 0.1,
       }
     );
     queue.events.on("error", (err) => {